chore(release): 0.16.0 — drag-select with auto-scroll · /copy retired

feat(ui): plain mouse drag in the log now paints a reverse-video
selection, dragging past the viewport edge auto-scrolls the log, and
releasing copies the selected text to the system clipboard via OSC 52
+ tempfile fallback. Shift+drag still bypasses tracking for native
terminal selection.

chore(ui): the old /copy slash command, copyMode lifecycle, and
mouse-tracking helpers are gone — the new flow stays inside
alt-screen so there's no main-buffer dump to manage.

.gitattributes

@@ -0,0 +1,11 @@
+# Force LF line endings on every checkout, regardless of platform.
+# Biome's formatter is strict about CRLF — without this, a Windows clone
+# with autocrlf=true will land with CRLF in the working tree even though
+# the repo stores LF, and `npm run lint` (and prepublishOnly with it)
+# fails. See docs/style.md if you ever add binary types here.
+* text=auto eol=lf
+
+# Lockfiles + the codemirror bundle are generated; treat them as
+# auto-detected text but never coerce.
+package-lock.json text eol=lf
+dashboard/codemirror.js text eol=lf

.gitignore

@@ -24,3 +24,12 @@ sessions/
 .turbo/
 # Local-only Claude Code settings — personal overrides, never committed.
 .claude/settings.local.json
+# Per-user Reasonix state under .reasonix/ — committable team-level
+# files (settings.json, skills/) stay tracked, but the user-private
+# bits (semantic index, sessions, opt-out markers) never should.
+.reasonix/semantic/
+.reasonix/sessions/
+.reasonix/semantic-skip
+# Scratch entry regenerated each time scripts/bundle-codemirror.mjs runs.
+scripts/.cm-entry.mjs
+

README.md

@@ -6,6 +6,10 @@
   <em>Cache-first agent loop for DeepSeek V4 (flash + pro) — Ink TUI, MCP first-class, no LangChain.</em>
 </p>
 
+<p align="center">
+  <strong>English</strong> · <a href="./README.zh-CN.md">简体中文</a> · <a href="https://esengine.github.io/reasonix/">Website</a>
+</p>
+
 # Reasonix
 
 [![npm version](https://img.shields.io/npm/v/reasonix.svg)](https://www.npmjs.com/package/reasonix)
@@ -14,9 +18,10 @@
 [![downloads](https://img.shields.io/npm/dm/reasonix.svg)](https://www.npmjs.com/package/reasonix)
 [![node](https://img.shields.io/node/v/reasonix.svg)](./package.json)
 
-**A DeepSeek-native AI coding agent in your terminal.** Edits files as
-reviewable SEARCH/REPLACE blocks. Ink TUI. MCP first-class. No
-LangChain.
+**A DeepSeek-native AI coding agent in your terminal.** ~30× cheaper
+per task than Claude Code, with a cache-first loop engineered for
+DeepSeek's pricing model. Edits as reviewable SEARCH/REPLACE blocks.
+MIT-licensed. No IDE lock-in. MCP first-class.
 
 ---
 
@@ -67,6 +72,159 @@ command list.
 
 ---
 
+## Web dashboard *(new in 0.12)*
+
+Type `/dashboard` inside any session and Reasonix prints a localhost
+URL with a one-time token. Open it for a 13-tab control surface that
+mirrors the running TUI — chat (with live streaming), the editor (file
+tree + CodeMirror, syntax highlighting + autocomplete + side-by-side
+diff for pending edits), Usage / Sessions / Plans / Tools /
+Permissions / System / MCP / Skills / Memory / Hooks / Settings.
+
+```
+reasonix code › /dashboard
+▸ http://127.0.0.1:54219/?token=… (open in browser)
+```
+
+127.0.0.1 only, ephemeral token expires when the session ends, every
+mutation is CSRF-checked. The TUI keeps working — modals (shell
+confirms, plan reviews, edit gates) mirror to whichever surface you
+look at first. No build step, no Electron, no separate process to
+keep alive.
+
+---
+
+## Why Reasonix? (vs Cursor / Claude Code / Cline / Aider)
+
+Three things you'd come to Reasonix for, that nothing else combines:
+
+- **The cost economics actually land in your bill.** DeepSeek V4 is
+  ~30× cheaper than Claude Sonnet per token. Cheaper tokens alone
+  isn't the win — *cheap tokens with a 90%+ prefix-cache hit* is.
+  Reasonix's loop is engineered around append-only prompt growth so
+  the cache-stable prefix survives every tool call, which the
+  benchmarks section below verifies end-to-end (94.4% live, vs 46.6%
+  for a generic harness against the same workload). The `/stats`
+  panel tracks "vs Claude Sonnet 4.6" savings every turn so you can
+  watch your bill not happen.
+
+- **It lives in your terminal.** Pure CLI — no Electron, no VS Code
+  extension, no IDE plugin to wedge into your editor. Sits next to
+  git, tmux, and your shell history. macOS / Linux / Windows
+  (PowerShell, Git Bash, Windows Terminal all tested). The only
+  network call is to the DeepSeek API itself; no vendor server in
+  the middle.
+
+- **Open source and hackable, end to end.** MIT-licensed TypeScript.
+  The entire loop, tool registry, cache-stable prefix, TUI, MCP
+  bridge — all in `src/` under 30k lines. Fork it, ship a private
+  build, drop it into CI. No SaaS layer, no enterprise tier, no
+  feature gates.
+
+| | Reasonix | Claude Code | Cursor | Cline | Aider |
+|---|---|---|---|---|---|
+| Backend | DeepSeek V4 only | Anthropic only | OpenAI / Anthropic | any (OpenRouter) | any (OpenRouter) |
+| Cost / typical task | **~$0.001–$0.005** | ~$0.05–$0.50 | $20/mo + usage | varies | varies |
+| Where it runs | terminal | terminal + IDE | IDE (Electron) | VS Code only | terminal |
+| License | **MIT** | closed | closed | Apache 2 | Apache 2 |
+| Cache-first prefix loop | **engineered (94% hit)** | basic | n/a | n/a | basic |
+| MCP servers | **first-class** | first-class | — | beta | — |
+| Plan mode (read-only audit gate) | **yes** | yes | — | yes | — |
+| User-authored skills | **yes** | yes | — | — | — |
+| Edit review (no auto-write) | **yes** (`/apply`) | yes | partial | yes | yes |
+| Workspace switch (`/cwd`, `change_workspace`) | **yes** | — | n/a (per-window) | — | — |
+| Cross-session cost dashboard | **yes** (`/stats`) | — | — | — | — |
+| Sandbox boundary enforcement | **strict** (refuses `..` escape) | yes | partial | yes | partial |
+
+### Pick something else when
+
+- **You want multi-provider flexibility** (mix Claude / GPT / Gemini /
+  local Llama in one tool). Try [Aider](https://aider.chat) or
+  [Cline](https://cline.bot). Reasonix is DeepSeek-only on purpose —
+  every layer (cache-first loop, R1 harvesting, JSON-mode tool repair,
+  reasoning-effort cap) is tuned against DeepSeek-specific behavior
+  and economics. Coupling to one backend is the feature, not a
+  limitation we'll grow out of.
+- **You want IDE integration** (inline diff in your gutter,
+  multi-cursor, ghost text, refactor previews). Try
+  [Cursor](https://cursor.com) or Claude Code's IDE mode. Reasonix
+  is terminal-first; the diff lives in `git diff`, the file tree
+  lives in `ls`, the chat lives in your shell.
+- **You're chasing the hardest reasoning benchmarks.** Claude Opus
+  4.6 still wins some leaderboards. DeepSeek V4-pro is competitive
+  on most coding tasks but doesn't lead every benchmark. If your
+  task is "solve this PhD-level proof" rather than "fix this auth
+  bug," start with Claude.
+- **You need fully-local / fully-free**. DeepSeek's API has free
+  credit on signup, but isn't free forever. For air-gapped or
+  always-free, look at Aider + Ollama or [Continue](https://continue.dev).
+
+### "But DeepSeek now has an Anthropic-compatible API — can't I just point Claude Code at it?"
+
+You can. DeepSeek ships an official Anthropic-compatible endpoint at
+`https://api.deepseek.com/anthropic`, and Claude Code (or any Anthropic
+SDK client) talks to it without modification. The protocol works. The
+**caching economics** don't transfer, and that's the whole point.
+
+Look at DeepSeek's [own compatibility table](https://api-docs.deepseek.com/guides/anthropic_api):
+
+| Field | Status on DeepSeek's compat endpoint |
+|---|---|
+| `cache_control` markers | **Ignored** |
+| `mcp_servers` (API-level) | Ignored |
+| `thinking.budget_tokens` | Ignored |
+| Images / documents / citations | Not supported |
+
+`cache_control: Ignored` is the load-bearing line. Two completely
+different cache mechanics are colliding here:
+
+| | Anthropic native | DeepSeek auto-cache |
+|---|---|---|
+| Model | **Marker-based.** You put `cache_control` on a message; Anthropic caches "everything up to this marker" as a content-addressed unit. Multiple markers = multiple independent breakpoints. | **Byte-stable prefix.** The cache fingerprints the literal byte stream from byte 0. |
+| Claude Code's design | Built around this. Markers on system prompt + tool defs let the loop reorder, compact, or insert metadata after the markers without losing the cache. | n/a — Claude Code wasn't designed for byte-stable prefixes. |
+| What happens when Claude Code → DeepSeek compat | Markers stripped (ignored). Claude Code's main caching strategy disappears. | Falls back to auto-cache. But Claude Code's prefix isn't byte-stable (markers were the *substitute* for byte-stability), so auto-cache misses too. |
+
+Net effect: **Claude Code's loop, redirected at DeepSeek, gets the
+cheap tokens and loses the cache hit it depended on.** A loop running
+at 80%+ cache hit on Anthropic's marker cache lands somewhere in the
+40-60% range on DeepSeek's auto-cache (matches the generic-harness
+baseline in our benchmarks). Same model, same API, same workload —
+the loop's invariants don't fit the cache mechanic it's now talking
+to.
+
+Reasonix's loop was designed around byte-stable prefix from line one.
+No markers, no breakpoints — append-only is the invariant. That's why
+the same τ-bench workload lands at **94.4% cache hit** on Reasonix
+and **46.6%** on a cache-hostile baseline (committed transcripts;
+benchmarks section below). At DeepSeek's pricing — $0.07/Mtok
+uncached, ~$0.014/Mtok cached — the difference between 50% and 94%
+hit is **roughly 2.5× on input cost alone**.
+
+### "What about Aider / Cline / Continue?"
+
+They support DeepSeek natively (no compat layer needed) and you do
+get the cheap token price. What you don't get is the DeepSeek-
+specific loop work — those tools' loops support every backend
+generically (OpenAI / Anthropic / local Llama / ...) and use
+compaction + summarization patterns that destroy byte-stability. They
+land in the same 40-60% cache-hit range as the baseline. Plus a
+handful of DeepSeek-specific quirks generic loops don't handle:
+
+| Generic loops assume | DeepSeek actually does | Reasonix's fix |
+|---|---|---|
+| Reasoning emitted as a structured `thinking` block | R1 sometimes leaks tool-call JSON inside `<think>` tags | a `scavenge` pass that pulls escaped tool calls back out, otherwise the model thinks it called and waits for output that never comes |
+| Tool schemas validated strictly | DeepSeek silently drops deeply-nested object/array params | auto-flatten — nested params get rewritten to single-level prefixed names so the model sees them at all |
+| Tool-call args are well-formed JSON | DeepSeek occasionally produces `string="false"` and other malformed fragments | dedicated `ToolCallRepair` heals the common shapes before they hit dispatch |
+| Reasoning depth tuned via system-level switches | V4 exposes a `reasoning_effort` knob (`max` / `high`) | `/effort` slash + `--effort` flag, so users can step down for cheap turns |
+| Old tool results kept in full forever | 1M context — don't compact pre-emptively, but most agents do | call-storm breaker + result token cap, but the prefix is *never* rewritten; compaction lands as new turns at the tail |
+
+> Cache-stability isn't a feature you turn on; it's an invariant
+> the loop is designed around. Reasonix isn't yet-another agent
+> CLI — it's an agent CLI built around DeepSeek's specific cache
+> mechanic and pricing model.
+
+---
+
 ## `reasonix code` — pair programmer in your terminal
 
 Scoped to the directory you launch from. The model has native
@@ -180,8 +338,9 @@ reasonix code › /commit "fix: findByEmail case-insensitive"
   session file.
 - `/effort high` — step down from the default `max` agent-class
   reasoning_effort for cheaper/faster turns on simple tasks.
-- `npx reasonix code --preset max` — v4-pro + 3-way self-consistency
-  branching for gnarly refactors.
+- `npx reasonix code --preset pro` — v4-pro for the whole session,
+  no auto-downgrade to flash. Pair with `--branch 3` if you want
+  3-way self-consistency on gnarly refactors.
 - `npx reasonix code src/` — narrower sandbox (only `src/` is
   writable).
 - `npx reasonix code --no-session` — ephemeral; nothing saved.
@@ -212,8 +371,8 @@ in the file. No prompts, no completions, no tool arguments.
 ### Staying current
 
 The panel header shows the running version next to `Reasonix` (e.g.
-`Reasonix v0.5.21 · deepseek-v4-pro · harvest · max …`, the trailing
-`max` is the reasoning-effort badge — `/effort high` to step down).
+`Reasonix 0.12.6 · v4-flash · AUTO · max …`, the trailing `max` is
+the reasoning-effort badge — `/effort high` to step down).
 A quiet 24-hour background check against
 the npm registry surfaces a yellow `update: X.Y.Z` on the right side
 of the same row when a newer version has been published. No blocking,
@@ -399,7 +558,7 @@ your own MCP servers. Sessions persist per name under
 
 ```bash
 npx reasonix                             # uses saved config + wizard-selected MCP
-npx reasonix --preset smart              # reasoner + R1 harvest for this run
+npx reasonix --preset pro                # pin v4-pro for the whole run (no auto-downgrade)
 npx reasonix --session design            # named session — resume later with --session design
 ```
 
@@ -434,7 +593,7 @@ rendering, retries.
 
 | command | what it does |
 |---|---|
-| `/preset <fast\|smart\|max>` | one-tap bundle (model + harvest + branch) |
+| `/preset <auto\|flash\|pro>` | model commitment — `auto` = flash with escalation, `flash` = locked flash, `pro` = locked pro |
 | `/model <id>` | switch DeepSeek model (`deepseek-v4-flash`, `deepseek-v4-pro`, plus `deepseek-chat` / `deepseek-reasoner` compat aliases) |
 | `/models` | list live models from DeepSeek `/models` endpoint |
 | `/harvest [on\|off]` | toggle R1 plan-state extraction |
@@ -614,7 +773,7 @@ npx reasonix sessions                    # list saved sessions
 Common flags:
 
 ```bash
---preset <fast|smart|max>   # bundle (model + harvest + branch)
+--preset <auto|flash|pro>   # model commitment (auto / locked-flash / locked-pro)
 --model <id>                # explicit model id
 --harvest / --no-harvest    # R1 plan-state extraction
 --branch <N>                # self-consistency budget
@@ -767,7 +926,7 @@ cd reasonix
 npm install
 npm run dev code        # run CLI from source via tsx
 npm run build           # tsup to dist/
-npm test                # vitest (1007 tests)
+npm test                # vitest (1482 tests)
 npm run lint            # biome
 npm run typecheck       # tsc --noEmit
 ```

README.zh-CN.md

@@ -0,0 +1,855 @@
+<p align="center">
+  <img src="docs/logo.svg" alt="Reasonix — DeepSeek 原生的 agent 框架" width="640"/>
+</p>
+
+<p align="center">
+  <em>为 DeepSeek V4（flash + pro）打造的缓存优先 agent 循环 — Ink TUI、原生 MCP、不依赖 LangChain。</em>
+</p>
+
+<p align="center">
+  <a href="./README.md">English</a> · <strong>简体中文</strong> · <a href="https://esengine.github.io/reasonix/">官方网站</a>
+</p>
+
+# Reasonix
+
+[![npm version](https://img.shields.io/npm/v/reasonix.svg)](https://www.npmjs.com/package/reasonix)
+[![CI](https://github.com/esengine/reasonix/actions/workflows/ci.yml/badge.svg)](https://github.com/esengine/reasonix/actions/workflows/ci.yml)
+[![license](https://img.shields.io/npm/l/reasonix.svg)](./LICENSE)
+[![downloads](https://img.shields.io/npm/dm/reasonix.svg)](https://www.npmjs.com/package/reasonix)
+[![node](https://img.shields.io/node/v/reasonix.svg)](./package.json)
+
+**DeepSeek 原生的终端 AI 编程代理。** 单次任务成本约为 Claude Code 的
+1/30，缓存优先的循环是为 DeepSeek 的定价模型量身打造的。编辑以可审查的
+SEARCH/REPLACE 块呈现，落盘前必须确认。MIT 许可、不绑 IDE、原生 MCP。
+
+---
+
+## 60 秒快速上手
+
+**1. 获取 DeepSeek API Key。** 注册即送免费额度：
+<https://platform.deepseek.com/api_keys>
+
+**2. 切到项目目录运行。** 无需安装。
+
+```bash
+cd my-project
+npx reasonix code
+```
+
+首次运行会走 30 秒向导（粘贴 API key → 选预设 → 多选 MCP 服务器）。
+之后每次直接进入。
+
+**3. 让它改代码。** 模型会以 SEARCH/REPLACE 块的形式提出编辑——
+你不 `/apply`，磁盘不会被改。
+
+```
+reasonix code › users.ts 里 findByEmail 对大小写敏感导致登录失败，帮我改
+
+assistant
+  ▸ tool<search_files> → src/users.ts, src/users.test.ts
+  ▸ tool<read_file>    → (src/users.ts, 412 chars)
+  ▸ 找到了。findByEmail 直接用 === 比对。改成小写规范化并补一条测试。
+
+src/users.ts
+<<<<<<< SEARCH
+  return users.find(u => u.email === email);
+=======
+  const needle = email.toLowerCase();
+  return users.find(u => u.email.toLowerCase() === needle);
+>>>>>>> REPLACE
+
+▸ 1 处待应用编辑（1 个文件）— /apply 写入 · /discard 丢弃
+
+reasonix code › /apply
+▸ ✓ applied src/users.ts
+```
+
+要求 Node ≥ 20.10。支持 macOS、Linux、Windows（PowerShell · Git Bash ·
+Windows Terminal）。任何时候按 `Esc` 中断；`/help` 查看完整命令列表。
+
+---
+
+## Web 控制台 *(0.12 新功能)*
+
+会话内输入 `/dashboard`，Reasonix 会打印一个带一次性 token 的本地 URL。
+浏览器打开后是一个 13 个面板的控制面 —— 与正在运行的 TUI 实时双向同步：
+聊天（流式输出）、编辑器（文件树 + CodeMirror，语法高亮 + 自动补全 + 待
+审编辑的左右对比 diff）、Usage / Sessions / Plans / Tools / Permissions /
+System / MCP / Skills / Memory / Hooks / Settings。
+
+```
+reasonix code › /dashboard
+▸ http://127.0.0.1:54219/?token=… (open in browser)
+```
+
+仅监听 127.0.0.1，会话结束 token 立即失效，所有改动都走 CSRF 校验。
+TUI 继续可用 —— 弹窗（shell 确认、plan 审阅、edit 闸门）会同步到先看到
+它的那一边，另一边自动消失。没有打包步骤，没有 Electron，没有额外进程。
+
+---
+
+## 为什么选 Reasonix？（vs Cursor / Claude Code / Cline / Aider）
+
+三件事，别家不会同时都给你：
+
+- **成本节省落到账单上。** DeepSeek V4 的 token 单价大约是 Claude Sonnet
+  的 1/30。光便宜还不够 —— *便宜的 token 配上 90%+ 的前缀缓存命中*才是关键。
+  Reasonix 的循环按 append-only 增长设计，缓存稳定的前缀在每次工具调用之间
+  都活着，下面的 benchmark 章节端到端验证过：实测 94.4% 缓存命中，对照组通用
+  框架只有 46.6%。`/stats` 面板每轮都跟踪 "vs Claude Sonnet 4.6" 的节省额，
+  你可以亲眼看着账单不涨。
+
+- **它住在终端里。** 纯 CLI —— 没有 Electron，没有 VS Code 插件，没有要
+  塞进编辑器的 IDE 插件。和 git、tmux、shell 历史并排。macOS / Linux /
+  Windows（PowerShell、Git Bash、Windows Terminal 都测过）。唯一的网络
+  请求就是 DeepSeek API 本身，中间没有厂商服务器。
+
+- **开源且彻底可改。** MIT 许可的 TypeScript。整个循环、工具注册表、
+  缓存稳定前缀、TUI、MCP 桥接 —— 全部在 `src/` 下，不到 3 万行。Fork
+  它、做私有构建、塞进 CI 都可以。没有 SaaS 层，没有企业版，没有功能闸门。
+
+| | Reasonix | Claude Code | Cursor | Cline | Aider |
+|---|---|---|---|---|---|
+| 后端 | 仅 DeepSeek V4 | 仅 Anthropic | OpenAI / Anthropic | 任意（OpenRouter）| 任意（OpenRouter）|
+| 单次任务成本 | **~$0.001–$0.005** | ~$0.05–$0.50 | $20/月 + 用量 | 视情况 | 视情况 |
+| 运行环境 | 终端 | 终端 + IDE | IDE（Electron）| 仅 VS Code | 终端 |
+| 开源协议 | **MIT** | 闭源 | 闭源 | Apache 2 | Apache 2 |
+| 缓存优先前缀循环 | **工程化（94% 命中）** | 基础 | n/a | n/a | 基础 |
+| MCP 服务器 | **原生支持** | 原生支持 | — | 测试中 | — |
+| 计划模式（只读审计闸门）| **支持** | 支持 | — | 支持 | — |
+| 用户编写的 skills | **支持** | 支持 | — | — | — |
+| 编辑审阅（不自动落盘）| **支持**（`/apply`）| 支持 | 部分 | 支持 | 支持 |
+| 工作区切换（`/cwd`、`change_workspace`）| **支持** | — | n/a（每窗一项目）| — | — |
+| 跨会话成本面板 | **支持**（`/stats`）| — | — | — | — |
+| 沙箱边界强制 | **严格**（拒绝 `..` 逃逸）| 支持 | 部分 | 支持 | 部分 |
+
+### 这些情况下应该选别的
+
+- **你想要多模型混用**（在一个工具里同时切 Claude / GPT / Gemini / 本地 Llama）。
+  试试 [Aider](https://aider.chat) 或 [Cline](https://cline.bot)。Reasonix
+  故意只绑 DeepSeek —— 每一层（缓存优先循环、R1 harvest、JSON 模式的工具
+  调用修复、reasoning_effort 上限）都是为 DeepSeek 的具体行为和经济模型
+  调出来的。绑死后端是设计选择，不是早晚要解决的限制。
+- **你想要 IDE 集成**（编辑器侧边栏 inline diff、多光标、ghost text、重构
+  预览）。试试 [Cursor](https://cursor.com) 或 Claude Code 的 IDE 模式。
+  Reasonix 是终端优先的：diff 在 `git diff` 里、文件树在 `ls` 里、对话
+  在 shell 里。
+- **你在追最难的推理 benchmark**。Claude Opus 4.6 还是赢一些榜单的。
+  DeepSeek V4-pro 在大多数编程任务上都很有竞争力，但不是每个 benchmark
+  都领先。如果你的任务是"证明这个 PhD 级别的数学命题"而不是"修这个
+  auth bug"，从 Claude 起步更合适。
+- **你需要完全本地 / 永远免费**。DeepSeek API 注册送额度，但不是永久
+  免费。要真正离线/永久免费，看看 Aider + Ollama 或者
+  [Continue](https://continue.dev)。
+
+### "DeepSeek 现在有 Anthropic 兼容 API 了，我直接拿 Claude Code 接上不就行？"
+
+可以接。DeepSeek 官方提供了 Anthropic 兼容端点
+`https://api.deepseek.com/anthropic`，Claude Code（或任何 Anthropic SDK
+客户端）不改一行代码就能连上去。**协议跑得通，缓存经济学跑不通** ——
+而后者才是关键。
+
+看 [DeepSeek 自己的兼容性表](https://api-docs.deepseek.com/guides/anthropic_api)：
+
+| 字段 | 在 DeepSeek 兼容端点上的状态 |
+|---|---|
+| `cache_control` 标记 | **Ignored（被忽略）** |
+| `mcp_servers`（API 层）| Ignored |
+| `thinking.budget_tokens` | Ignored |
+| 图像 / 文档 / 引用 | 不支持 |
+
+`cache_control: Ignored` 就是杀手级的那一行。这里有**两套完全不同的缓存
+机制在打架**：
+
+| | Anthropic 原生 | DeepSeek 自动缓存 |
+|---|---|---|
+| 模型 | **Marker 驱动。** 你在某条消息上打 `cache_control`，Anthropic 把"到此 marker 为止"的内容做内容寻址缓存。多个 marker = 多个独立断点。 | **Byte-stable prefix。** 缓存对字面字节流从第 0 字节起做指纹。 |
+| Claude Code 的设计 | 围绕这个设计的。在 system prompt + tool 定义上插 marker，让 loop 在 marker 之后做重排、压缩、插元数据都不丢缓存。 | n/a —— Claude Code 不是为 byte-stable prefix 设计的。 |
+| Claude Code 接 DeepSeek 兼容端点之后 | Marker 被 strip（忽略）。Claude Code 的主缓存策略消失。 | Fallback 到 auto-cache。但 Claude Code 的 prefix 不是 byte-stable 的（marker 本来就是 byte-stability 的*替代*），auto-cache 也命中不了。 |
+
+净效果：**Claude Code 的 loop 重定向到 DeepSeek 之后，便宜 token 拿到了，
+原本依赖的缓存命中没了**。一个在 Anthropic marker cache 上 80%+ 命中的
+loop，到 DeepSeek 的 auto-cache 上大概率掉到 40-60%（跟我们 benchmark 里
+通用 harness 的 baseline 同区间）。同一个模型、同一个 API、同一个负载 ——
+loop 的 invariant 跟它现在对话的缓存机制不匹配。
+
+Reasonix 的 loop 从第一行起就是按 byte-stable prefix 的不变量设计的。没有
+marker、没有断点 —— append-only 就是 invariant。这就是为什么同一份 τ-bench
+负载在 Reasonix 上是 **94.4% 缓存命中**、在 cache-hostile baseline 上是
+**46.6%**（已 commit 的 transcript，见下面 benchmark 段）。按 DeepSeek 的
+单价 —— $0.07/Mtok 非缓存、约 $0.014/Mtok 缓存命中 —— 50% 和 94% 命中之间
+**仅 input 这一侧就大约是 2.5× 的差距**。
+
+### "那 Aider / Cline / Continue 呢？"
+
+它们原生支持 DeepSeek（不需要兼容层），便宜 token 单价你确实拿到了。
+但你拿不到 DeepSeek-specific 的循环工程 —— 这些工具的 loop 是为**通用支持**
+所有后端（OpenAI / Anthropic / 本地 Llama / ...）设计的，用的是那种会破坏
+byte-stability 的通用压缩 / 摘要模式。命中率落在和 baseline 同样的 40-60%
+区间。再加上一堆 DeepSeek 怪癖通用 loop 不处理：
+
+| 通用 loop 假定 | DeepSeek 实际行为 | Reasonix 怎么处理 |
+|---|---|---|
+| 推理通过结构化 `thinking` 块产出 | R1 偶尔把 tool-call JSON 漏到 `<think>` 标签里 | `scavenge` 扫描把漏出的 tool call 拣回，否则模型以为自己已经调用，等不到结果 |
+| tool schema 严格校验 | DeepSeek 静默丢弃深嵌套 object/array 参数 | auto-flatten：嵌套参数被重写成单层 prefixed name，模型才看得见 |
+| tool-call args 是良构 JSON | DeepSeek 偶发 `string="false"` 之类的破碎片段 | 专用 `ToolCallRepair` 在 dispatch 之前修好常见形状 |
+| 推理深度靠系统级开关 | V4 直接暴露 `reasoning_effort` 旋钮（`max` / `high`） | `/effort` slash + `--effort` flag，简单任务可以降到 high 省钱 |
+| 老 tool result 永久保留 | 1M context 不需要主动 compact，但通用工具都会做 | call-storm breaker + 结果 token cap，但前缀**永不重写** —— 压缩作为新 turn 追加在尾部 |
+
+> 缓存稳定性不是一个开关，是 loop 设计之初就要建立的不变量。Reasonix
+> 不是"又一个 agent CLI"，是**围绕 DeepSeek 具体的缓存机制和定价模型
+> 设计的 agent CLI**。
+
+---
+
+## `reasonix code` — 终端里的结对编程
+
+作用域为启动目录。模型自带 `read_file` / `write_file` / `edit_file` /
+`list_directory` / `search_files` / `directory_tree` / `get_file_info` /
+`create_directory` / `move_file`，全部在沙箱内 —— 任何解析后落到启动根目录之外
+的路径（包括 `..` 或符号链接逃逸）都会被拒绝。再加上带只读白名单的
+`run_command`；任何会修改状态的命令（`npm install`、`git commit` 等）都要走
+确认弹窗。
+
+### 流程演示：先看再改
+
+对于"这段代码做什么用？"这类问题，模型会用读取类工具，然后用散文回答 ——
+不会出 SEARCH/REPLACE 块、也不会写文件。只有你明确要求修改时它才动手：
+
+```
+reasonix code › 这个项目的路由是怎么组织的？
+assistant
+  ▸ tool<directory_tree> → (src/ tree, 47 entries)
+  ▸ tool<read_file> → (src/router.ts, 1.2 KB)
+  ▸ 路由分三层：顶层 AppRouter 注册 tab，每个 tab 用 React Router 的
+    nested routes 写子路径，最后 …
+```
+
+`edit_file` 的 SEARCH 块如果没有按字节精确匹配文件内容，编辑会被显式拒绝
+而不是模糊匹配。模型能看到错误并自行重试 —— 比起"静默改错"，"显式拒绝"
+是更安全的失败方式。
+
+### Plan 模式 —— 执行前先审阅
+
+任何比"改个 typo"更大的改动，模型会被引导先提交一份 markdown 计划。
+你会看到 **批准 / 重做 / 取消** 三选一：
+
+```
+reasonix code › 把 auth 从 JWT 迁移到 session cookies
+
+▸ plan submitted — awaiting your review
+────────────────────────────────────────
+## Summary
+Swap JWT middleware for session cookies, keep user table intact.
+
+## Files
+- src/auth/middleware.ts — replace `verifyJwt` with `readSession`
+- src/auth/session.ts — new file, in-memory store + signed cookie
+- src/routes/login.ts — return Set-Cookie instead of a token
+- tests/auth/*.test.ts — update fixtures
+
+## Risks
+- Existing logged-in users get logged out (no migration).
+- Session store is in-memory; restart clears sessions.
+────────────────────────────────────────
+  ▸ Approve and implement
+    Refine — explore more
+    Cancel
+```
+
+**强制启用** 用 `/plan` —— 进入显式只读阶段：模型必须先提交计划，否则任何
+编辑或非白名单 shell 调用都不会执行。适合那些你想先审一遍再让模型动手的
+高风险改动。`/plan off` 或在弹窗里选 Approve/Cancel 退出。
+
+### 输入前缀 —— `!cmd` 与 `@path`
+
+两个不需要斜杠的内联快捷方式：
+
+**`!<cmd>` —— 在沙箱里跑 shell 命令并把结果喂给模型。** 像 bash 一样在
+prompt 里直接打。输出既会进入可见日志，也会进入会话 —— 模型下一轮会基于它
+推理：
+
+```
+reasonix code › !git status --short
+▸ M src/users.ts
+▸ M src/users.test.ts
+
+reasonix code › 把这两个文件的改动说明一下
+assistant
+  ▸ tool<read_file> → src/users.ts, src/users.test.ts
+  ▸ …
+```
+
+无白名单门 —— 用户主动输入的 shell 命令就是显式同意。60 秒超时、32k 字符
+上限，0.5.14 起会话恢复后依然保留。
+
+**`@path/to/file` —— 内联一个文件作为 "Referenced files"。** 输入 `@`
+弹出选择器（↑/↓ 切换、Tab/Enter 插入）。比让模型 `read_file` 后再问更省事：
+"@src/users.ts 这个文件做什么用？"。沙箱限定：仅相对路径、不允许 `..`、单
+文件 64KB 上限。最近用过的文件排在前面。
+
+### `/commit` —— 一步暂存 + 提交
+
+```
+reasonix code › /commit "fix: findByEmail case-insensitive"
+▸ git add -A && git commit -m "fix: findByEmail case-insensitive"
+  [main a1b2c3d] fix: findByEmail case-insensitive
+```
+
+### 一些值得试试的命令
+
+- `/tool 1` —— 打印最后一次工具调用的完整输出（当 400 字内联剪辑不够看时）。
+- `/think` —— 看上一轮模型的完整推理（思考模式：v4-flash / v4-pro / reasoner 别名）。
+- `/undo` —— 回滚上一批已应用的编辑。
+- `/new` —— 在同一目录开新会话，但不丢失旧会话文件。
+- `/effort high` —— 从默认 `max` agent 推理强度降一档，简单任务更省更快。
+- `npx reasonix code --preset pro` —— 整轮锁定 v4-pro，不再自动降级到
+  flash。如果想要 self-consistency 分支，加 `--branch 3` 跑三路投票。
+- `npx reasonix code src/` —— 更窄的沙箱（只有 `src/` 可写）。
+- `npx reasonix code --no-session` —— 临时会话，什么都不存。
+
+### `reasonix stats` —— 你到底省了多少？
+
+每次 `reasonix chat|code|run` 跑完都会往
+`~/.reasonix/usage.jsonl` 追加一条精简记录（token + 成本 + Claude Sonnet
+4.6 同负载下的等价价格）。`reasonix stats` 不带参数会把日志聚合成今日 /
+本周 / 本月 / 历史 四个窗口：
+
+```
+Reasonix usage — /Users/you/.reasonix/usage.jsonl
+
+            turns  cache hit    cost (USD)      vs Claude     saved
+----------------------------------------------------------------------
+today           8      95.1%     $0.004821        $0.1348      96.4%
+week           34      93.8%     $0.023104        $0.6081      96.2%
+month         127      94.2%     $0.081530        $2.1452      96.2%
+all-time      342      94.0%     $0.210881        $5.8934      96.4%
+```
+
+隐私：日志里只有 token、成本和你自己取的 session 名。没有 prompt、没有
+completion、没有工具参数。`reasonix stats <transcript>` 仍兼容老用法
+（按文件出 assistant turn + tool call 摘要）。
+
+### 保持最新
+
+面板顶栏在 `Reasonix` 旁边显示当前版本（如
+`Reasonix 0.12.6 · v4-flash · AUTO · max …`，最后那个 `max` 是推理强度
+徽章 —— `/effort high` 可降一档）。后台每 24 小时静默查询一次 npm
+registry，发现新版会在同一行右侧显示黄色 `update: X.Y.Z`。不阻塞、不烦人，
+每天最多查一次，离线 / 防火墙下静默失败。
+
+```bash
+reasonix update             # 打印当前 vs 最新，并执行 `npm i -g reasonix@latest`
+reasonix update --dry-run   # 只打印计划，不实际安装
+```
+
+通过 `npx` 用？命令会识别这种情况并改为打印 cache 刷新提示 —— npx 在下次
+调用时会自动取最新版本。
+
+### 项目约定 —— `REASONIX.md`
+
+把 `REASONIX.md` 放到项目根目录，每次启动都会被钉进 system prompt。可提交
+的团队记忆 —— 房间约定、领域词表、模型老忘的事情：
+
+```bash
+cat > REASONIX.md <<'EOF'
+# Notes for Reasonix
+- Use snake_case for new Python modules; legacy camelCase modules keep their style.
+- `cargo check` is in the auto-run allowlist; full `cargo test` needs confirmation.
+- The `api/` dir mirrors `backend/` — keep schemas in sync.
+EOF
+```
+
+重启（或 `/new`）后生效；前缀每会话只哈希一次，让 DeepSeek 的缓存保持热。
+`/memory` 打印当前已钉的内容。`REASONIX_MEMORY=off` 在 CI / 离线复现时关闭
+所有记忆来源。
+
+### 用户记忆 —— `~/.reasonix/memory/`
+
+第二层 **私人按用户** 的记忆放在你的 home 目录。不像 `REASONIX.md` 会被
+提交，模型自己也能通过 `remember` 工具往里写。两个作用域：
+
+- `~/.reasonix/memory/global/` —— 跨项目（你的偏好、工具链）。
+- `~/.reasonix/memory/<project-hash>/` —— 限定一个 `reasonix code` 沙箱
+  根目录（决策、本地事实、按仓库的快捷方式）。
+
+每个作用域都维护一个总是加载的 `MEMORY.md` 索引（一行一条）+ 零或多个
+`<name>.md` 详情文件（按需通过 `recall_memory` 加载）。写入立刻生效；钉进
+system prompt 在下一次 `/new` 或重启时生效，以保证当前会话的缓存前缀稳定。
+
+```
+reasonix code › 我用 bun 而不是 npm，请以后都用 bun 跑构建
+
+assistant
+  ▸ tool<remember> → project/bun_build saved
+    "Build command on this machine is `bun run build`"
+```
+
+**斜杠**：`/memory` · `/memory list` · `/memory show <name>` ·
+`/memory forget <name>` · `/memory clear <scope> confirm`。
+**模型工具**：`remember(type, scope, name, description, content)` ·
+`forget(scope, name)` · `recall_memory(scope, name)`。
+
+项目作用域只在 `reasonix code` 里可用（需要真实的沙箱根来计算哈希）；纯
+`reasonix` 只有全局作用域。
+
+### Skills —— 用户自定义的 prompt 包
+
+Skill 就是你写在磁盘上的散文指令块。Reasonix 把它们的名字 + 一行描述钉
+进 system prompt；模型可以在合适时机自动调 `run_skill({name: "..."})`，
+你也可以打 `/skill <name> [args]` 手动触发。
+
+两个作用域，与用户记忆同样的布局：
+
+- `<project>/.reasonix/skills/` —— 按项目（提交进 git 给团队，或加入
+  `.gitignore` 做个人草稿）。
+- `~/.reasonix/skills/` —— 全局，到处可用。
+
+两种文件结构都行：`<name>/SKILL.md`（推荐 —— 可同时打包附带资源）或扁平
+`<name>.md`。
+
+```markdown
+---
+name: review
+description: Review uncommitted changes and flag risks
+---
+
+Run `git diff` on staged and unstaged changes. Summarize what each
+hunk does, call out potential regressions, and list files that might
+need additional tests. Don't propose edits unless I ask.
+```
+
+用法：
+
+```
+reasonix code › /skill review
+▸ running skill: review
+assistant
+  ▸ tool<run_command> → git diff --cached
+  ▸ 3 改动，1 个需要回归测试 …
+```
+
+或者让模型自己挑 —— 因为 skill 名字 + 描述都在前缀里，问 "帮我看下未提交
+的改动有没有风险" 就会触发 `run_skill({name: "review"})`，不用你打斜杠。
+
+**斜杠**：`/skill`（列出） · `/skill show <name>` · `/skill <name>
+[args]`（把 body 作为用户轮注入）。
+
+**故意不绑死** 任何其他客户端的目录约定（`.claude/skills` 等等）——
+Reasonix 在对话层是模型无关的。任何 SKILL.md 都能用；body 是散文，所以
+为别的工具写的 skill 多半能直接用（Reasonix 工具名不同 —— `filesystem`
+/ `shell` / `web` —— 但模型读到指令后会挑我们的等价工具）。
+
+### Hooks —— 围绕工具调用与轮次自动化
+
+在 `.reasonix/`（项目或 `~/`）放一个 `settings.json`，Reasonix 会在
+循环里四个常见的点触发 shell 命令：工具运行前、工具返回后、prompt 到达
+模型前、轮次结束后。
+
+```json
+// <project>/.reasonix/settings.json   ← 可提交
+// ~/.reasonix/settings.json           ← 按用户
+{
+  "hooks": {
+    "PreToolUse":       [{ "match": "edit_file|write_file", "command": "bun scripts/guard.ts" }],
+    "PostToolUse":      [{ "match": "edit_file", "command": "biome format --write" }],
+    "UserPromptSubmit": [{ "command": "echo $(date +%s) >> ~/.reasonix/prompts.log" }],
+    "Stop":             [{ "command": "bun test --run", "timeout": 60000 }]
+  }
+}
+```
+
+每个 hook 都是 shell 命令。Reasonix 调用时通过 stdin 传一份 JSON 信封，
+描述事件：
+
+```json
+{ "event": "PreToolUse", "cwd": "/path/to/project",
+  "toolName": "edit_file", "toolArgs": { "path": "src/x.ts", "..." } }
+```
+
+退出码决定走向：
+
+- **0** —— 通过；循环正常继续
+- **2** —— 阻断（仅对 `PreToolUse` / `UserPromptSubmit` 生效）；hook 的
+  stderr 会作为合成工具结果让模型看到，或者整条 prompt 直接被丢弃
+- **其他** —— 警告；循环继续，stderr 渲染为黄色行内提示
+
+`match` 是对工具名的锚定正则；`*` 或省略匹配所有工具。项目 hook 先于全局
+hook 触发。默认超时：阻断类事件 5 秒，日志类事件 30 秒；可在每条 hook 里
+用 `timeout` 覆盖。
+
+**斜杠**：`/hooks`（列出当前生效的 hook）· `/hooks reload`（不丢会话从磁盘
+重读 `settings.json`）。
+
+### 在 TUI 里保持最新
+
+`/update` 在运行中的会话里会显示当前版本、最近一次后台 24h 检查取到的最新
+版本，以及实际安装命令。这条斜杠 **不会** 直接 spawn `npm install` ——
+stdio:inherit 进入正在跑的 Ink 渲染器会把显示搞乱。要真正升级请退出会话，
+在新 shell 里执行 `reasonix update`。
+
+---
+
+## `reasonix` —— 也能当通用聊天
+
+同一套 TUI，没有文件系统工具（除非你通过 MCP 主动接入）。适合起草、问答、
+schema 设计、架构讨论，或者驱动你自己的 MCP 服务器。会话按名字保存在
+`~/.reasonix/sessions/`。
+
+```bash
+npx reasonix                             # 用已保存配置 + 向导选过的 MCP
+npx reasonix --preset pro                # 整轮锁定 v4-pro（不自动降级）
+npx reasonix --session design            # 命名会话 — 之后 --session design 续聊
+```
+
+临时挂 MCP 服务器：
+
+```bash
+npx reasonix \
+  --mcp "fs=npx -y @modelcontextprotocol/server-filesystem /tmp/safe" \
+  --mcp "kb=https://mcp.example.com/sse"
+```
+
+MCP 工具走和原生工具一样的 Cache-First + 修复 + 上下文安全管线 —— 32k
+结果上限、实时进度通知渲染、自动重试。
+
+---
+
+## 会话内命令
+
+**核心**
+
+| 命令 | 作用 |
+|---|---|
+| `/help` · `/?` | 完整命令参考（带提示） |
+| `/status` | 当前模型 · flag · 上下文 · 会话 |
+| `/new` · `/reset` | 同会话内开新对话 |
+| `/clear` | 仅清空可见 scrollback（日志保留） |
+| `/retry` | 截断并重发上一条消息（重新采样） |
+| `/exit` · `/quit` | 退出 |
+
+**模型**
+
+| 命令 | 作用 |
+|---|---|
+| `/preset <auto\|flash\|pro>` | 模型策略 —— `auto` = flash 自动升级、`flash` = 锁 flash、`pro` = 锁 pro |
+| `/model <id>` | 切换 DeepSeek 模型（`deepseek-v4-flash`、`deepseek-v4-pro`，加上 `deepseek-chat` / `deepseek-reasoner` 兼容别名） |
+| `/models` | 列出 DeepSeek `/models` 端点的可用模型 |
+| `/harvest [on\|off]` | 切换 R1 plan-state 提取 |
+| `/branch <N\|off>` | 每轮跑 N 路并行采样，挑最佳（N ≥ 2） |
+| `/effort <high\|max>` | reasoning_effort 上限 —— `max` 是 agent 默认，`high` 更便宜更快 |
+| `/think` | 打印上一轮的完整 thinking-mode 推理 |
+
+**上下文与工具**
+
+| 命令 | 作用 |
+|---|---|
+| `/mcp` | 列出已挂载的 MCP 服务器及其 tool / resource / prompt |
+| `/resource [uri]` | 浏览 + 读取 MCP resource（无参 → 列 URI；`<uri>` → 拉取） |
+| `/prompt [name]` | 浏览 + 拉取 MCP prompt |
+| `/tool [N]` | 打印第 N 次工具调用的完整输出（1 = 最近） |
+| `/compact [tokens]` | 压缩日志里超大的工具结果（默认每条结果 4000 tokens） |
+| `/context` | 看上下文 token 都花在哪（system / tools / log） |
+| `/stats` | 跨会话成本仪表盘（today / week / month / all-time） |
+| `/keys` | 键盘快捷键 + 输入前缀（`!` / `@` / `/`）速查 |
+
+**记忆与 Skill**
+
+| 命令 | 作用 |
+|---|---|
+| `/memory` | 显示已钉记忆（REASONIX.md + ~/.reasonix/memory） |
+| `/memory list` · `show <name>` · `forget <name>` · `clear <scope> confirm` | 管理记忆库 |
+| `/skill` · `/skill list` | 列出已发现的 skill（项目 + 全局） |
+| `/skill show <name>` | 打印某个 skill 的 body |
+| `/skill <name> [args]` | 运行 skill（把 body 作为用户轮注入） |
+
+**会话**
+
+| 命令 | 作用 |
+|---|---|
+| `/sessions` | 列出已保存的会话（当前用 `▸` 标记） |
+| `/forget` | 从磁盘删除当前会话 |
+| `/setup` | 重新配置（退出后跑 `reasonix setup`） |
+
+**只在 code 模式下** (`reasonix code`)
+
+| 命令 | 作用 |
+|---|---|
+| `/apply` | 把待应用的 SEARCH/REPLACE 块写入磁盘 |
+| `/discard` | 丢弃待应用的编辑块 |
+| `/undo` | 回滚最后一批已应用的编辑 |
+| `/commit "msg"` | `git add -A && git commit -m "msg"` |
+| `/plan [on\|off]` | 切换只读 plan 模式 |
+| `/apply-plan` | 强制批准当前待审计划 |
+
+**键盘**
+
+- `Enter` —— 提交
+- `Shift+Enter` / `Ctrl+J` —— 换行（多行粘贴也行；
+  `\` + Enter 是跨平台兜底）
+- `↑` / `↓` —— 空闲时翻 prompt 历史；在斜杠自动补全里上下选
+- `/foo` 前缀下按 `Tab` / `Enter` —— 接受高亮的建议
+- `Esc` —— 中断当前轮（停 API 调用、取消进行中的工具、拒绝待响应的 MCP 请求）
+- 确认弹窗里的 `y` / `n` —— 快捷接受 / 拒绝
+
+---
+
+## 会话与安全网
+
+- 会话以 JSONL 形式保存在 `~/.reasonix/sessions/<name>.jsonl`（`reasonix
+  code` 按目录分）。每条消息都原子追加；`Ctrl+C` 不会丢上下文。
+- 工具结果每次调用最多 32k 字符。超大会话加载时自动自愈（缩小并重写文件）。
+- 每次出站 API 调用前会校验 `assistant.tool_calls` / `tool` 的配对，损坏的
+  会话不会一直 400。
+- 上下文仪表 50% 变黄、80% 变红并提示 `/compact`。接近 1M token 上限
+  （V4 flash + pro）会先尝试自动压缩，再退化为强制总结。
+- `reasonix code` 沙箱拒绝任何解析后落到启动目录之外的路径（含符号链接
+  逃逸和 `..` 穿越）。
+
+### 故障排查：重复行 / 鬼影渲染
+
+有些 Windows 终端（Git Bash / MINTTY / winpty 包装的 shell）没完整实现
+Ink 用的 ANSI cursor-up 转义。表现：spinner、流式预览、工具结果行不在原地
+覆盖刷新，反而在 scrollback 里印出多份。
+
+遇到了就用 plain 模式：
+
+```bash
+REASONIX_UI=plain npx reasonix code
+```
+
+Plain 模式抑制了实时 / 动画行，关掉了内部 tick 计时器。代价是失去流式预览
+和 spinner，但 scrollback 稳定。Windows Terminal、Windows Terminal 里的
+PowerShell 7、WezTerm 不需要这个开关。
+
+---
+
+## Web 搜索 —— 默认开
+
+模型一启动就有两个 web 工具：`web_search` 和 `web_fetch`。无 flag、无 API
+key、无注册。当你问到模型训练时没见过的事（新发布、最近事件、冷门 API），
+它会自己决定调 `web_search`；snippet 不够就跟一个 `web_fetch`。
+
+底层是 **Mojeek** 的公开搜索页 —— 独立 web 索引，bot 友好，无 cookie /
+session。冷门或非常新的查询覆盖率比 Google/Bing 薄一些，但脚本里很可靠。
+（DDG 是原始后端，但 2026 年开始上反机器人页。）
+
+**关掉**（离线 / 隐私 / CI）：
+
+```json
+// ~/.reasonix/config.json
+{ "apiKey": "sk-…", "search": false }
+```
+
+```bash
+REASONIX_SEARCH=off npx reasonix code
+```
+
+**接自己的**（Kagi、SearXNG、内部缓存）：实现 `WebSearchProvider` 接口
+然后自己调 `registerWebTools(registry, { provider })`，或通过 `--mcp`
+桥接已有的 MCP 搜索服务器。
+
+---
+
+## MCP —— 自带工具
+
+任意 [MCP](https://spec.modelcontextprotocol.io/) 服务器都能用。向导内置
+目录可选，或用 flag 直接挂：
+
+```bash
+# stdio（本地子进程）
+npx reasonix --mcp "fs=npx -y @modelcontextprotocol/server-filesystem /tmp/safe"
+
+# 同时挂多个
+npx reasonix \
+  --mcp "fs=npx -y @modelcontextprotocol/server-filesystem /tmp/safe" \
+  --mcp "demo=npx tsx examples/mcp-server-demo.ts"
+
+# HTTP+SSE（远程 / 托管）
+npx reasonix --mcp "kb=https://mcp.example.com/sse"
+```
+
+`reasonix mcp list` 显示精选目录。`reasonix mcp inspect <spec>` 不开聊天，
+直接连一次并打印服务器的 tool / resource / prompt。长任务的进度通知
+（2025-03-26 spec）会以进度条形式实时渲染在 spinner 里。
+
+支持的传输：**stdio**（本地命令）和 **HTTP+SSE**（远程，MCP 2024-11-05
+spec）。
+
+---
+
+## CLI 参考
+
+```bash
+npx reasonix code [path]                 # 编程模式，作用域 path（默认 cwd）
+npx reasonix                             # 聊天（用已保存配置）
+npx reasonix setup                       # 重跑配置向导
+npx reasonix chat --session work         # 命名会话
+npx reasonix chat --no-session           # 临时会话
+npx reasonix run "ask anything"          # 一次性运行，结果流到 stdout
+npx reasonix stats session.jsonl         # 总结一份 transcript
+npx reasonix replay chat.jsonl           # 从 transcript 重建成本/缓存视图
+npx reasonix diff a.jsonl b.jsonl --md   # 对比两份 transcript
+npx reasonix mcp list                    # 精选 MCP 目录
+npx reasonix mcp inspect <spec>          # 探测单个 MCP 服务器
+npx reasonix sessions                    # 列已保存会话
+```
+
+常用 flag：
+
+```bash
+--preset <auto|flash|pro>   # 模型策略（auto / 锁 flash / 锁 pro）
+--model <id>                # 显式指定模型 ID
+--harvest / --no-harvest    # R1 plan-state 提取
+--branch <N>                # self-consistency 预算
+--mcp "name=cmd args…"      # 挂 MCP 服务器（可重复）
+--transcript path.jsonl     # 同时旁路写一份 JSONL transcript
+--session <name>            # 命名会话（code 模式默认按目录）
+--no-session                # 临时会话
+--no-config                 # 忽略 ~/.reasonix/config.json（CI 友好）
+```
+
+环境变量（覆盖 config）：
+
+```bash
+export DEEPSEEK_API_KEY=sk-...
+export DEEPSEEK_BASE_URL=https://...   # 可选的备用端点
+export REASONIX_MEMORY=off              # 关闭 REASONIX.md + 用户记忆
+export REASONIX_SEARCH=off              # 关闭 web_search / web_fetch
+export REASONIX_UI=plain                # 关闭实时行（鬼影绕开）
+```
+
+---
+
+## 库用法
+
+```ts
+import {
+  CacheFirstLoop,
+  DeepSeekClient,
+  ImmutablePrefix,
+  ToolRegistry,
+} from "reasonix";
+
+const client = new DeepSeekClient(); // 从环境变量读 DEEPSEEK_API_KEY
+const tools = new ToolRegistry();
+
+tools.register({
+  name: "add",
+  description: "Add two integers",
+  parameters: {
+    type: "object",
+    properties: { a: { type: "integer" }, b: { type: "integer" } },
+    required: ["a", "b"],
+  },
+  fn: ({ a, b }: { a: number; b: number }) => a + b,
+});
+
+const loop = new CacheFirstLoop({
+  client,
+  tools,
+  prefix: new ImmutablePrefix({
+    system: "You are a math helper.",
+    toolSpecs: tools.specs(),
+  }),
+  harvest: true,
+  branch: 3,
+});
+
+for await (const ev of loop.step("What is 17 + 25?")) {
+  if (ev.role === "assistant_final") console.log(ev.content);
+}
+console.log(loop.stats.summary());
+```
+
+`ChatOptions.seedTools` 接受一个预置好的 `ToolRegistry`，如果你只想要
+`reasonix code` 的 loop 接线、不要 CLI 包装。详见
+[docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)。
+
+---
+
+## 性能对比 —— 缓存命中率自己也能验证
+
+这里每个抽象都对应 DeepSeek 的一个具体特性 —— 极低 token 价、R1 推理轨
+迹、自动前缀缓存、JSON 模式。通用框架把这些机会全留在桌上。
+
+| | Reasonix 默认 | 通用框架 |
+|---|---|---|
+| 前缀稳定的循环（→ 85–95% 缓存命中） | 是 | 否（每轮重建 prompt） |
+| 自动展平深层 tool schema | 是 | 否（DeepSeek 会丢参数） |
+| 带 jitter 退避的 429/503 重试 | 是 | 否（要自己写回调） |
+| 抢救泄到 `<think>` 里的 tool call | 是 | 否 |
+| 同参数重复爆发熔断 | 是 | 否 |
+| 实时缓存命中 / 成本 / vs Claude 面板 | 是 | 否 |
+
+同一 τ-bench-lite 负载（8 个多轮工具调用任务 × 3 次重复 = 每边 48 次运行），
+实测 DeepSeek `deepseek-chat`，唯一变量是前缀稳定性：
+
+| 指标 | 基线（缓存敌对） | Reasonix | 差值 |
+|---|---:|---:|---:|
+| 缓存命中 | 46.6% | **94.4%** | +47.7 pp |
+| 单任务成本 | $0.002599 | $0.001579 | **−39%** |
+| 通过率 | 96% (23/24) | **100% (24/24)** | — |
+
+**无需消耗 API 额度即可复现：**
+
+```bash
+git clone https://github.com/esengine/reasonix.git && cd reasonix && npm install
+npx reasonix replay benchmarks/tau-bench/transcripts/t01_address_happy.reasonix.r1.jsonl
+npx reasonix diff \
+  benchmarks/tau-bench/transcripts/t01_address_happy.baseline.r1.jsonl \
+  benchmarks/tau-bench/transcripts/t01_address_happy.reasonix.r1.jsonl
+```
+
+提交进仓库的 JSONL 文件每轮带 `usage`、`cost`、`prefixHash`。Reasonix
+的前缀哈希在每次模型调用时都字节稳定；基线则每轮都变。缓存差距是从日志稳
+定性 **机械可推导** 的，不依赖于 prompt 写得不一样。
+
+完整 48 次运行报告：
+[`benchmarks/tau-bench/report.md`](./benchmarks/tau-bench/report.md)。
+用自己的 API key 复现：`npx tsx benchmarks/tau-bench/runner.ts --repeats 3`。
+
+MCP 参考运行（即使两个 MCP 子进程并发，整 5 轮也只有一个前缀哈希）：
+
+| 服务器 | 轮次 | 缓存命中 | 成本 | vs Claude |
+|---|---:|---:|---:|---:|
+| 内置 demo（`add` / `echo` / `get_time`） | 2 | **96.6%**（第 2 轮） | $0.000254 | −94.0% |
+| 官方 `server-filesystem` | 5 | **96.7%** | $0.001235 | −97.0% |
+| **两者并发** | 5 | **81.1%** | $0.001852 | −95.9% |
+
+---
+
+## Non-goals（明确不做）
+
+- **多 agent 编排 / 子 agent**（用 LangGraph）。
+- **工作流 DSL / DAG 调度 / 并行分支引擎** —— skill 是散文，模型靠正常的
+  tool-use 循环串起来。这样保住了单循环 + append-only + cache-first 三大
+  不变量。
+- **多供应商抽象**（用 LiteLLM）。Reasonix 故意只做 DeepSeek —— 每个支柱
+  （cache-first 循环、R1 抢救、tool-call 修复）都针对 DeepSeek 的具体行为
+  和经济性做了调优。绑死一家后端是特性。
+- **RAG / 向量库**（用 LlamaIndex）。
+- **Web UI / SaaS。**
+
+Reasonix 只做 DeepSeek，做到底。
+
+---
+
+## 开发
+
+```bash
+git clone https://github.com/esengine/reasonix.git
+cd reasonix
+npm install
+npm run dev code        # 用 tsx 直接从源码跑 CLI
+npm run build           # tsup 打包到 dist/
+npm test                # vitest（1482 个测试）
+npm run lint            # biome
+npm run typecheck       # tsc --noEmit
+```
+
+---
+
+## License
+
+MIT

REASONIX.md

@@ -0,0 +1,64 @@
+# Reasonix — working knowledge
+
+TypeScript project. DeepSeek-native coding agent, cache-first loop.
+MIT-licensed. Node ≥20.10 required.
+
+## Stack
+
+- **Language** — TS 5.6+, ES2022, ESM (`"type": "module"`)
+- **CLI** — Commander.js + Ink 5 (React 18) TUI
+- **Test** — Vitest 2.x
+- **Lint / Format** — Biome 1.9 (2-space, double quotes, semicolons always, 100 width)
+- **Build** — tsup (bundle), `tsx` (dev runner)
+- **MCP** — stdio + SSE transports, in-process fake in tests
+
+## Layout
+
+| Path | What |
+|---|---|
+| `src/` | All source — `mcp/`, `tools/`, `cli/`, `code/`, `repair/`, `index/` |
+| `src/cli/` | CLI entry + commands (`chat.tsx`, `code.tsx`, `diff.ts`, etc.) + Ink TUI in `ui/` |
+| `src/tools/` | Tool defs (filesystem, shell, MCP, plan, subagent, web, workspace) |
+| `src/mcp/` | MCP client, transports (stdio, SSE), registry, spec |
+| `src/repair/` | Tool-call repair pipeline (flatten, scavenge, storm, truncation) |
+| `src/index/` | Semantic vector index |
+| `tests/` | Vitest tests, flat `*.test.ts` |
+| `examples/` | `basic-chat.ts`, `mcp-server-demo.ts`, etc. |
+| `benchmarks/` | Harvest + tau-bench harnesses |
+| `data/` | Tokenizer data (`deepseek-tokenizer.json.gz`) |
+| `dist/` | Build output — **do not edit** |
+| `.github/` | CI + issue templates |
+
+## Commands
+
+```sh
+npm run build       # tsup → dist/
+npm run dev         # tsx src/cli/index.ts
+npm run chat        # tsx src/cli/index.ts chat
+npm run test        # vitest run
+npm run test:watch  # vitest
+npm run lint        # biome check src tests
+npm run lint:fix    # biome check --write src tests
+npm run format      # biome format --write src tests
+npm run typecheck   # tsc --noEmit
+```
+
+`prepublishOnly`: lint → typecheck → test → build.
+
+## Conventions
+
+- **Imports** — explicit `import type` for type-only imports (Biome `useImportType: warn`). Direct relative imports within project, no barrel re-exports.
+- **Exports** — named exports only; no `export default`. Entry: `src/index.ts`.
+- **Tests** — vitest `describe`/`it`/`expect`, no globals. Naming: `<module>.test.ts` flat in `tests/`.
+- **JSX** — `.tsx` for Ink components. `jsx: "react"` in tsconfig.
+- **TypeScript** — `strict`, `noUncheckedIndexedAccess`, `noImplicitOverride`. Tools accept `ToolCallContext` (abort signal).
+- **MCP** — All transports implement `McpTransport` interface. Tools registered via registry at startup.
+- **Changelog** — Keep a Changelog format. Semver.
+
+## Watch out for
+
+- **This IS Reasonix** — edits to `src/loop.ts`, `src/repair/`, `src/tools/`, `src/mcp/` affect every session. Test before publishing.
+- **SEARCH must match byte-for-byte** — the edit-gate in `src/code/edit-blocks.ts` enforces exact match. Trailing whitespace or wrong indent = mismatch.
+- **`dist/`** is generated by `tsup`. Never hand-edit.
+- **`.reasonix/semantic/`** is auto-generated vector index. Never hand-edit.
+- **`sessions/` and `.reasonix/sessions/`** are user-private, git-ignored (per `.gitignore`).

benchmarks/harvest/runner.ts

@@ -21,7 +21,11 @@ import {
   claudeEquivalentCost,
   loadDotenv,
 } from "../../src/index.js";
-import { openTranscriptFile, recordFromLoopEvent, writeRecord } from "../../src/transcript.js";
+import {
+  openTranscriptFile,
+  recordFromLoopEvent,
+  writeRecord,
+} from "../../src/transcript/log.js";
 import { TASKS } from "./tasks.js";
 import type {
   HarvestBenchMeta,

benchmarks/tau-bench/runner.ts

@@ -25,7 +25,11 @@ import {
   costUsd,
   loadDotenv,
 } from "../../src/index.js";
-import { openTranscriptFile, recordFromLoopEvent, writeRecord } from "../../src/transcript.js";
+import {
+  openTranscriptFile,
+  recordFromLoopEvent,
+  writeRecord,
+} from "../../src/transcript/log.js";
 import { BaselineAgent } from "./baseline.js";
 import { cloneDb } from "./db.js";
 import { TASKS } from "./tasks.js";

biome.json

@@ -24,6 +24,6 @@
     }
   },
   "files": {
-    "ignore": ["dist", "node_modules", "coverage", "*.d.ts"]
+    "ignore": ["dist", "node_modules", "coverage", "*.d.ts", "dashboard/codemirror.js"]
   }
 }

dashboard/codemirror.js

@@ -0,0 +1,36 @@
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Line truncated
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dashboard/index.html

@@ -0,0 +1,19 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Reasonix</title>
+    <meta name="reasonix-token" content="__REASONIX_TOKEN__" />
+    <meta name="reasonix-mode" content="__REASONIX_MODE__" />
+    <link rel="stylesheet" href="/assets/app.css?token=__REASONIX_TOKEN__" />
+    <link rel="stylesheet" href="https://esm.sh/[email protected]/dist/uPlot.min.css" />
+    <link rel="stylesheet" href="https://esm.sh/[email protected]/styles/github-dark.min.css" />
+  </head>
+  <body>
+    <div id="root">
+      <div class="boot">loading…</div>
+    </div>
+    <script type="module" src="/assets/app.js?token=__REASONIX_TOKEN__"></script>
+  </body>
+</html>

docs/ARCHITECTURE.md

@@ -6,7 +6,11 @@ Reasonix is **opinionated, not general**. Every abstraction is justified by a
 DeepSeek-specific behavior or economic property. If it's generic, we don't
 ship it.
 
-## The three pillars
+The product north star: **coding agent that stays cheap enough to leave on**.
+A tool that quietly burns $200/month on a background project is one nobody
+uses. Every subsystem below is answerable to that goal.
+
+## The four pillars
 
 ### Pillar 1 — Cache-First Loop
 
@@ -37,49 +41,29 @@ timestamps each turn — cache hit rate in practice: <20%.
    into the log.
 
 **Metric.** `prompt_cache_hit_tokens / (hit + miss)` exposed per-turn and
-aggregated per-session. This is the user-visible proof of Pillar 1's value.
+aggregated per-session. Visible in the TUI's top-bar cache cell.
 
-### Pillar 2 — R1 Thought Harvesting *(v0.0.3, opt-in)*
+### Pillar 2 — R1 Thought Harvesting *(opt-in)*
 
-**Problem.** R1 emits extensive `reasoning_content`. DeepSeek's own docs
-recommend *not* feeding it back to the next turn. Most frameworks display it
-to the user and discard. The planning signal inside is lost.
+**Problem.** R1 / V4-thinking emits extensive `reasoning_content`. DeepSeek's
+own docs recommend *not* feeding it back to the next turn. Most frameworks
+display it to the user and discard. The planning signal inside is lost.
 
 **Solution.** A two-stage process:
 
 ```
-R1 output → Harvester (V3, cheap) → TypedPlanState
-                                     ├─ subgoals: string[]
-                                     ├─ hypotheses: string[]
-                                     ├─ uncertainties: string[]
-                                     └─ rejectedPaths: string[]
+R1 output → Harvester (v4-flash, thinking off) → TypedPlanState
+                                                  ├─ subgoals: string[]
+                                                  ├─ hypotheses: string[]
+                                                  ├─ uncertainties: string[]
+                                                  └─ rejectedPaths: string[]
 ```
 
-The harvester is a cheap V3 call with a strict JSON schema. Output is
-validated at runtime. The typed state is queryable by the orchestrator — e.g.
-"if `uncertainties.length > 2`, trigger branch sampling."
+The harvester is a cheap flash call with a strict JSON schema. Output is
+validated at runtime. **Not enabled in any preset** (see Pillar 4) — the
+additional round-trip rarely pays back, so it's `/harvest on` opt-in.
 
-### Branch-and-Select *(v0.0.5, opt-in, builds on Pillar 2)*
-
-**Why now.** DeepSeek is cheap enough that running N=3 R1 samples is still
-cheaper than a single Claude call. What was research luxury (self-consistency
-sampling) becomes a practical default.
-
-**How.** When `--branch N` (or `{ branch: N }` in code) is passed:
-
-1. The turn is forced non-streaming (N samples must complete before we can
-   compare).
-2. `runBranches` fires N `client.chat` calls in parallel, spreading
-   temperatures across `[0, 1]` to diversify reasoning paths.
-3. Each sample's `reasoning_content` is piped through Pillar 2's harvest.
-4. The default selector picks the sample with the fewest `uncertainties`;
-   ties are broken by shorter answer length (Occam).
-5. The loop emits a `branch_summary` alongside the winning `assistant_final`.
-
-**Cost.** 3× R1 on a hard math problem ≈ \$0.02 — still dominates Claude on
-cost/quality for agentic work.
-
-### Pillar 3 — Tool-Call Repair *(v0.0.1 ships complete)*
+### Pillar 3 — Tool-Call Repair
 
 **Problem.** Empirical DeepSeek failure modes:
 - Tool-call JSON emitted inside `<think>`, missing from the final message.
@@ -92,7 +76,6 @@ cost/quality for agentic work.
 1. **`flatten`** — schemas with >10 leaf params or depth >2 are auto-detected
    on `ToolRegistry.register()` and presented to the model in dot-notation
    form. `dispatch()` re-nests the args before calling the user's `fn`.
-   Opt out with `new ToolRegistry({ autoFlatten: false })`.
 2. **`scavenge`** — regex + JSON parser sweeps `reasoning_content` for any tool
    call the model forgot to emit in `tool_calls`.
 3. **`truncation`** — detect unbalanced JSON and repair by closing braces or
@@ -100,48 +83,169 @@ cost/quality for agentic work.
 4. **`storm`** — identical `(tool, args)` tuple within a sliding window →
    suppress the call, inject a reflection turn.
 
+### Pillar 4 — Cost Control *(v0.6)*
+
+**Problem.** Coding agents that default to the frontier model (v4-pro, ~12×
+flash cost) and accumulate full tool results in context are $150-$250/month
+for active users. Most turns don't need frontier reasoning; most sessions
+re-pay for tool results that were only useful once.
+
+**Solution.** Four complementary mechanisms, none of which require manual
+tuning in the common case:
+
+#### 4.1 Tiered defaults (flash-first)
+
+The three presets now trade only **model tier** and **reasoning effort**:
+
+| Preset | Model | Effort | Harvest | Branch | Cost |
+|---|---|---|---|---|---:|
+| `fast` | `v4-flash` | `high` | off | 1 | 1× |
+| `smart` (default) | `v4-flash` | `max` | off | 1 | ~1.5× |
+| `max` | `v4-pro` | `max` | off | 1 | ~12× |
+
+**Branching and harvest are never in a preset.** Both multiply cost and
+rarely pay back; `/branch N` and `/harvest on` are pure opt-ins. A user can
+run for weeks without ever touching them.
+
+All auxiliary calls — `forceSummaryAfterIterLimit`, subagent spawns,
+truncation repair retries — hard-code `v4-flash + effort=high` regardless
+of the user's preset. There's no reason to pay pro rates for "paraphrase
+these tool results into prose" or for an `explore` subagent's grep chain.
+
+#### 4.2 Turn-end auto-compaction
+
+Every tool result in the log exceeding `TURN_END_RESULT_CAP_TOKENS` (3000)
+is shrunk to that cap when a turn ends. The model had the full text for
+the turn that read it; subsequent turns see a compact summary and can
+re-read if needed. One extra `read_file` call is vastly cheaper than
+dragging 12KB through every future prompt.
+
+A proactive 40% context-ratio threshold runs the same shrink pre-emptively
+inside long multi-iter turns before the 80% emergency threshold fires.
+
+#### 4.3 `/pro` single-turn arming
+
+Users who predict a hard task type `/pro`; the **next** turn runs on
+`v4-pro`, then auto-disarms. No preset churn, no forgotten revert. Armed
+state is visible as a yellow `⇧ pro armed` pill in the header.
+
+#### 4.4 Failure-signal auto-escalation
+
+The loop counts visible "flash is struggling" events per turn:
+- `edit_file` / `write_file` SEARCH-not-found errors
+- ToolCallRepair fires (scavenge / truncation-fix / storm-break)
+
+Once the count hits `FAILURE_ESCALATION_THRESHOLD` (3), the **remainder of
+the current turn** runs on `v4-pro`. Announced via a yellow warning row —
+no silent cost surprises. Counter + escalation flag reset at every turn
+start.
+
+Header shows a red `⇧ pro escalated` pill while the turn is on pro.
+
+#### Cost transparency
+
+Per-turn and session cost are colored in the StatsPanel:
+- `turn $0.003` — green <$0.05, yellow $0.05–0.20, red ≥$0.20
+- `session $0.12` — same scale ×10
+
 ## Module layout
 
 ```
 src/
-├── client.ts          # httpx-equivalent DeepSeek client (fetch + SSE)
-├── loop.ts            # Pillar 1: Cache-First Loop (async iterator)
-├── harvest.ts         # Pillar 2 stub (v0.0.1 surface only)
-├── repair/
-│   ├── index.ts       # Pillar 3 pipeline
+├── client.ts               # DeepSeek client (fetch + SSE)
+├── loop.ts                 # Pillar 1 + 4 — CacheFirstLoop
+├── harvest.ts              # Pillar 2 — flash-backed plan-state extraction
+├── repair/                 # Pillar 3 pipeline
+│   ├── index.ts
 │   ├── scavenge.ts
 │   ├── flatten.ts
 │   ├── truncation.ts
 │   └── storm.ts
-├── tools.ts           # Tool registry + dispatch
-├── memory.ts          # Prefix / Log / Scratch primitives
-├── telemetry.ts       # Cost & cache-hit accounting
-├── types.ts           # Shared type definitions
-├── index.ts           # Library barrel export
+├── prompt-fragments.ts     # TUI_FORMATTING_RULES, NEGATIVE_CLAIM_RULE —
+│                           #   reused by main + subagent + skill prompts
+├── code/prompt.ts          # reasonix code main system prompt
+├── tools/                  # Tool implementations
+│   ├── filesystem.ts       # read / list / search / edit / write
+│   ├── shell.ts            # run_command + run_background (JobRegistry)
+│   ├── jobs.ts             # background-process registry
+│   ├── memory.ts           # remember / forget / list user memories
+│   ├── skills.ts           # list + invoke SKILL.md playbooks
+│   ├── subagent.ts         # spawn_subagent — flash+high by default
+│   ├── plan.ts             # submit_plan (review gate)
+│   └── web.ts              # web_search, web_fetch
+├── mcp/                    # MCP client + bridge (stdio + SSE)
+├── memory.ts               # ImmutablePrefix / AppendOnlyLog / VolatileScratch
+├── project-memory.ts       # REASONIX.md loader
+├── user-memory.ts          # ~/.reasonix/memory/ store (project + global)
+├── skills.ts               # built-in explore + research skills
+├── session.ts              # JSONL session persistence
+├── telemetry.ts            # cost + cache-hit accounting + SessionSummary
+├── tokenizer.ts            # DeepSeek V3 tokenizer (ported)
+├── usage.ts                # ~/.reasonix/usage.jsonl roll-up
+├── types.ts                # ChatMessage, ToolCall, ToolSpec
+├── index.ts                # library barrel
 └── cli/
-    ├── index.ts       # commander entry
-    ├── commands/      # chat, run, stats, version
-    └── ui/            # Ink React components (App, StatsPanel, EventLog, PromptInput)
+    ├── index.ts            # commander entry
+    ├── resolve.ts          # config + CLI flag precedence
+    ├── commands/           # chat, code, run, stats, sessions, ...
+    └── ui/
+        ├── App.tsx                  # root Ink component (~1984 LOC, was 2931)
+        ├── LiveRows.tsx             # spinner rows (OngoingTool / Status / ...)
+        ├── EventLog.tsx             # Historical row rendering
+        ├── StatsPanel.tsx           # top bar + cost badges
+        ├── PromptInput.tsx          # cursor-aware multi-line input
+        ├── PlanConfirm.tsx          # submit_plan review modal
+        ├── ShellConfirm.tsx         # run_command approval modal
+        ├── EditConfirm.tsx          # per-edit review modal
+        ├── markdown.tsx             # Ink-native markdown renderer
+        ├── edit-history.ts          # EditHistoryEntry + formatters
+        ├── useEditHistory.ts        # /undo, /history, /show state machine
+        ├── useCompletionPickers.ts  # slash, @, slash-arg pickers
+        ├── useSessionInfo.ts        # balance + models + updates fetch
+        ├── useSubagent.ts           # subagent sink wiring
+        └── slash/                   # /-command implementation
+            ├── types.ts             # SlashContext, SlashResult, ...
+            ├── commands.ts          # SLASH_COMMANDS data + parse + suggest
+            ├── helpers.ts           # git, memory, token formatters
+            ├── dispatch.ts          # registry + handleSlash lookup
+            └── handlers/            # per-topic: basic, mcp, memory,
+                                     # skill, admin, observability, edits,
+                                     # jobs, sessions, model (/pro lives here)
 ```
 
-## Roadmap
+Files kept small by design: the largest module under `cli/ui/` is 2K
+lines (App.tsx), every handler under `slash/handlers/` is ≤200 lines,
+every hook under `cli/ui/` is ≤310 lines. Adding a new slash command
+means editing one handler file and one registry line.
 
-- **v0.0.1** — Pillar 1 end-to-end, Pillar 3 complete, Ink TUI, τ-bench scaffold.
-- **v0.0.2** — First-run key prompt, saved to `~/.reasonix/config.json`.
-- **v0.0.3** — Pillar 2 MVP (opt-in harvest), retry layer, TextInput fix.
-- **v0.0.4** — Schema flatten auto-applied in ToolRegistry (closes Pillar 3).
-- **v0.0.5** — Self-consistency branching (`--branch N`) driven by Pillar 2
-  plan-state uncertainty count.
-- **v0.0.6** — Named session persistence (`--session <name>`), JSONL log
-  stored under `~/.reasonix/sessions/`, restored into the append-only log
-  on resume.
+## Design evolution
+
+- **v0.0.x** — Pillar 1 end-to-end, Pillar 3 complete, Ink TUI scaffold.
 - **v0.1** — τ-bench numbers published, streaming polish, transcript replay.
 - **v0.2** — Self-consistency / branch-budget sampling driven by plan state.
-- **v0.3** — MCP client, session persistence.
+- **v0.3** — MCP client (stdio + SSE), session persistence.
+- **v0.4.x** — `reasonix code` with SEARCH/REPLACE edits, review/auto
+  gate, background jobs, hooks.
+- **v0.5.x** — V4 model support, skills, memory, subagents, actionable
+  error messages.
+- **v0.6** *(current)* —
+  - **Pillar 4 cost control** (flash-first defaults, auto-compaction,
+    `/pro` one-shot, failure-triggered escalation, cost badges).
+  - `deepseek-chat` / `deepseek-reasoner` scheduled for deprecation —
+    all user-facing surfaces updated to `v4-flash` / `v4-pro`.
+  - `branch` + `harvest` removed from every preset; manual opt-in only.
+  - Shared prompt fragments (`TUI_FORMATTING_RULES`, `NEGATIVE_CLAIM_RULE`).
+  - UI refactor: App.tsx split into 6 hooks/components, slash.ts split
+    into 13 per-topic modules.
 
 ## Explicit non-goals
 
-- Multi-agent orchestration.
+- Multi-agent orchestration as a first-class concept (subagents are a
+  cost-reduction mechanism, not a coordination primitive).
 - RAG / vector retrieval.
-- Support for non-DeepSeek backends.
+- Support for non-DeepSeek backends (an OpenAI-compatible shim would
+  work today via `--model` override, but is not tested).
 - Web UI / SaaS.
+- Automatic cost escalation without user-visible announcement. Every
+  pro-tier model call is surfaced; silent escalation was considered
+  and rejected.

docs/favicon.svg

@@ -0,0 +1,12 @@
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+  <defs>
+    <linearGradient id="g" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#5eead4"/>
+      <stop offset="50%" stop-color="#93c5fd"/>
+      <stop offset="100%" stop-color="#c4b5fd"/>
+    </linearGradient>
+  </defs>
+  <rect width="64" height="64" rx="12" fill="#0a0d14"/>
+  <path d="M 32,10 L 54,32 L 32,54 L 10,32 Z" fill="none" stroke="url(#g)" stroke-width="3" stroke-linejoin="round"/>
+  <path d="M 32,21 L 43,32 L 32,43 L 21,32 Z" fill="url(#g)" opacity="0.9"/>
+</svg>

docs/i18n.js

@@ -0,0 +1,462 @@
+// Reasonix landing — i18n auto-switch (en / zh).
+// Detection precedence: ?lang=xx → localStorage → navigator.language → "en".
+// Falls back gracefully when localStorage is unavailable (private mode, etc).
+
+(function () {
+  "use strict";
+
+  const STORAGE_KEY = "reasonix.lang";
+  const DEFAULT_LANG = "en";
+  const SUPPORTED = ["en", "zh"];
+
+  const translations = {
+    en: {
+      "nav.features": "Features",
+      "nav.quickstart": "Quick start",
+      "nav.benchmarks": "Benchmarks",
+      "nav.github": "GitHub",
+
+      "hero.badge": "v{version} · DeepSeek V4 · cache-first",
+      "hero.title.line1": "DeepSeek-native",
+      "hero.title.line2": "AI coding agent in your terminal",
+      "hero.sub":
+        "Cache-first agent loop for DeepSeek V4 (flash + pro). Edits files as reviewable SEARCH/REPLACE blocks. Ink TUI. MCP first-class. No LangChain.",
+      "hero.copy": "Copy",
+      "hero.copy.done": "Copied",
+      "hero.cta.start": "Get started →",
+      "hero.cta.star": "Star on GitHub",
+      "hero.stat.cache": "prefix cache hit rate",
+      "hero.stat.cost": "cheaper vs Claude Sonnet 4.6",
+      "hero.stat.pass": "τ-bench-lite pass rate",
+
+      "term.user":
+        "users.ts findByEmail is case-sensitive — login fails for users with uppercase emails",
+      "term.found":
+        "▸ Found it. findByEmail uses === directly. Switch to lowercase normalization.",
+      "term.pending": "▸ 1 pending edit · /apply to write · /discard to drop",
+
+      "why.title": "Why Reasonix",
+      "why.sub":
+        "Every abstraction earns its weight against a DeepSeek-specific property — dirt-cheap tokens, R1 traces, automatic prefix caching, JSON mode. Generic wrappers leave these on the table.",
+      "why.cache.title": "Cache-first loop",
+      "why.cache.body":
+        "Append-only conversation log keeps the prompt prefix byte-stable across turns, so DeepSeek's automatic cache hits 85–95% — not 40%.",
+      "why.cost.title": "Cost is a pillar",
+      "why.cost.body":
+        "Flash-first defaults, turn-end auto-compaction, model self-escalation when (and only when) needed. Per-turn cost badge in the TUI.",
+      "why.tui.title": "Ink TUI, no web",
+      "why.tui.body":
+        "Lives in your terminal. Streaming preview, slash commands, plan picker, edit-confirm modal. Plain mode for stubborn Windows shells.",
+      "why.mcp.title": "MCP first-class",
+      "why.mcp.body":
+        "Stdio + HTTP+SSE transports. Live progress notifications. Same cache-safety + repair plumbing as native tools.",
+      "why.safe.title": "Reviewable edits",
+      "why.safe.body":
+        "Edits arrive as SEARCH/REPLACE blocks; nothing hits disk until /apply. Per-file diff confirm modal, undo history, sandboxed paths.",
+      "why.ctx.title": "1M-token aware",
+      "why.ctx.body":
+        "Context gauge with proactive compaction, oversized tool-result repair, forced-summary fallback near the window edge.",
+
+      "qs.title": "Quick start (60 seconds)",
+      "qs.step1.title": "Get a DeepSeek API key",
+      "qs.step1.body":
+        'Free credit on signup at <a href="https://platform.deepseek.com/api_keys" target="_blank" rel="noopener">platform.deepseek.com</a>.',
+      "qs.step2.title": "Point it at a project",
+      "qs.step2.body": "No install needed.",
+      "qs.step2.note":
+        "First run walks you through a 30-second wizard (paste API key → pick preset → pick MCP servers).",
+      "qs.step3.title": "Ask it to edit",
+      "qs.step3.body":
+        "The model proposes edits as SEARCH/REPLACE blocks — nothing hits disk until you <code>/apply</code>.",
+      "qs.req":
+        "Requires Node ≥ 20.10. macOS, Linux, Windows (PowerShell · Git Bash · Windows Terminal). Press <kbd>Esc</kbd> anytime to abort; <code>/help</code> for the full command list.",
+
+      "feat.title": "In the box",
+      "feat.code.title": "Pair programmer mode",
+      "feat.code.body":
+        "<code>read_file</code> · <code>write_file</code> · <code>edit_file</code> · <code>search_files</code> · <code>directory_tree</code> · <code>run_command</code> with read-only allowlist. Sandboxed to the launch root — no path escapes. Plan mode and per-edit review modal.",
+      "feat.memory.title": "Two-layer memory",
+      "feat.memory.body":
+        "Committable <code>REASONIX.md</code> for team conventions plus a private per-user <code>~/.reasonix/memory/</code> with global and per-project scopes. The model can write to it via the <code>remember</code> tool.",
+      "feat.skills.title": "User-authored prompt packs",
+      "feat.skills.body":
+        "Drop <code>SKILL.md</code> files anywhere. Names + descriptions are pinned in the prefix; the model picks them autonomously, or you trigger with <code>/skill name</code>.",
+      "feat.hooks.title": "Lifecycle hooks",
+      "feat.hooks.body":
+        "Shell commands fire at <code>PreToolUse</code> · <code>PostToolUse</code> · <code>UserPromptSubmit</code> · <code>Stop</code>. Exit code drives pass / block / warn.",
+      "feat.mcp.title": "Bring your own tools",
+      "feat.mcp.body":
+        'Wizard catalog, or <code>--mcp "name=cmd"</code> to attach stdio / HTTP+SSE servers on the fly. Live progress bars on long calls.',
+      "feat.web.title": "Web search built-in",
+      "feat.web.body":
+        "<code>web_search</code> + <code>web_fetch</code> via Mojeek — no key, no signup, off-by-flag for offline / CI. Bring-your-own provider via the <code>WebSearchProvider</code> interface.",
+
+      "bench.title": "Verify the cache claim yourself",
+      "bench.sub":
+        "On the same τ-bench-lite workload (8 multi-turn tool-use tasks × 3 repeats = 48 runs per side), live DeepSeek <code>deepseek-chat</code>, sole variable prefix stability:",
+      "bench.col.metric": "metric",
+      "bench.col.baseline": "baseline (cache-hostile)",
+      "bench.col.reasonix": "Reasonix",
+      "bench.col.delta": "delta",
+      "bench.row.cache": "cache hit",
+      "bench.row.cost": "cost / task",
+      "bench.row.pass": "pass rate",
+      "bench.repro.intro": "Reproduce without spending an API credit:",
+      "bench.repro.note":
+        "The committed JSONL transcripts carry per-turn <code>usage</code>, <code>cost</code>, and <code>prefixHash</code>. Reasonix's prefix hash stays byte-stable across every model call.",
+
+      "cli.title": "CLI at a glance",
+      "cli.code": "coding mode scoped to path",
+      "cli.chat": "chat (uses saved config)",
+      "cli.setup": "reconfigure the wizard",
+      "cli.run": "one-shot, streams to stdout",
+      "cli.stats": "cross-session cost dashboard",
+      "cli.mcp": "probe a single MCP server",
+      "cli.flags.intro": "Common flags:",
+      "cli.f.preset": "model + harvest + branch bundle",
+      "cli.f.model": "explicit DeepSeek model id",
+      "cli.f.mcp": "attach an MCP server (repeatable)",
+      "cli.f.session": "named session",
+      "cli.f.noconf": "ignore ~/.reasonix/config.json (CI)",
+
+      "ctab.title": "Ready to try?",
+      "ctab.sub": "One <code>npx</code> away. Sandboxed. Reviewable. 96% cheaper.",
+      "ctab.gh": "GitHub repository →",
+      "ctab.npm": "npm package",
+
+      "foot.tag": "DeepSeek does deep, deeply.",
+      "foot.col.project": "Project",
+      "foot.col.docs": "Docs",
+      "foot.col.community": "Community",
+      "foot.changelog": "Changelog",
+      "foot.readme": "README",
+      "foot.readme.zh": "中文 README",
+      "foot.arch": "Architecture",
+      "foot.issues": "Issues",
+      "foot.discuss": "Discussions",
+      "foot.copyright": "© 2026 Reasonix · MIT License",
+    },
+
+    zh: {
+      "nav.features": "特性",
+      "nav.quickstart": "快速上手",
+      "nav.benchmarks": "性能对比",
+      "nav.github": "GitHub",
+
+      "hero.badge": "v{version} · DeepSeek V4 · 缓存优先",
+      "hero.title.line1": "DeepSeek 原生",
+      "hero.title.line2": "终端里的 AI 编程代理",
+      "hero.sub":
+        "为 DeepSeek V4（flash + pro）打造的缓存优先 agent 循环。编辑以可审查的 SEARCH/REPLACE 块呈现，落盘前必须确认。Ink TUI、原生支持 MCP，不依赖 LangChain。",
+      "hero.copy": "复制",
+      "hero.copy.done": "已复制",
+      "hero.cta.start": "开始使用 →",
+      "hero.cta.star": "在 GitHub 加星",
+      "hero.stat.cache": "前缀缓存命中率",
+      "hero.stat.cost": "相比 Claude Sonnet 4.6 节省",
+      "hero.stat.pass": "τ-bench-lite 通过率",
+
+      "term.user":
+        "users.ts 里 findByEmail 对大小写敏感导致登录失败，帮我改",
+      "term.found":
+        "▸ 找到了。findByEmail 直接用 === 比对。改成小写规范化并补一条测试。",
+      "term.pending": "▸ 1 处待应用编辑 · /apply 写入 · /discard 丢弃",
+
+      "why.title": "为什么选 Reasonix",
+      "why.sub":
+        "每个抽象都对应 DeepSeek 的一个具体特性——极低 token 价、R1 推理轨迹、自动前缀缓存、JSON 模式。通用框架把这些机会全留在桌上。",
+      "why.cache.title": "缓存优先的循环",
+      "why.cache.body":
+        "对话日志只追加不重写，前缀字节级稳定，DeepSeek 的自动前缀缓存命中能稳定打到 85–95%，而不是 40%。",
+      "why.cost.title": "成本是头等公民",
+      "why.cost.body":
+        "默认 flash 优先、turn 末尾自动压缩、必要时模型自我升级到 pro。TUI 有实时单轮成本徽章。",
+      "why.tui.title": "Ink TUI，不靠浏览器",
+      "why.tui.body":
+        "完全在终端里。流式预览、斜杠命令、计划审阅、编辑确认弹窗。Windows 顽固终端可启用 plain 模式。",
+      "why.mcp.title": "原生 MCP",
+      "why.mcp.body":
+        "stdio + HTTP+SSE 双传输。长任务有实时进度条。和原生工具一样走缓存安全 + 自动修复管线。",
+      "why.safe.title": "编辑可审阅",
+      "why.safe.body":
+        "编辑以 SEARCH/REPLACE 块呈现，/apply 之前不动磁盘。逐文件 diff 确认、撤销历史、路径沙箱。",
+      "why.ctx.title": "百万 token 感知",
+      "why.ctx.body":
+        "上下文仪表 + 主动压缩、超大工具结果自动修复、贴近上限自动总结兜底。",
+
+      "qs.title": "60 秒快速上手",
+      "qs.step1.title": "获取 DeepSeek API Key",
+      "qs.step1.body":
+        '在 <a href="https://platform.deepseek.com/api_keys" target="_blank" rel="noopener">platform.deepseek.com</a> 注册即送免费额度。',
+      "qs.step2.title": "切到项目目录运行",
+      "qs.step2.body": "无需安装。",
+      "qs.step2.note":
+        "首次运行会走 30 秒向导：粘贴 API key → 选预设 → 勾选 MCP 服务器。",
+      "qs.step3.title": "让它改代码",
+      "qs.step3.body":
+        "模型会以 SEARCH/REPLACE 块的形式提出编辑——你不 <code>/apply</code>，磁盘不会被改。",
+      "qs.req":
+        "需要 Node ≥ 20.10。支持 macOS、Linux、Windows（PowerShell · Git Bash · Windows Terminal）。任何时候按 <kbd>Esc</kbd> 中断；<code>/help</code> 查看完整命令。",
+
+      "feat.title": "开箱即用",
+      "feat.code.title": "结对编程模式",
+      "feat.code.body":
+        "<code>read_file</code> · <code>write_file</code> · <code>edit_file</code> · <code>search_files</code> · <code>directory_tree</code> · 带只读白名单的 <code>run_command</code>。沙箱限定在启动目录——路径逃逸一律拒绝。支持 plan 模式与逐次编辑确认弹窗。",
+      "feat.memory.title": "两层记忆系统",
+      "feat.memory.body":
+        "可提交的 <code>REASONIX.md</code> 承载团队约定，私人 <code>~/.reasonix/memory/</code> 分全局与按项目两个作用域。模型可通过 <code>remember</code> 工具自行写入。",
+      "feat.skills.title": "用户定义的 prompt 包",
+      "feat.skills.body":
+        "把 <code>SKILL.md</code> 丢进任意位置。名字 + 描述会被钉在前缀里，模型可自动调用，或你用 <code>/skill name</code> 手动触发。",
+      "feat.hooks.title": "生命周期钩子",
+      "feat.hooks.body":
+        "在 <code>PreToolUse</code> · <code>PostToolUse</code> · <code>UserPromptSubmit</code> · <code>Stop</code> 四个点触发 shell 命令，退出码决定放行 / 阻断 / 警告。",
+      "feat.mcp.title": "自带工具进来",
+      "feat.mcp.body":
+        '向导内置目录，或用 <code>--mcp "name=cmd"</code> 直接挂 stdio / HTTP+SSE 服务器。长任务渲染实时进度条。',
+      "feat.web.title": "内置联网搜索",
+      "feat.web.body":
+        "<code>web_search</code> + <code>web_fetch</code>，背靠 Mojeek——无需 key、无需注册，离线 / CI 可关闭。可通过 <code>WebSearchProvider</code> 接口接入自家搜索。",
+
+      "bench.title": "缓存命中率自己也能验证",
+      "bench.sub":
+        "同一 τ-bench-lite 负载（8 个多轮工具调用任务 × 3 次重复 = 每边 48 次运行），实测 DeepSeek <code>deepseek-chat</code>，唯一变量是前缀稳定性：",
+      "bench.col.metric": "指标",
+      "bench.col.baseline": "基线（缓存敌对）",
+      "bench.col.reasonix": "Reasonix",
+      "bench.col.delta": "差值",
+      "bench.row.cache": "缓存命中",
+      "bench.row.cost": "单任务成本",
+      "bench.row.pass": "通过率",
+      "bench.repro.intro": "无需消耗 API 额度即可复现：",
+      "bench.repro.note":
+        "提交进仓库的 JSONL 文件每轮带 <code>usage</code>、<code>cost</code>、<code>prefixHash</code>。Reasonix 的前缀哈希在每次模型调用时都字节稳定。",
+
+      "cli.title": "CLI 速览",
+      "cli.code": "针对指定路径的编程模式",
+      "cli.chat": "聊天模式（读取已保存配置）",
+      "cli.setup": "重新跑配置向导",
+      "cli.run": "一次性运行，结果流到 stdout",
+      "cli.stats": "跨会话的成本仪表盘",
+      "cli.mcp": "探测单个 MCP 服务器",
+      "cli.flags.intro": "常用 flag：",
+      "cli.f.preset": "模型 + harvest + 分支并行 一键组合",
+      "cli.f.model": "显式指定 DeepSeek 模型 ID",
+      "cli.f.mcp": "挂载 MCP 服务器（可重复）",
+      "cli.f.session": "命名会话",
+      "cli.f.noconf": "忽略 ~/.reasonix/config.json（CI 友好）",
+
+      "ctab.title": "准备好了吗？",
+      "ctab.sub": "一条 <code>npx</code> 即可开始。沙箱、可审阅、便宜 96%。",
+      "ctab.gh": "GitHub 仓库 →",
+      "ctab.npm": "npm 包",
+
+      "foot.tag": "Reasonix 只做 DeepSeek，做到底。",
+      "foot.col.project": "项目",
+      "foot.col.docs": "文档",
+      "foot.col.community": "社区",
+      "foot.changelog": "更新日志",
+      "foot.readme": "英文 README",
+      "foot.readme.zh": "中文 README",
+      "foot.arch": "架构文档",
+      "foot.issues": "问题反馈",
+      "foot.discuss": "讨论区",
+      "foot.copyright": "© 2026 Reasonix · MIT 协议",
+    },
+  };
+
+  function safeStorageGet(key) {
+    try {
+      return window.localStorage.getItem(key);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  function safeStorageSet(key, value) {
+    try {
+      window.localStorage.setItem(key, value);
+    } catch (_) {
+      /* ignore */
+    }
+  }
+
+  function detectLang() {
+    const params = new URLSearchParams(window.location.search);
+    const queryLang = params.get("lang");
+    if (queryLang && SUPPORTED.includes(queryLang)) return queryLang;
+
+    const stored = safeStorageGet(STORAGE_KEY);
+    if (stored && SUPPORTED.includes(stored)) return stored;
+
+    const navLang = (navigator.language || navigator.userLanguage || "").toLowerCase();
+    if (navLang.startsWith("zh")) return "zh";
+
+    if (Array.isArray(navigator.languages)) {
+      for (const l of navigator.languages) {
+        if (l && l.toLowerCase().startsWith("zh")) return "zh";
+      }
+    }
+
+    return DEFAULT_LANG;
+  }
+
+  let currentLang = DEFAULT_LANG;
+  const langListeners = [];
+
+  // Version is rendered into translation strings via a `{version}` token
+  // (see hero.badge). Source of truth is npm — `loadVersion()` fetches
+  // it on page load and re-applies translations. Until that resolves
+  // we fall back to the most recently cached value, then to a baked-in
+  // default. Only places this constant matters: the user is offline AND
+  // visits the site for the first time. Bumping it occasionally on
+  // major version cuts is fine; the npm fetch handles everything else.
+  const VERSION_STORAGE_KEY = "reasonix.version";
+  const VERSION_FALLBACK = "0.12";
+  const versionListeners = [];
+  let currentVersion = VERSION_FALLBACK;
+
+  function applyVersion(v) {
+    if (typeof v !== "string" || !v || v === currentVersion) return;
+    currentVersion = v;
+    safeStorageSet(VERSION_STORAGE_KEY, v);
+    applyLang(currentLang); // re-render any `{version}` tokens
+    for (const fn of versionListeners) {
+      try {
+        fn(v);
+      } catch (_) {
+        /* ignore */
+      }
+    }
+  }
+
+  async function loadVersion() {
+    try {
+      const r = await fetch("https://registry.npmjs.org/reasonix/latest", {
+        cache: "no-cache",
+      });
+      if (!r.ok) return;
+      const data = await r.json();
+      if (data && typeof data.version === "string") applyVersion(data.version);
+    } catch (_) {
+      /* offline / firewall — keep cached or fallback */
+    }
+  }
+
+  function fillVersion(s) {
+    return typeof s === "string" ? s.replace(/\{version\}/g, currentVersion) : s;
+  }
+
+  function applyLang(lang) {
+    if (!SUPPORTED.includes(lang)) lang = DEFAULT_LANG;
+    const changed = lang !== currentLang;
+    currentLang = lang;
+    const dict = translations[lang];
+
+    document.documentElement.lang = lang === "zh" ? "zh-CN" : "en";
+    document.documentElement.setAttribute("data-lang", lang);
+
+    document.querySelectorAll("[data-i18n]").forEach((el) => {
+      const key = el.getAttribute("data-i18n");
+      if (dict[key] !== undefined) {
+        el.innerHTML = fillVersion(dict[key]);
+      }
+    });
+
+    document.querySelectorAll("[data-lang-btn]").forEach((btn) => {
+      const isActive = btn.getAttribute("data-lang-btn") === lang;
+      btn.setAttribute("aria-pressed", isActive ? "true" : "false");
+    });
+
+    safeStorageSet(STORAGE_KEY, lang);
+
+    if (changed) {
+      for (const fn of langListeners) {
+        try {
+          fn(lang);
+        } catch (_) {
+          /* ignore */
+        }
+      }
+    }
+  }
+
+  // Public API for sibling scripts (term-anim.js).
+  window.Reasonix = window.Reasonix || {};
+  window.Reasonix.t = function (key) {
+    const dict = translations[currentLang] || translations[DEFAULT_LANG];
+    return dict[key];
+  };
+  window.Reasonix.lang = function () {
+    return currentLang;
+  };
+  window.Reasonix.onLangChange = function (fn) {
+    if (typeof fn === "function") langListeners.push(fn);
+  };
+  window.Reasonix.version = function () {
+    return currentVersion;
+  };
+  window.Reasonix.onVersionChange = function (fn) {
+    if (typeof fn === "function") versionListeners.push(fn);
+  };
+
+  function wireLangButtons() {
+    document.querySelectorAll("[data-lang-btn]").forEach((btn) => {
+      btn.addEventListener("click", () => {
+        applyLang(btn.getAttribute("data-lang-btn"));
+      });
+    });
+  }
+
+  function wireCopyButtons() {
+    document.querySelectorAll("[data-copy]").forEach((btn) => {
+      btn.addEventListener("click", async () => {
+        const text = btn.getAttribute("data-copy");
+        try {
+          await navigator.clipboard.writeText(text);
+        } catch (_) {
+          const ta = document.createElement("textarea");
+          ta.value = text;
+          ta.style.position = "fixed";
+          ta.style.opacity = "0";
+          document.body.appendChild(ta);
+          ta.select();
+          try {
+            document.execCommand("copy");
+          } catch (_) {
+            /* ignore */
+          }
+          document.body.removeChild(ta);
+        }
+        const lang = document.documentElement.getAttribute("data-lang") || DEFAULT_LANG;
+        const original = translations[lang]["hero.copy"] || "Copy";
+        const done = translations[lang]["hero.copy.done"] || "Copied";
+        btn.textContent = done;
+        btn.classList.add("copied");
+        setTimeout(() => {
+          btn.textContent = original;
+          btn.classList.remove("copied");
+        }, 1600);
+      });
+    });
+  }
+
+  function init() {
+    // Use the cached npm version (if any) so the badge isn't visibly
+    // wrong on first paint; fall back to the baked-in default. Then
+    // fire off the live fetch — when it resolves, applyVersion()
+    // re-applies translations and notifies subscribers (term-anim).
+    const cached = safeStorageGet(VERSION_STORAGE_KEY);
+    if (typeof cached === "string" && /^\d+\.\d+/.test(cached)) currentVersion = cached;
+    applyLang(detectLang());
+    wireLangButtons();
+    wireCopyButtons();
+    loadVersion();
+  }
+
+  if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", init);
+  } else {
+    init();
+  }
+})();

docs/index.html

@@ -0,0 +1,493 @@
+<!doctype html>
+<html lang="en" data-lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Reasonix — DeepSeek-native AI coding agent</title>
+    <meta
+      name="description"
+      content="Cache-first agent loop for DeepSeek V4. Ink TUI. MCP first-class. 94%+ prefix cache hit, ~96% cheaper than Claude on the same workload. No LangChain."
+    />
+    <meta name="theme-color" content="#0b0f17" />
+
+    <meta property="og:title" content="Reasonix — DeepSeek-native AI coding agent" />
+    <meta
+      property="og:description"
+      content="Cache-first agent loop for DeepSeek V4 (flash + pro). Ink TUI. MCP first-class. No LangChain."
+    />
+    <meta property="og:type" content="website" />
+    <meta property="og:url" content="https://esengine.github.io/reasonix/" />
+    <meta property="og:image" content="https://raw.githubusercontent.com/esengine/reasonix/main/docs/logo.svg" />
+    <meta name="twitter:card" content="summary_large_image" />
+
+    <link rel="icon" type="image/svg+xml" href="favicon.svg" />
+    <link rel="preconnect" href="https://fonts.googleapis.com" />
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+    <link
+      href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap"
+      rel="stylesheet"
+    />
+    <link rel="stylesheet" href="styles.css" />
+  </head>
+
+  <body>
+    <div class="bg-grid" aria-hidden="true"></div>
+    <div class="bg-glow" aria-hidden="true"></div>
+
+    <header class="nav">
+      <a class="nav-brand" href="#top" aria-label="Reasonix">
+        <span class="brand-mark" aria-hidden="true">
+          <span class="diamond"></span>
+          <span class="diamond inner"></span>
+        </span>
+        <span class="brand-name">Reasonix</span>
+      </a>
+
+      <nav class="nav-links">
+        <a href="#features" data-i18n="nav.features">Features</a>
+        <a href="#quickstart" data-i18n="nav.quickstart">Quick start</a>
+        <a href="#benchmarks" data-i18n="nav.benchmarks">Benchmarks</a>
+        <a
+          href="https://github.com/esengine/reasonix"
+          target="_blank"
+          rel="noopener"
+          data-i18n="nav.github"
+          >GitHub</a
+        >
+      </nav>
+
+      <div class="nav-actions">
+        <div class="lang-switch" role="group" aria-label="Language">
+          <button data-lang-btn="en" type="button" aria-pressed="true">EN</button>
+          <button data-lang-btn="zh" type="button" aria-pressed="false">中文</button>
+        </div>
+      </div>
+    </header>
+
+    <main id="top">
+      <section class="hero">
+        <div class="hero-inner">
+          <div class="badge" data-i18n="hero.badge">v0.6 · DeepSeek V4 · cache-first</div>
+          <h1 class="hero-title">
+            <span class="grad-text" data-i18n="hero.title.line1">DeepSeek-native</span>
+            <br />
+            <span data-i18n="hero.title.line2">AI coding agent in your terminal</span>
+          </h1>
+          <p class="hero-sub" data-i18n="hero.sub">
+            Cache-first agent loop for DeepSeek V4 (flash + pro). Edits files as
+            reviewable SEARCH/REPLACE blocks. Ink TUI. MCP first-class. No LangChain.
+          </p>
+
+          <div class="hero-install">
+            <code class="install-cmd"
+              ><span class="prompt">$</span> <span class="cmd">npx reasonix code</span></code
+            >
+            <button class="copy-btn" data-copy="npx reasonix code" data-i18n="hero.copy">
+              Copy
+            </button>
+          </div>
+
+          <div class="hero-ctas">
+            <a class="cta primary" href="#quickstart" data-i18n="hero.cta.start">
+              Get started →
+            </a>
+            <a
+              class="cta ghost"
+              href="https://github.com/esengine/reasonix"
+              target="_blank"
+              rel="noopener"
+              data-i18n="hero.cta.star"
+              >Star on GitHub</a
+            >
+          </div>
+
+          <div class="hero-stats">
+            <div class="stat">
+              <div class="stat-num grad-text">94.4%</div>
+              <div class="stat-label" data-i18n="hero.stat.cache">prefix cache hit rate</div>
+            </div>
+            <div class="stat">
+              <div class="stat-num grad-text">~96%</div>
+              <div class="stat-label" data-i18n="hero.stat.cost">cheaper vs Claude Sonnet 4.6</div>
+            </div>
+            <div class="stat">
+              <div class="stat-num grad-text">100%</div>
+              <div class="stat-label" data-i18n="hero.stat.pass">τ-bench-lite pass rate</div>
+            </div>
+          </div>
+        </div>
+
+        <div class="hero-terminal" aria-hidden="true">
+          <div class="term-bar">
+            <span class="dot r"></span><span class="dot y"></span><span class="dot g"></span>
+            <span class="term-title">reasonix code</span>
+            <button class="term-replay" type="button" data-replay aria-label="replay">↻</button>
+          </div>
+          <div class="term-body" id="term-body" data-anim-root></div>
+        </div>
+      </section>
+
+      <section class="why">
+        <div class="container">
+          <h2 class="section-title" data-i18n="why.title">Why Reasonix</h2>
+          <p class="section-sub" data-i18n="why.sub">
+            Every abstraction earns its weight against a DeepSeek-specific property —
+            dirt-cheap tokens, R1 traces, automatic prefix caching, JSON mode. Generic
+            wrappers leave these on the table.
+          </p>
+
+          <div class="why-grid">
+            <article class="why-card">
+              <div class="why-icon">◈</div>
+              <h3 data-i18n="why.cache.title">Cache-first loop</h3>
+              <p data-i18n="why.cache.body">
+                Append-only conversation log keeps the prompt prefix byte-stable across
+                turns, so DeepSeek's automatic cache hits 85–95% — not 40%.
+              </p>
+            </article>
+            <article class="why-card">
+              <div class="why-icon">¥</div>
+              <h3 data-i18n="why.cost.title">Cost is a pillar</h3>
+              <p data-i18n="why.cost.body">
+                Flash-first defaults, turn-end auto-compaction, model self-escalation
+                when (and only when) needed. Per-turn cost badge in the TUI.
+              </p>
+            </article>
+            <article class="why-card">
+              <div class="why-icon">⌨</div>
+              <h3 data-i18n="why.tui.title">Ink TUI, no web</h3>
+              <p data-i18n="why.tui.body">
+                Lives in your terminal. Streaming preview, slash commands, plan picker,
+                edit-confirm modal. Plain mode for stubborn Windows shells.
+              </p>
+            </article>
+            <article class="why-card">
+              <div class="why-icon">⊕</div>
+              <h3 data-i18n="why.mcp.title">MCP first-class</h3>
+              <p data-i18n="why.mcp.body">
+                Stdio + HTTP+SSE transports. Live progress notifications. Same
+                cache-safety + repair plumbing as native tools.
+              </p>
+            </article>
+            <article class="why-card">
+              <div class="why-icon">↶</div>
+              <h3 data-i18n="why.safe.title">Reviewable edits</h3>
+              <p data-i18n="why.safe.body">
+                Edits arrive as SEARCH/REPLACE blocks; nothing hits disk until /apply.
+                Per-file diff confirm modal, undo history, sandboxed paths.
+              </p>
+            </article>
+            <article class="why-card">
+              <div class="why-icon">∞</div>
+              <h3 data-i18n="why.ctx.title">1M-token aware</h3>
+              <p data-i18n="why.ctx.body">
+                Context gauge with proactive compaction, oversized tool-result repair,
+                forced-summary fallback near the window edge.
+              </p>
+            </article>
+          </div>
+        </div>
+      </section>
+
+      <section id="quickstart" class="quickstart">
+        <div class="container">
+          <h2 class="section-title" data-i18n="qs.title">Quick start (60 seconds)</h2>
+          <ol class="qs-steps">
+            <li>
+              <h3 data-i18n="qs.step1.title">Get a DeepSeek API key</h3>
+              <p data-i18n="qs.step1.body">
+                Free credit on signup at
+                <a href="https://platform.deepseek.com/api_keys" target="_blank" rel="noopener"
+                  >platform.deepseek.com</a
+                >.
+              </p>
+            </li>
+            <li>
+              <h3 data-i18n="qs.step2.title">Point it at a project</h3>
+              <p data-i18n="qs.step2.body">No install needed.</p>
+              <pre class="code"><code>cd my-project
+npx reasonix code</code></pre>
+              <p data-i18n="qs.step2.note">
+                First run walks you through a 30-second wizard (paste API key → pick
+                preset → pick MCP servers).
+              </p>
+            </li>
+            <li>
+              <h3 data-i18n="qs.step3.title">Ask it to edit</h3>
+              <p data-i18n="qs.step3.body">
+                The model proposes edits as SEARCH/REPLACE blocks — nothing hits disk
+                until you <code>/apply</code>.
+              </p>
+            </li>
+          </ol>
+
+          <p class="req" data-i18n="qs.req">
+            Requires Node ≥ 20.10. macOS, Linux, Windows (PowerShell · Git Bash · Windows
+            Terminal). Press <kbd>Esc</kbd> anytime to abort; <code>/help</code> for the
+            full command list.
+          </p>
+        </div>
+      </section>
+
+      <section id="features" class="features">
+        <div class="container">
+          <h2 class="section-title" data-i18n="feat.title">In the box</h2>
+
+          <div class="feat-grid">
+            <article class="feat">
+              <h3>
+                <span class="feat-tag">code</span>
+                <span data-i18n="feat.code.title">Pair programmer mode</span>
+              </h3>
+              <p data-i18n="feat.code.body">
+                <code>read_file</code> · <code>write_file</code> · <code>edit_file</code> ·
+                <code>search_files</code> · <code>directory_tree</code> ·
+                <code>run_command</code> with read-only allowlist. Sandboxed to the
+                launch root — no path escapes. Plan mode and per-edit review modal.
+              </p>
+            </article>
+            <article class="feat">
+              <h3>
+                <span class="feat-tag">memory</span>
+                <span data-i18n="feat.memory.title">Two-layer memory</span>
+              </h3>
+              <p data-i18n="feat.memory.body">
+                Committable <code>REASONIX.md</code> for team conventions plus a private
+                per-user <code>~/.reasonix/memory/</code> with global and per-project
+                scopes. The model can write to it via the <code>remember</code> tool.
+              </p>
+            </article>
+            <article class="feat">
+              <h3>
+                <span class="feat-tag">skills</span>
+                <span data-i18n="feat.skills.title">User-authored prompt packs</span>
+              </h3>
+              <p data-i18n="feat.skills.body">
+                Drop <code>SKILL.md</code> files anywhere. Names + descriptions are
+                pinned in the prefix; the model picks them autonomously, or you trigger
+                with <code>/skill name</code>.
+              </p>
+            </article>
+            <article class="feat">
+              <h3>
+                <span class="feat-tag">hooks</span>
+                <span data-i18n="feat.hooks.title">Lifecycle hooks</span>
+              </h3>
+              <p data-i18n="feat.hooks.body">
+                Shell commands fire at <code>PreToolUse</code> · <code>PostToolUse</code>
+                · <code>UserPromptSubmit</code> · <code>Stop</code>. Exit code drives
+                pass / block / warn.
+              </p>
+            </article>
+            <article class="feat">
+              <h3>
+                <span class="feat-tag">mcp</span>
+                <span data-i18n="feat.mcp.title">Bring your own tools</span>
+              </h3>
+              <p data-i18n="feat.mcp.body">
+                Wizard catalog, or <code>--mcp "name=cmd"</code> to attach stdio /
+                HTTP+SSE servers on the fly. Live progress bars on long calls.
+              </p>
+            </article>
+            <article class="feat">
+              <h3>
+                <span class="feat-tag">web</span>
+                <span data-i18n="feat.web.title">Web search built-in</span>
+              </h3>
+              <p data-i18n="feat.web.body">
+                <code>web_search</code> + <code>web_fetch</code> via Mojeek — no key, no
+                signup, off-by-flag for offline / CI. Bring-your-own provider via the
+                <code>WebSearchProvider</code> interface.
+              </p>
+            </article>
+          </div>
+        </div>
+      </section>
+
+      <section id="benchmarks" class="bench">
+        <div class="container">
+          <h2 class="section-title" data-i18n="bench.title">Verify the cache claim yourself</h2>
+          <p class="section-sub" data-i18n="bench.sub">
+            On the same τ-bench-lite workload (8 multi-turn tool-use tasks × 3 repeats =
+            48 runs per side), live DeepSeek <code>deepseek-chat</code>, sole variable
+            prefix stability:
+          </p>
+
+          <div class="bench-table-wrap">
+            <table class="bench-table">
+              <thead>
+                <tr>
+                  <th data-i18n="bench.col.metric">metric</th>
+                  <th data-i18n="bench.col.baseline">baseline (cache-hostile)</th>
+                  <th data-i18n="bench.col.reasonix">Reasonix</th>
+                  <th data-i18n="bench.col.delta">delta</th>
+                </tr>
+              </thead>
+              <tbody>
+                <tr>
+                  <td data-i18n="bench.row.cache">cache hit</td>
+                  <td>46.6%</td>
+                  <td class="hi">94.4%</td>
+                  <td>+47.7 pp</td>
+                </tr>
+                <tr>
+                  <td data-i18n="bench.row.cost">cost / task</td>
+                  <td>$0.002599</td>
+                  <td class="hi">$0.001579</td>
+                  <td><strong>−39%</strong></td>
+                </tr>
+                <tr>
+                  <td data-i18n="bench.row.pass">pass rate</td>
+                  <td>96% (23/24)</td>
+                  <td class="hi">100% (24/24)</td>
+                  <td>—</td>
+                </tr>
+              </tbody>
+            </table>
+          </div>
+
+          <p data-i18n="bench.repro.intro">Reproduce without spending an API credit:</p>
+          <pre class="code"><code>git clone https://github.com/esengine/reasonix.git &amp;&amp; cd reasonix &amp;&amp; npm install
+npx reasonix replay benchmarks/tau-bench/transcripts/t01_address_happy.reasonix.r1.jsonl
+npx reasonix diff \
+  benchmarks/tau-bench/transcripts/t01_address_happy.baseline.r1.jsonl \
+  benchmarks/tau-bench/transcripts/t01_address_happy.reasonix.r1.jsonl</code></pre>
+
+          <p data-i18n="bench.repro.note">
+            The committed JSONL transcripts carry per-turn <code>usage</code>,
+            <code>cost</code>, and <code>prefixHash</code>. Reasonix's prefix hash stays
+            byte-stable across every model call.
+          </p>
+        </div>
+      </section>
+
+      <section class="cli">
+        <div class="container">
+          <h2 class="section-title" data-i18n="cli.title">CLI at a glance</h2>
+          <pre class="code"><code>npx reasonix code [path]                 <span class="hash"># <span data-i18n="cli.code">coding mode scoped to path</span></span>
+npx reasonix                             <span class="hash"># <span data-i18n="cli.chat">chat (uses saved config)</span></span>
+npx reasonix setup                       <span class="hash"># <span data-i18n="cli.setup">reconfigure the wizard</span></span>
+npx reasonix run "ask anything"          <span class="hash"># <span data-i18n="cli.run">one-shot, streams to stdout</span></span>
+npx reasonix stats                       <span class="hash"># <span data-i18n="cli.stats">cross-session cost dashboard</span></span>
+npx reasonix mcp inspect &lt;spec&gt;          <span class="hash"># <span data-i18n="cli.mcp">probe a single MCP server</span></span></code></pre>
+
+          <p class="cli-flags" data-i18n="cli.flags.intro">Common flags:</p>
+          <pre class="code"><code>--preset &lt;fast|smart|max&gt;   <span class="hash"># <span data-i18n="cli.f.preset">model + harvest + branch bundle</span></span>
+--model &lt;id&gt;                <span class="hash"># <span data-i18n="cli.f.model">explicit DeepSeek model id</span></span>
+--mcp "name=cmd args…"      <span class="hash"># <span data-i18n="cli.f.mcp">attach an MCP server (repeatable)</span></span>
+--session &lt;name&gt;            <span class="hash"># <span data-i18n="cli.f.session">named session</span></span>
+--no-config                 <span class="hash"># <span data-i18n="cli.f.noconf">ignore ~/.reasonix/config.json (CI)</span></span></code></pre>
+        </div>
+      </section>
+
+      <section class="cta-band">
+        <div class="container">
+          <h2 data-i18n="ctab.title">Ready to try?</h2>
+          <p data-i18n="ctab.sub">
+            One <code>npx</code> away. Sandboxed. Reviewable. 96% cheaper.
+          </p>
+          <div class="hero-ctas center">
+            <a
+              class="cta primary"
+              href="https://github.com/esengine/reasonix"
+              target="_blank"
+              rel="noopener"
+              data-i18n="ctab.gh"
+              >GitHub repository →</a
+            >
+            <a
+              class="cta ghost"
+              href="https://www.npmjs.com/package/reasonix"
+              target="_blank"
+              rel="noopener"
+              data-i18n="ctab.npm"
+              >npm package</a
+            >
+          </div>
+        </div>
+      </section>
+    </main>
+
+    <footer class="foot">
+      <div class="container foot-inner">
+        <div>
+          <a href="#top" class="nav-brand">
+            <span class="brand-mark small" aria-hidden="true">
+              <span class="diamond"></span>
+              <span class="diamond inner"></span>
+            </span>
+            <span class="brand-name">Reasonix</span>
+          </a>
+          <p class="foot-tag" data-i18n="foot.tag">DeepSeek does deep, deeply.</p>
+        </div>
+        <div class="foot-cols">
+          <div>
+            <h4 data-i18n="foot.col.project">Project</h4>
+            <a href="https://github.com/esengine/reasonix" target="_blank" rel="noopener">GitHub</a>
+            <a href="https://www.npmjs.com/package/reasonix" target="_blank" rel="noopener">npm</a>
+            <a
+              href="https://github.com/esengine/reasonix/blob/main/CHANGELOG.md"
+              target="_blank"
+              rel="noopener"
+              data-i18n="foot.changelog"
+              >Changelog</a
+            >
+            <a
+              href="https://github.com/esengine/reasonix/blob/main/LICENSE"
+              target="_blank"
+              rel="noopener"
+              >MIT</a
+            >
+          </div>
+          <div>
+            <h4 data-i18n="foot.col.docs">Docs</h4>
+            <a
+              href="https://github.com/esengine/reasonix#readme"
+              target="_blank"
+              rel="noopener"
+              data-i18n="foot.readme"
+              >README</a
+            >
+            <a
+              href="https://github.com/esengine/reasonix/blob/main/README.zh-CN.md"
+              target="_blank"
+              rel="noopener"
+              data-i18n="foot.readme.zh"
+              >中文 README</a
+            >
+            <a
+              href="https://github.com/esengine/reasonix/blob/main/docs/ARCHITECTURE.md"
+              target="_blank"
+              rel="noopener"
+              data-i18n="foot.arch"
+              >Architecture</a
+            >
+          </div>
+          <div>
+            <h4 data-i18n="foot.col.community">Community</h4>
+            <a
+              href="https://github.com/esengine/reasonix/issues"
+              target="_blank"
+              rel="noopener"
+              data-i18n="foot.issues"
+              >Issues</a
+            >
+            <a
+              href="https://github.com/esengine/reasonix/discussions"
+              target="_blank"
+              rel="noopener"
+              data-i18n="foot.discuss"
+              >Discussions</a
+            >
+          </div>
+        </div>
+      </div>
+      <div class="foot-bottom">
+        <span data-i18n="foot.copyright">© 2026 Reasonix · MIT License</span>
+      </div>
+    </footer>
+
+    <script src="i18n.js"></script>
+    <script src="term-anim.js"></script>
+  </body>
+</html>

docs/term-anim.js

@@ -0,0 +1,420 @@
+// Hero terminal animation — simulates a `reasonix code` session using
+// the real TUI rendering primitives:
+//   ◇ / ◆ role glyphs + colored vertical accent bars
+//   ` ✓ tool_name ` pills (yellow bg, black text)
+//   EditBlockRow: rounded cyan border, filename, `- old` red / `+ new` green
+//   info rows: dim glyph + dim body (slate)
+//
+// Reads i18n strings via Reasonix.t(); restarts on language toggle.
+
+(function () {
+  "use strict";
+
+  const ROOT_SEL = "[data-anim-root]";
+  const REPLAY_SEL = "[data-replay]";
+
+  const tr = (key, fallback) => {
+    if (window.Reasonix && typeof window.Reasonix.t === "function") {
+      const v = window.Reasonix.t(key);
+      if (v !== undefined && v !== null && v !== "") return v;
+    }
+    return fallback != null ? fallback : key;
+  };
+
+  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+  function el(tag, cls, text) {
+    const n = document.createElement(tag);
+    if (cls) n.className = cls;
+    if (text != null) n.textContent = text;
+    return n;
+  }
+
+  // Brand gradient — same stops as src/cli/ui/theme.ts GRADIENT.
+  const GRADIENT = [
+    "#5eead4",
+    "#67e8f9",
+    "#7dd3fc",
+    "#93c5fd",
+    "#a5b4fc",
+    "#c4b5fd",
+    "#d8b4fe",
+    "#f0abfc",
+  ];
+
+  // ──────────────────────────────────────────────────────────────────
+  // Header bar — `◈ REASONIX v0.12.x  v4-flash  REVIEW  max  …  turn 1 · /help`
+  // Version comes from the i18n script (which fetched it from npm).
+  // Falls back to a baked-in default before the fetch lands.
+  // ──────────────────────────────────────────────────────────────────
+  function currentVersion() {
+    const r = window.Reasonix;
+    return (r && typeof r.version === "function" ? r.version() : null) || "0.12";
+  }
+
+  function buildHeader(turn) {
+    const h = el("div", "thead");
+    h.innerHTML =
+      '<span class="tw-mark">◈</span>' +
+      '<span class="tw-name">REASONIX</span>' +
+      `<span class="tw-ver">v${currentVersion()}</span>` +
+      '<span class="tw-model">v4-flash</span>' +
+      '<span class="tw-pill review">REVIEW</span>' +
+      '<span class="tw-effort">max</span>' +
+      '<span class="tw-spacer"></span>' +
+      '<span class="tw-turn">turn ' +
+      turn +
+      " · /help</span>";
+    return h;
+  }
+
+  // ──────────────────────────────────────────────────────────────────
+  // User row — ◇ glyph (cyan) + cyan vertical accent bar + text.
+  // Mirrors EventLog.tsx role="user" render.
+  // ──────────────────────────────────────────────────────────────────
+  function buildUserRow(text) {
+    const row = el("div", "trow trow-user");
+    row.innerHTML =
+      '<span class="trole role-user">◇</span>' +
+      '<span class="tbar-cyan">▎</span>' +
+      '<span class="trow-body"></span>';
+    row.querySelector(".trow-body").textContent = text;
+    return row;
+  }
+
+  // Same shape as a user row but the body content is built progressively
+  // by the animation. Returns the row + an `input` ref + a `caret` span.
+  function buildLiveUserRow() {
+    const row = el("div", "trow trow-user trow-live");
+    row.innerHTML =
+      '<span class="trole role-user">◇</span>' +
+      '<span class="tbar-cyan">▎</span>' +
+      '<span class="trow-body"><span class="tinput"></span><span class="tcaret">▍</span></span>';
+    row._input = row.querySelector(".tinput");
+    row._caret = row.querySelector(".tcaret");
+    return row;
+  }
+
+  // ──────────────────────────────────────────────────────────────────
+  // Tool pill row — ` ✓ tool_name `  duration  dim summary  /tool N
+  // Yellow bg pill (red bg for errors). Mirrors ToolPill in EventLog.tsx.
+  // ──────────────────────────────────────────────────────────────────
+  function buildToolRow(name, summary, durationLabel, indexHint) {
+    const row = el("div", "trow trow-tool");
+    const pill = el("span", "tpill tpill-ok");
+    pill.textContent = " ✓ " + name + " ";
+    row.appendChild(pill);
+    if (durationLabel) {
+      row.appendChild(el("span", "tdim", "  " + durationLabel));
+    }
+    row.appendChild(el("span", "tdim", "  " + summary));
+    if (indexHint) {
+      row.appendChild(el("span", "tdim tindex", "  /tool " + indexHint));
+    }
+    return row;
+  }
+
+  // ──────────────────────────────────────────────────────────────────
+  // Assistant row — ◆ glyph + ` v4-flash ` pill, then a green-bordered
+  // body the caller fills with text + (optionally) an EditBlockRow.
+  // Returns { row, body } so the caller can append into body.
+  // ──────────────────────────────────────────────────────────────────
+  function buildAssistantRow() {
+    const row = el("div", "trow trow-asst");
+    row.innerHTML =
+      '<div class="trow-asst-head">' +
+      '<span class="trole role-asst">◆</span>' +
+      '<span class="tpill tpill-model"> v4-flash </span>' +
+      "</div>" +
+      '<div class="trow-asst-body">' +
+      '<span class="tbar-green">▎</span>' +
+      '<div class="trow-asst-content"></div>' +
+      "</div>";
+    return { row, body: row.querySelector(".trow-asst-content") };
+  }
+
+  // ──────────────────────────────────────────────────────────────────
+  // EditBlockRow — rounded cyan border, filename in cyan bold, then
+  // `- old` red and `+ new` green lines. NO literal SEARCH/REPLACE
+  // markers (the model's text format is parsed; only the diff is
+  // shown). Mirrors EditBlockRow in markdown.tsx.
+  // ──────────────────────────────────────────────────────────────────
+  function buildEditBlock(filename, oldLines, newLines) {
+    const box = el("div", "tedit");
+    const head = el("div", "tedit-head");
+    head.appendChild(el("span", "tedit-filename", filename));
+    box.appendChild(head);
+    const diff = el("div", "tedit-diff");
+    box.appendChild(diff);
+    return { box, diff, oldLines, newLines };
+  }
+
+  // ──────────────────────────────────────────────────────────────────
+  // Info row — colored glyph + dim body. Used for pending + applied
+  // status lines, mirrors EventLog.tsx role="info".
+  // ──────────────────────────────────────────────────────────────────
+  function buildInfoRow(glyph, glyphColor, body) {
+    const row = el("div", "trow trow-info");
+    const g = el("span", "tinfo-glyph", glyph);
+    g.style.color = glyphColor;
+    row.appendChild(g);
+    row.appendChild(el("span", "tdim", " " + body));
+    return row;
+  }
+
+  // ──────────────────────────────────────────────────────────────────
+  // Animate text into a target node, character by character.
+  // ──────────────────────────────────────────────────────────────────
+  async function typeInto(target, text, perChar, cancelled) {
+    for (let i = 0; i < text.length; i++) {
+      target.appendChild(document.createTextNode(text[i]));
+      const j = perChar * (0.85 + Math.random() * 0.3);
+      const ch = text[i];
+      const pause = /[，。、；：,.;:]/.test(ch) ? perChar * 4 : 0;
+      // eslint-disable-next-line no-await-in-loop
+      await sleep(j + pause);
+      if (cancelled && cancelled()) return;
+    }
+  }
+
+  // Cancellation token — interrupts in-flight cycles when the user
+  // toggles language or clicks replay so we don't double-render.
+  let token = 0;
+
+  async function runCycle(root) {
+    const myToken = ++token;
+    const cancelled = () => myToken !== token;
+
+    root.classList.remove("trun-fade");
+    root.innerHTML = "";
+
+    root.appendChild(buildHeader(1));
+
+    await sleep(400);
+    if (cancelled()) return;
+
+    // 1. Live user prompt — types the question, then converts to a
+    //    permanent user row on submit.
+    const userMsg = tr(
+      "term.user",
+      "users.ts findByEmail is case-sensitive — login fails"
+    );
+    const live = buildLiveUserRow();
+    root.appendChild(live);
+    await sleep(400);
+    if (cancelled()) return;
+    await typeInto(live._input, userMsg, 32, cancelled);
+    if (cancelled()) return;
+    await sleep(550);
+    live._caret.remove();
+    live.classList.add("trow-sent");
+
+    // 2. Tool pills appear one by one. Real summaries come from
+    //    summarizeToolResult() in summarize.ts — we hard-code the
+    //    representative output for this scene.
+    await sleep(380);
+    if (cancelled()) return;
+    root.appendChild(
+      buildToolRow(
+        "search_files",
+        "matched 2 files: src/users.ts, src/users.test.ts",
+        "0.4s",
+        "1"
+      )
+    );
+    await sleep(560);
+    if (cancelled()) return;
+    root.appendChild(
+      buildToolRow("read_file", "read src/users.ts (412 chars)", "0.2s", "2")
+    );
+    await sleep(640);
+    if (cancelled()) return;
+
+    // 3. Assistant row — ◆ + model pill, then green-bordered body
+    //    containing the streamed text and the EditBlockRow.
+    const a = buildAssistantRow();
+    root.appendChild(a.row);
+    await sleep(280);
+    if (cancelled()) return;
+
+    const replyP = el("p", "tmd-p");
+    a.body.appendChild(replyP);
+    const replyMsg = tr(
+      "term.found",
+      "Found it. findByEmail uses === directly. Switching to lowercase normalization."
+    );
+    await typeInto(replyP, replyMsg, 18, cancelled);
+    if (cancelled()) return;
+    await sleep(360);
+
+    // 4. EditBlockRow — rounded cyan border with filename + colored
+    //    diff lines. No SEARCH/REPLACE markers.
+    const eb = buildEditBlock(
+      "src/users.ts",
+      ["  return users.find(u => u.email === email);"],
+      [
+        "  const needle = email.toLowerCase();",
+        "  return users.find(u => u.email.toLowerCase() === needle);",
+      ]
+    );
+    a.body.appendChild(eb.box);
+    await sleep(220);
+    if (cancelled()) return;
+
+    for (const line of eb.oldLines) {
+      const r = el("div", "tdiff tdiff-old", "- " + line);
+      eb.diff.appendChild(r);
+      // eslint-disable-next-line no-await-in-loop
+      await sleep(180);
+      if (cancelled()) return;
+    }
+    for (const line of eb.newLines) {
+      const r = el("div", "tdiff tdiff-new", "+ " + line);
+      eb.diff.appendChild(r);
+      // eslint-disable-next-line no-await-in-loop
+      await sleep(180);
+      if (cancelled()) return;
+    }
+    await sleep(420);
+    if (cancelled()) return;
+
+    // 5. Pending info row — slate `▸` + dim body. Real text from
+    //    formatPendingPreview() in edit-history.ts.
+    root.appendChild(
+      buildInfoRow(
+        "▸",
+        "#94a3b8",
+        tr(
+          "term.pending",
+          "1 pending edit block(s) — /apply (or y) to commit · /discard (or n) to drop"
+        )
+      )
+    );
+    await sleep(1700);
+    if (cancelled()) return;
+
+    // 6. /apply — second user turn. Live row, types `/apply`, then
+    //    transforms to a sent row. No tool pills (slash is local).
+    const apply = buildLiveUserRow();
+    root.appendChild(apply);
+    await sleep(420);
+    if (cancelled()) return;
+    await typeInto(apply._input, "/apply", 75, cancelled);
+    if (cancelled()) return;
+    await sleep(380);
+    apply._caret.remove();
+    apply.classList.add("trow-sent");
+
+    // 7. Applied info rows — first the header, then the per-file line.
+    //    Mirrors formatEditResults() in edit-history.ts.
+    await sleep(420);
+    root.appendChild(
+      buildInfoRow(
+        "▸",
+        "#94a3b8",
+        "edit blocks: 1/1 applied — /undo to roll back, or `git diff` to review"
+      )
+    );
+    const ok = el("div", "trow trow-info trow-info-detail");
+    const gl = el("span", "tinfo-glyph", "✓");
+    gl.style.color = "#4ade80";
+    ok.appendChild(el("span", "tdim", "  "));
+    ok.appendChild(gl);
+    ok.appendChild(el("span", "tdim", " applied      src/users.ts"));
+    root.appendChild(ok);
+
+    await sleep(2800);
+    if (cancelled()) return;
+
+    // 8. Fade and loop.
+    root.classList.add("trun-fade");
+    await sleep(900);
+    if (cancelled()) return;
+    runCycle(root);
+  }
+
+  // Reduced-motion fallback — paint the final scene without typing.
+  function runStatic(root) {
+    root.innerHTML = "";
+    root.appendChild(buildHeader(1));
+    root.appendChild(buildUserRow(tr("term.user", "")));
+    root.appendChild(
+      buildToolRow(
+        "search_files",
+        "matched 2 files: src/users.ts, src/users.test.ts",
+        "0.4s",
+        "1"
+      )
+    );
+    root.appendChild(
+      buildToolRow("read_file", "read src/users.ts (412 chars)", "0.2s", "2")
+    );
+    const a = buildAssistantRow();
+    root.appendChild(a.row);
+    const p = el("p", "tmd-p");
+    p.textContent = tr("term.found", "");
+    a.body.appendChild(p);
+    const eb = buildEditBlock(
+      "src/users.ts",
+      ["  return users.find(u => u.email === email);"],
+      [
+        "  const needle = email.toLowerCase();",
+        "  return users.find(u => u.email.toLowerCase() === needle);",
+      ]
+    );
+    a.body.appendChild(eb.box);
+    eb.oldLines.forEach((l) =>
+      eb.diff.appendChild(el("div", "tdiff tdiff-old", "- " + l))
+    );
+    eb.newLines.forEach((l) =>
+      eb.diff.appendChild(el("div", "tdiff tdiff-new", "+ " + l))
+    );
+    root.appendChild(buildInfoRow("▸", "#94a3b8", tr("term.pending", "")));
+  }
+
+  function init() {
+    const root = document.querySelector(ROOT_SEL);
+    if (!root) return;
+
+    if (window.Reasonix && typeof window.Reasonix.onLangChange === "function") {
+      window.Reasonix.onLangChange(() => runCycle(root));
+    }
+    // npm version arrives async after first paint — patch the header's
+    // version pill in place so we don't have to re-run the whole
+    // animation just to update one number.
+    if (window.Reasonix && typeof window.Reasonix.onVersionChange === "function") {
+      window.Reasonix.onVersionChange((v) => {
+        const pill = root.querySelector(".tw-ver");
+        if (pill) pill.textContent = "v" + v;
+      });
+    }
+
+    document.querySelectorAll(REPLAY_SEL).forEach((btn) => {
+      btn.addEventListener("click", () => runCycle(root));
+    });
+
+    const prm = window.matchMedia
+      ? window.matchMedia("(prefers-reduced-motion: reduce)")
+      : null;
+    if (prm && prm.matches) {
+      runStatic(root);
+      return;
+    }
+
+    runCycle(root);
+  }
+
+  window.Reasonix = window.Reasonix || {};
+  window.Reasonix.term = {
+    replay() {
+      const root = document.querySelector(ROOT_SEL);
+      if (root) runCycle(root);
+    },
+  };
+
+  if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", init);
+  } else {
+    init();
+  }
+})();

package.json

@@ -1,7 +1,7 @@
 {
   "name": "reasonix",
-  "version": "0.5.23",
-  "description": "DeepSeek-native agent framework: cache-first loop, R1 thought harvesting, tool-call repair.",
+  "version": "0.16.0",
+  "description": "DeepSeek-native coding agent: cache-first loop, flash-first cost control, tool-call repair.",
   "type": "module",
   "bin": {
     "reasonix": "dist/cli/index.js"
@@ -18,11 +18,16 @@
   "files": [
     "dist",
     "data/deepseek-tokenizer.json.gz",
+    "dashboard/index.html",
+    "dashboard/app.js",
+    "dashboard/app.css",
+    "dashboard/codemirror.js",
     "README.md",
     "LICENSE"
   ],
   "scripts": {
     "build": "tsup",
+    "build:cm": "node scripts/bundle-codemirror.mjs",
     "dev": "tsx src/cli/index.ts",
     "chat": "tsx src/cli/index.ts chat",
     "test": "vitest run",
@@ -31,8 +36,14 @@
     "lint:fix": "biome check --write src tests",
     "format": "biome format --write src tests",
     "typecheck": "tsc --noEmit",
+    "verify": "npm run lint && npm run typecheck && npm run test --silent",
+    "prepare": "simple-git-hooks || true",
     "prepublishOnly": "npm run lint && npm run typecheck && npm run test && npm run build"
   },
+  "simple-git-hooks": {
+    "pre-commit": "npm run lint",
+    "pre-push": "npm run verify"
+  },
   "keywords": [
     "agent",
     "llm",
@@ -62,12 +73,35 @@
     "ink": "^5.1.0",
     "ink-spinner": "^5.0.0",
     "ink-text-input": "^6.0.0",
-    "react": "^18.3.1"
+    "react": "^18.3.1",
+    "string-width": "^7.2.0"
   },
   "devDependencies": {
     "@biomejs/biome": "^1.9.4",
+    "@codemirror/autocomplete": "^6.16.0",
+    "@codemirror/commands": "^6.5.0",
+    "@codemirror/lang-cpp": "^6.0.2",
+    "@codemirror/lang-css": "^6.2.1",
+    "@codemirror/lang-go": "^6.0.1",
+    "@codemirror/lang-html": "^6.4.9",
+    "@codemirror/lang-javascript": "^6.2.2",
+    "@codemirror/lang-json": "^6.0.1",
+    "@codemirror/lang-markdown": "^6.2.5",
+    "@codemirror/lang-php": "^6.0.1",
+    "@codemirror/lang-python": "^6.1.6",
+    "@codemirror/lang-rust": "^6.0.1",
+    "@codemirror/lang-sql": "^6.6.4",
+    "@codemirror/lang-xml": "^6.1.0",
+    "@codemirror/lang-yaml": "^6.1.1",
+    "@codemirror/language": "^6.10.1",
+    "@codemirror/search": "^6.5.6",
+    "@codemirror/state": "^6.4.1",
+    "@codemirror/theme-one-dark": "^6.1.2",
+    "@codemirror/view": "^6.26.0",
     "@types/node": "^22.9.0",
     "@types/react": "^18.3.12",
+    "esbuild": "^0.21.5",
+    "simple-git-hooks": "^2.13.1",
     "tsup": "^8.3.5",
     "tsx": "^4.19.2",
     "typescript": "^5.6.3",

scripts/bundle-codemirror.mjs

@@ -0,0 +1,105 @@
+#!/usr/bin/env node
+/**
+ * Bundle every CodeMirror package the dashboard editor needs into one
+ * local ESM file at dashboard/codemirror.js. Replaces the runtime
+ * esm.sh imports — CDN multi-instance issues (different copies of
+ * @lezer/highlight breaking tag identity, etc.) just go away once
+ * everything ships in a single bundle.
+ *
+ * Run after bumping any @codemirror/* package version:
+ *   node scripts/bundle-codemirror.mjs
+ *
+ * The output is committed to the repo and shipped in the npm tarball.
+ */
+import { build } from "esbuild";
+import { mkdirSync, writeFileSync } from "node:fs";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const here = dirname(fileURLToPath(import.meta.url));
+const repoRoot = resolve(here, "..");
+const entryPath = resolve(repoRoot, "scripts/.cm-entry.mjs");
+const outPath = resolve(repoRoot, "dashboard/codemirror.js");
+
+// Re-export every symbol the editor needs as a single flat record.
+// Same shape app.js's old loadCodeMirror() returned, so swapping the
+// runtime fetch for `import * as cm from "./codemirror.js"` is a
+// one-line change on the consumer side.
+const entry = `
+import { EditorState, Compartment } from "@codemirror/state";
+import {
+  EditorView, keymap, lineNumbers, highlightActiveLine,
+  highlightActiveLineGutter, drawSelection,
+} from "@codemirror/view";
+import {
+  defaultKeymap, history, historyKeymap, indentWithTab,
+} from "@codemirror/commands";
+import {
+  syntaxHighlighting, defaultHighlightStyle, bracketMatching,
+  indentOnInput, foldGutter, foldKeymap,
+} from "@codemirror/language";
+import {
+  closeBrackets, closeBracketsKeymap, autocompletion, completionKeymap,
+} from "@codemirror/autocomplete";
+import { searchKeymap, highlightSelectionMatches } from "@codemirror/search";
+import { oneDark } from "@codemirror/theme-one-dark";
+
+import { javascript } from "@codemirror/lang-javascript";
+import { python } from "@codemirror/lang-python";
+import { markdown } from "@codemirror/lang-markdown";
+import { json } from "@codemirror/lang-json";
+import { html as htmlLang } from "@codemirror/lang-html";
+import { css } from "@codemirror/lang-css";
+import { rust } from "@codemirror/lang-rust";
+import { go } from "@codemirror/lang-go";
+import { cpp } from "@codemirror/lang-cpp";
+import { yaml } from "@codemirror/lang-yaml";
+import { sql } from "@codemirror/lang-sql";
+import { xml } from "@codemirror/lang-xml";
+import { php } from "@codemirror/lang-php";
+
+export {
+  EditorState, Compartment,
+  EditorView, keymap, lineNumbers, highlightActiveLine,
+  highlightActiveLineGutter, drawSelection,
+  defaultKeymap, history, historyKeymap, indentWithTab,
+  syntaxHighlighting, defaultHighlightStyle, bracketMatching,
+  indentOnInput, foldGutter, foldKeymap,
+  closeBrackets, closeBracketsKeymap, autocompletion, completionKeymap,
+  searchKeymap, highlightSelectionMatches,
+  oneDark,
+};
+
+export const langs = {
+  javascript,
+  typescript: () => javascript({ typescript: true }),
+  python,
+  markdown,
+  json,
+  html: htmlLang,
+  css,
+  rust,
+  go,
+  cpp,
+  yaml,
+  sql,
+  xml,
+  php,
+};
+`;
+
+mkdirSync(dirname(entryPath), { recursive: true });
+writeFileSync(entryPath, entry);
+
+await build({
+  entryPoints: [entryPath],
+  outfile: outPath,
+  bundle: true,
+  format: "esm",
+  target: "es2022",
+  minify: true,
+  legalComments: "none",
+  logLevel: "info",
+});
+
+console.log(`bundled → ${outPath}`);

scripts/ctrlc-probe.mjs

@@ -0,0 +1,28 @@
+// Minimal Ctrl+C probe. Usage: node scripts/ctrlc-probe.mjs
+// Reproduces the exact stdin setup Reasonix uses, then logs every byte
+// it sees and exits on \x03. Tells us whether the OS even delivers
+// Ctrl+C to a Node child on this terminal.
+
+process.stdin.setRawMode(true);
+process.stdin.setEncoding("utf8");
+process.stdin.resume();
+
+console.log("ctrl+c probe armed. press keys; ctrl+c should exit.");
+console.log("if ctrl+c does NOT exit, the byte never reaches Node on this terminal.\n");
+
+process.stdin.on("data", (chunk) => {
+  const s = String(chunk);
+  for (const ch of s) {
+    const code = ch.charCodeAt(0);
+    process.stdout.write(`got byte: 0x${code.toString(16).padStart(2, "0")} (${JSON.stringify(ch)})\r\n`);
+    if (ch === "\x03") {
+      process.stdout.write("→ \\x03 detected, exiting.\r\n");
+      process.exit(0);
+    }
+  }
+});
+
+process.on("SIGINT", () => {
+  process.stdout.write("→ SIGINT received, exiting.\r\n");
+  process.exit(0);
+});

scripts/shift-enter-probe.mjs

@@ -0,0 +1,30 @@
+// Shift+Enter probe. Usage: node scripts/shift-enter-probe.mjs
+// Enables modifyOtherKeys + kitty keyboard protocol, then prints the
+// raw bytes for every keypress. Press Shift+Enter and see what your
+// terminal actually emits — if it's just "0x0d", the host doesn't
+// support either protocol and there's nothing Reasonix can do at the
+// raw-stdin layer.
+
+process.stdout.write("\u001b[>4;2m"); // modifyOtherKeys level 2 (xterm)
+process.stdout.write("\u001b[>1u"); // kitty keyboard protocol level 1
+
+process.stdin.setRawMode(true);
+process.stdin.setEncoding("utf8");
+process.stdin.resume();
+
+console.log("shift+enter probe armed. press keys; ctrl+c exits.");
+console.log("expected for shift+enter:");
+console.log("  modifyOtherKeys → 0x1b 0x5b 0x32 0x37 0x3b 0x32 0x3b 0x31 0x33 0x7e  (\\x1b[27;2;13~)");
+console.log("  kitty           → 0x1b 0x5b 0x31 0x33 0x3b 0x32 0x75              (\\x1b[13;2u)");
+console.log("  unsupported     → 0x0d                                              (just \\r — no way to distinguish)\n");
+
+process.stdin.on("data", (chunk) => {
+  const s = String(chunk);
+  const bytes = [...s].map((c) => `0x${c.charCodeAt(0).toString(16).padStart(2, "0")}`).join(" ");
+  process.stdout.write(`got: ${bytes}    (${JSON.stringify(s)})\r\n`);
+  if (s.includes("\x03")) {
+    process.stdout.write("\u001b[>4m"); // disable modifyOtherKeys
+    process.stdout.write("\u001b[<u"); // pop kitty level
+    process.exit(0);
+  }
+});

src/adapters/event-sink-jsonl.ts

@@ -0,0 +1,46 @@
+import { type WriteStream, chmodSync, createWriteStream, mkdirSync } from "node:fs";
+import { dirname, join } from "node:path";
+import type { Event } from "../core/events.js";
+import { sanitizeName, sessionsDir } from "../memory/session.js";
+import type { EventSink } from "../ports/event-sink.js";
+
+export function eventLogPath(sessionName: string): string {
+  return join(sessionsDir(), `${sanitizeName(sessionName)}.events.jsonl`);
+}
+
+export class JsonlEventSink implements EventSink {
+  private buffered = 0;
+
+  constructor(private readonly stream: WriteStream) {}
+
+  append(ev: Event): void {
+    this.stream.write(`${JSON.stringify(ev)}\n`);
+    this.buffered++;
+  }
+
+  flush(): Promise<void> {
+    return new Promise((resolve) => {
+      if (this.buffered === 0) return resolve();
+      this.stream.uncork();
+      this.buffered = 0;
+      resolve();
+    });
+  }
+
+  close(): Promise<void> {
+    return new Promise((resolve) => {
+      this.stream.end(() => resolve());
+    });
+  }
+}
+
+export function openEventSink(path: string): JsonlEventSink {
+  mkdirSync(dirname(path), { recursive: true });
+  const stream = createWriteStream(path, { flags: "a" });
+  try {
+    chmodSync(path, 0o600);
+  } catch {
+    /* chmod no-op on Windows */
+  }
+  return new JsonlEventSink(stream);
+}

src/adapters/event-source-jsonl.ts

@@ -0,0 +1,30 @@
+import { existsSync, readFileSync } from "node:fs";
+import type { Event } from "../core/events.js";
+import type { EventSource } from "../ports/event-sink.js";
+import { eventLogPath } from "./event-sink-jsonl.js";
+
+export function readEventLogFile(path: string): Event[] {
+  if (!existsSync(path)) return [];
+  const raw = readFileSync(path, "utf8");
+  const out: Event[] = [];
+  for (const line of raw.split(/\r?\n/)) {
+    const trimmed = line.trim();
+    if (!trimmed) continue;
+    try {
+      const ev = JSON.parse(trimmed) as Event;
+      if (ev && typeof ev === "object" && typeof (ev as { type?: unknown }).type === "string") {
+        out.push(ev);
+      }
+    } catch {
+      /* malformed mid-line write — best-effort skip */
+    }
+  }
+  return out;
+}
+
+export class JsonlEventSource implements EventSource {
+  async *read(sessionName: string): AsyncIterable<Event> {
+    const events = readEventLogFile(eventLogPath(sessionName));
+    for (const ev of events) yield ev;
+  }
+}

src/at-mentions.ts

@@ -1,35 +1,12 @@
-/**
- * Expand `@path/to/file` mentions in a user prompt to inline file
- * content.
- *
- * Why: most interactive coding sessions start with "look at X, then
- * change Y". Typing `@src/loop.ts` reads faster and cheaper than
- * "look at src/loop.ts (and the model fires read_file, and we pay for
- * the round trip)" — the model sees the file content from turn 1
- * instead of round-tripping a tool call for it.
- *
- * Shape: the user's text is kept verbatim. Expanded file contents are
- * appended in a "Referenced files" block at the end, each wrapped in
- * `<file path="...">...</file>` so the model can cite them back
- * unambiguously.
- *
- * Safety: paths must resolve inside `rootDir` (no `..` escape, no
- * absolute paths), must exist as a regular file, and must be under
- * `maxBytes`. Missing / too-large / escaping paths get a short note
- * appended instead of content so the user sees why it was skipped.
- */
+/** Expand `@path` mentions inline. Paths must resolve inside rootDir; escapes / oversize get a skip note, not content. */
 
 import { type Dirent, existsSync, readFileSync, readdirSync, statSync } from "node:fs";
+import { readdir, stat } from "node:fs/promises";
 import { isAbsolute, join, relative, resolve } from "node:path";
 
 /** Caps match tool-result dispatch truncation (0.5.2). */
 export const DEFAULT_AT_MENTION_MAX_BYTES = 64 * 1024;
 
-/**
- * Default directory names skipped when listing files for the picker.
- * Matches what most repos gitignore AND keeps the picker off the
- * hottest bloat — `node_modules` alone can be 100k+ entries.
- */
 export const DEFAULT_PICKER_IGNORE_DIRS: readonly string[] = [
   "node_modules",
   ".git",
@@ -54,23 +31,7 @@ export interface ListFilesOptions {
   ignoreDirs?: readonly string[];
 }
 
-/**
- * Walk `root` recursively and return relative file paths (forward-slash
- * separator, regardless of platform) for the `@` picker.
- *
- * Synchronous on purpose: this runs once at App mount (and on each turn
- * so newly-created files show up) and blocks the render thread for a
- * predictable ~10-50ms on a moderate repo. An async variant would need
- * to coordinate with the Ink render loop; sync fits the rest of the
- * TUI's single-turn-per-tick model cleanly.
- *
- * Skips:
- *   - directories in `ignoreDirs` (default: DEFAULT_PICKER_IGNORE_DIRS)
- *   - any directory whose name starts with `.` (covers `.git`,
- *     `.vscode`, dotfile vendors). Dotfile REGULAR FILES (`.env`,
- *     `.gitignore`, `.prettierrc`) are kept — users reference them.
- *   - entries the walker can't read (permission errors, broken links).
- */
+/** Sync on purpose — fits the TUI's single-turn-per-tick model. Skips dot-DIRS but keeps dotfiles. */
 export function listFilesSync(root: string, opts: ListFilesOptions = {}): string[] {
   return listFilesWithStatsSync(root, opts).map((e) => e.path);
 }
@@ -82,15 +43,7 @@ export interface FileWithStats {
   mtimeMs: number;
 }
 
-/**
- * Same walk as {@link listFilesSync} but also statS each file for
- * modification time. Used by the `@` picker to surface recently-
- * edited files first — matches VS Code Quick Open / similar UX.
- *
- * Stat failures don't throw: the entry is kept with `mtimeMs: 0` so
- * it still appears in the picker (just sinks to the bottom of the
- * recency sort).
- */
+/** Stat failures kept as `mtimeMs: 0` — entry still appears, sinks to bottom of recency sort. */
 export function listFilesWithStatsSync(root: string, opts: ListFilesOptions = {}): FileWithStats[] {
   const maxResults = Math.max(1, opts.maxResults ?? 500);
   const ignore = new Set(opts.ignoreDirs ?? DEFAULT_PICKER_IGNORE_DIRS);
@@ -128,24 +81,84 @@ export function listFilesWithStatsSync(root: string, opts: ListFilesOptions = {}
   return out;
 }
 
-/**
- * Prefix pattern used by the `@` picker to detect an IN-PROGRESS
- * mention at the END of the input buffer. Captures the partial path
- * (which may be empty — just `@`) so the picker can use it as a
- * substring filter.
- *
- * Distinct from {@link AT_MENTION_PATTERN} (which finds completed
- * mentions anywhere in the text for expansion-at-submit). This one
- * fires on the trailing token only, anchored at end-of-input.
- */
+/** Parallel stat per directory — Windows stat syscalls are 3-5× slower than Linux. */
+export async function listFilesWithStatsAsync(
+  root: string,
+  opts: ListFilesOptions = {},
+): Promise<FileWithStats[]> {
+  const maxResults = Math.max(1, opts.maxResults ?? 500);
+  const ignore = new Set(opts.ignoreDirs ?? DEFAULT_PICKER_IGNORE_DIRS);
+  const rootAbs = resolve(root);
+  const out: FileWithStats[] = [];
+
+  const walk = async (dirAbs: string, dirRel: string): Promise<void> => {
+    if (out.length >= maxResults) return;
+    let entries: Dirent[];
+    try {
+      entries = await readdir(dirAbs, { withFileTypes: true });
+    } catch {
+      return;
+    }
+    entries.sort((a, b) => a.name.localeCompare(b.name));
+    // Pull file stats for THIS directory in parallel before
+    // recursing — readdir gave us all the names at once, may as
+    // well issue all the stats at once too. Recursion stays
+    // sequential so the alphabetical ordering of the merged list
+    // matches the sync walk's contract.
+    const fileEnts: Dirent[] = [];
+    for (const ent of entries) {
+      if (out.length >= maxResults) break;
+      if (ent.isDirectory()) {
+        if (ent.name.startsWith(".") || ignore.has(ent.name)) continue;
+        // Drain pending file stats from THIS directory before
+        // descending so the output order stays DFS-alphabetical.
+        if (fileEnts.length > 0) {
+          await statBatch(fileEnts, dirAbs, dirRel, out, maxResults);
+          fileEnts.length = 0;
+          if (out.length >= maxResults) return;
+        }
+        await walk(join(dirAbs, ent.name), dirRel ? `${dirRel}/${ent.name}` : ent.name);
+      } else if (ent.isFile()) {
+        fileEnts.push(ent);
+      }
+    }
+    if (fileEnts.length > 0 && out.length < maxResults) {
+      await statBatch(fileEnts, dirAbs, dirRel, out, maxResults);
+    }
+  };
+
+  await walk(rootAbs, "");
+  return out;
+}
+
+async function statBatch(
+  ents: readonly Dirent[],
+  dirAbs: string,
+  dirRel: string,
+  out: FileWithStats[],
+  maxResults: number,
+): Promise<void> {
+  const remaining = Math.max(0, maxResults - out.length);
+  const batch = ents.slice(0, remaining);
+  const stats = await Promise.all(
+    batch.map((e) =>
+      stat(join(dirAbs, e.name))
+        .then((s) => s.mtimeMs)
+        .catch(() => 0),
+    ),
+  );
+  for (let i = 0; i < batch.length; i++) {
+    const ent = batch[i]!;
+    out.push({
+      path: dirRel ? `${dirRel}/${ent.name}` : ent.name,
+      mtimeMs: stats[i] ?? 0,
+    });
+  }
+}
+
+/** Trailing-token only, anchored at end-of-input — distinct from `AT_MENTION_PATTERN` which scans all. */
 export const AT_PICKER_PREFIX = /(?:^|\s)@([a-zA-Z0-9_./\\-]*)$/;
 
-/**
- * Return the picker state for a given input buffer: the partial query
- * (may be empty string — just `@`) and the buffer offset of the `@`
- * character. `null` when the buffer doesn't end in a mention-in-
- * progress.
- */
 export function detectAtPicker(input: string): { query: string; atOffset: number } | null {
   const m = AT_PICKER_PREFIX.exec(input);
   if (!m) return null;
@@ -163,31 +176,9 @@ export type PickerCandidate = string | FileWithStats;
 export interface RankPickerOptions {
   /** Upper bound on returned entries. Default 40. */
   limit?: number;
-  /**
-   * Paths the user or model has touched recently (via tool calls like
-   * `read_file` / `edit_file`). Matching paths get a recency boost so
-   * the picker surfaces "stuff I just looked at" near the top.
-   */
   recentlyUsed?: readonly string[];
 }
 
-/**
- * Filter and rank candidate files against the picker's partial query.
- *
- * Empty query:
- *   - Sort by "recently used" bucket first (if provided), then mtime
- *     descending (newer first), then path alpha.
- *   - Pure-string input (no mtime data) falls back to alpha since
- *     recency info isn't available.
- *
- * Non-empty query:
- *   - Case-insensitive substring match, with a basename-prefix boost
- *     so `lo` floats `loop.ts`-shaped paths to the top.
- *   - Ties broken first by recently-used membership, then mtime.
- *
- * Back-compat: passes `string[]` through the same logic (mtime = 0,
- * recently-used still honored).
- */
 export function rankPickerCandidates(
   files: readonly PickerCandidate[],
   query: string,
@@ -249,17 +240,7 @@ export function rankPickerCandidates(
   return scored.slice(0, limit).map((s) => s.path);
 }
 
-/**
- * Matches `@` at a word boundary (start-of-string or preceded by
- * whitespace) followed by a path-like token. Deliberately rejects `@`
- * embedded in longer words (email addresses, mentions on social sites)
- * by requiring the word boundary.
- *
- * Path charset keeps it to the characters that appear in real repo
- * paths — letters, digits, `_` `-` `.` `/` `\`. Trailing `.` (e.g.
- * `@foo.ts.`) is stripped before lookup so a sentence-terminating
- * period doesn't break the mention.
- */
+/** Word-boundary anchor rejects `@` embedded in emails / social handles; trailing `.` stripped before lookup. */
 export const AT_MENTION_PATTERN = /(?<=^|\s)@([a-zA-Z0-9_./\\-]+)/g;
 
 export interface AtMentionExpansion {
@@ -278,10 +259,6 @@ export interface AtMentionExpansion {
 export interface AtMentionOptions {
   /** Max file size in bytes before a mention is skipped. */
   maxBytes?: number;
-  /**
-   * Optional file-system overrides for tests. Real callers omit these;
-   * the helper falls through to `node:fs`.
-   */
   fs?: {
     exists: (path: string) => boolean;
     isFile: (path: string) => boolean;
@@ -290,11 +267,6 @@ export interface AtMentionOptions {
   };
 }
 
-/**
- * Expand `@path` mentions in `text`. Returns the (possibly augmented)
- * text plus a per-mention report so the caller can surface expansions
- * in the UI.
- */
 export function expandAtMentions(
   text: string,
   rootDir: string,
@@ -395,3 +367,165 @@ const defaultFs: NonNullable<AtMentionOptions["fs"]> = {
   },
   read: (p) => readFileSync(p, "utf8"),
 };
+
+// @url mentions — async sibling of @path. Matches `@http(s)://...` after a
+// word boundary, fetches each URL once per session (in-memory cache), and
+// appends a "Referenced URLs" block under the prompt the model sees. Uses
+// the same web-fetch + HTML-strip pipeline as the model's `web_fetch` tool
+// so a `@url` reference and a model-issued fetch produce identical content.
+
+/** Trailing punctuation stripped separately — URLs legitimately contain `,` `.` `)` in query strings. */
+export const AT_URL_PATTERN = /(?<=^|\s)@(https?:\/\/\S+)/g;
+
+/** Default cap on inlined URL body (chars). Matches DEFAULT_AT_MENTION_MAX_BYTES order-of-magnitude. */
+export const DEFAULT_AT_URL_MAX_CHARS = 32_000;
+
+export interface AtUrlExpansion {
+  /** The raw `@url` token as it appeared in the text. */
+  token: string;
+  /** Absolute URL (after trailing-punctuation strip). */
+  url: string;
+  /** True if content was inlined. False = skipped (reason in `skip`). */
+  ok: boolean;
+  /** Page title when extractable from `<title>`. */
+  title?: string;
+  /** Char count of the (post-truncation) inlined body. */
+  chars?: number;
+  /** True iff the original page exceeded `maxChars` and was clipped. */
+  truncated?: boolean;
+  /** Why the mention was skipped — set when ok=false. */
+  skip?: "fetch-error" | "non-text" | "timeout" | "blocked";
+  /** Free-form error message attached to skip outcomes. */
+  error?: string;
+}
+
+export interface AtUrlOptions {
+  /** Max chars of inlined body per URL. Default DEFAULT_AT_URL_MAX_CHARS. */
+  maxChars?: number;
+  /** Per-URL fetch timeout in ms. */
+  timeoutMs?: number;
+  fetcher?: (
+    url: string,
+    opts: { maxChars?: number; timeoutMs?: number; signal?: AbortSignal },
+  ) => Promise<{ url: string; title?: string; text: string; truncated: boolean }>;
+  cache?: Map<string, AtUrlExpansion & { body?: string }>;
+  /** Forward Esc/abort to the fetcher. */
+  signal?: AbortSignal;
+}
+
+export async function expandAtUrls(
+  text: string,
+  opts: AtUrlOptions = {},
+): Promise<{ text: string; expansions: AtUrlExpansion[] }> {
+  const maxChars = opts.maxChars ?? DEFAULT_AT_URL_MAX_CHARS;
+  const fetcher = opts.fetcher;
+  if (!fetcher) {
+    throw new Error("expandAtUrls: fetcher option is required (wire src/tools/web.ts:webFetch)");
+  }
+
+  // De-dupe by URL so the same `@https://x.com` referenced twice fetches once.
+  const seen = new Map<string, AtUrlExpansion>();
+  const bodies = new Map<string, string>();
+  const order: string[] = [];
+
+  for (const match of text.matchAll(AT_URL_PATTERN)) {
+    const rawUrl = match[1] ?? "";
+    const url = stripUrlTail(rawUrl);
+    if (!url) continue;
+    if (seen.has(url)) continue;
+
+    const cached = opts.cache?.get(url);
+    if (cached) {
+      seen.set(url, cached);
+      if (cached.body) bodies.set(url, cached.body);
+      order.push(url);
+      continue;
+    }
+
+    let expansion: AtUrlExpansion;
+    let body = "";
+    try {
+      const page = await fetcher(url, {
+        maxChars,
+        timeoutMs: opts.timeoutMs,
+        signal: opts.signal,
+      });
+      body = page.text;
+      expansion = {
+        token: `@${url}`,
+        url,
+        ok: true,
+        title: page.title,
+        chars: body.length,
+        truncated: page.truncated,
+      };
+    } catch (err) {
+      const message = (err as Error).message ?? String(err);
+      // Tag a few common shapes so the UI can hint at causes.
+      let skip: AtUrlExpansion["skip"] = "fetch-error";
+      if (/aborted|timeout/i.test(message)) skip = "timeout";
+      else if (/40\d|forbidden|access denied|captcha/i.test(message)) skip = "blocked";
+      expansion = {
+        token: `@${url}`,
+        url,
+        ok: false,
+        skip,
+        error: message,
+      };
+    }
+    seen.set(url, expansion);
+    if (body) bodies.set(url, body);
+    if (opts.cache) opts.cache.set(url, { ...expansion, body });
+    order.push(url);
+  }
+
+  if (seen.size === 0) return { text, expansions: [] };
+
+  const expansions = order.map((u) => seen.get(u)!).filter(Boolean);
+  const blocks: string[] = [];
+  for (const ex of expansions) {
+    if (ex.ok) {
+      const titleAttr = ex.title ? ` title="${escapeAttr(ex.title)}"` : "";
+      const truncTag = ex.truncated ? ' truncated="true"' : "";
+      const body = bodies.get(ex.url) ?? "";
+      blocks.push(`<url href="${ex.url}"${titleAttr}${truncTag}>\n${body}\n</url>`);
+    } else {
+      const reasonAttr = ex.skip ?? "fetch-error";
+      blocks.push(`<url href="${ex.url}" skipped="${reasonAttr}" />`);
+    }
+  }
+  const augmented = `${text}\n\n[Referenced URLs]\n${blocks.join("\n\n")}`;
+  return { text: augmented, expansions };
+}
+
+/** Only strips `.,;:!?` and unmatched close-brackets — internal path / query punctuation preserved. */
+export function stripUrlTail(raw: string): string {
+  let s = raw;
+  while (s.length > 0) {
+    const last = s[s.length - 1]!;
+    if (".,;:!?".includes(last)) {
+      s = s.slice(0, -1);
+      continue;
+    }
+    if (")]}>".includes(last)) {
+      // Only strip if the matching open bracket isn't elsewhere in the
+      // URL — avoids butchering legitimate `(thing)` query fragments.
+      const open = ({ ")": "(", "]": "[", "}": "{", ">": "<" } as const)[
+        last as ")" | "]" | "}" | ">"
+      ];
+      if (!s.includes(open)) {
+        s = s.slice(0, -1);
+        continue;
+      }
+    }
+    break;
+  }
+  return s;
+}
+
+function escapeAttr(s: string): string {
+  return s
+    .replace(/"/g, "&quot;")
+    .replace(/[\r\n]+/g, " ")
+    .trim();
+}

src/cli/commands/chat.tsx

@@ -9,17 +9,20 @@ import { bridgeMcpTools } from "../../mcp/registry.js";
 import { parseMcpSpec } from "../../mcp/spec.js";
 import { SseTransport } from "../../mcp/sse.js";
 import { type McpTransport, StdioTransport } from "../../mcp/stdio.js";
+import { StreamableHttpTransport } from "../../mcp/streamable-http.js";
 import {
   loadSessionMessages,
   rewriteSession,
   sessionPath as sessionPathOf,
-} from "../../session.js";
+} from "../../memory/session.js";
 import { ToolRegistry } from "../../tools.js";
+import { registerChoiceTool } from "../../tools/choice.js";
 import { registerMemoryTools } from "../../tools/memory.js";
 import { registerWebTools } from "../../tools/web.js";
 import { App } from "../ui/App.js";
 import { SessionPicker } from "../ui/SessionPicker.js";
 import { Setup } from "../ui/Setup.js";
+import { KeystrokeProvider } from "../ui/keystroke-context.js";
 import type { McpServerSummary } from "../ui/slash.js";
 
 export interface ProgressInfo {
@@ -35,6 +38,13 @@ export interface ChatOptions {
   transcript?: string;
   harvest?: boolean;
   branch?: number;
+  /**
+   * Soft USD cap on session spend. Undefined → no cap (default).
+   * The loop warns once at 80% and refuses to start a new turn at
+   * 100%. Users can bump or clear via `/budget <usd>` / `/budget off`
+   * mid-session.
+   */
+  budgetUsd?: number;
   session?: string;
   /** Zero or more MCP server specs. Each: `"name=cmd args..."` or `"cmd args..."`. */
   mcp?: string[];
@@ -51,11 +61,27 @@ export interface ChatOptions {
    * Enable SEARCH/REPLACE edit-block processing after each assistant turn.
    * Set by `reasonix code`; plain `reasonix chat` leaves this off.
    */
-  codeMode?: { rootDir: string };
+  codeMode?: {
+    rootDir: string;
+    jobs?: import("../../tools/jobs.js").JobRegistry;
+    /**
+     * `/cwd <path>` callback — re-registers every rootDir-dependent
+     * native tool against the new path. Optional so embedders that
+     * don't want live cwd switching can omit it (the slash command
+     * then falls back to non-tool updates only).
+     */
+    reregisterTools?: (rootDir: string) => void;
+  };
   /** Skip the session picker — assume "Resume" (backwards-compatible auto-continue). */
   forceResume?: boolean;
   /** Skip the session picker — assume "New" (wipe the session file and start fresh). */
   forceNew?: boolean;
+  /**
+   * When true, suppress auto-launch of the embedded web dashboard.
+   * Default behavior (false/undefined) is to boot it on mount so the
+   * URL is visible in the status bar.
+   */
+  noDashboard?: boolean;
 }
 
 interface RootProps extends ChatOptions {
@@ -101,39 +127,51 @@ function Root({
   }
   process.env.DEEPSEEK_API_KEY = key;
 
+  // KeystrokeProvider must wrap App from OUTSIDE — App.tsx itself
+  // calls `useKeystroke` in its function body for global hotkeys
+  // (Ctrl+C, Esc abort, Shift+Tab edit-mode cycle, @-mention picker,
+  // slash-suggestion navigation). If the provider lives inside App's
+  // render, `useContext(KeystrokeContext)` returns `null` at hook
+  // call time and those handlers silently never subscribe.
   if (pending && appProps.session) {
     return (
-      <SessionPicker
-        sessionName={appProps.session}
-        messageCount={pending.messageCount}
-        lastActive={pending.lastActive}
-        onChoose={(choice) => {
-          if (choice === "new" || choice === "delete") {
-            // Wipe the session file. "new" and "delete" do the same thing
-            // at this step — the distinction is only in the picker's
-            // wording. A future enhancement could archive on "new".
-            rewriteSession(appProps.session!, []);
-          }
-          setPending(undefined);
-        }}
-      />
+      <KeystrokeProvider>
+        <SessionPicker
+          sessionName={appProps.session}
+          messageCount={pending.messageCount}
+          lastActive={pending.lastActive}
+          onChoose={(choice) => {
+            if (choice === "new" || choice === "delete") {
+              // Wipe the session file. "new" and "delete" do the same thing
+              // at this step — the distinction is only in the picker's
+              // wording. A future enhancement could archive on "new".
+              rewriteSession(appProps.session!, []);
+            }
+            setPending(undefined);
+          }}
+        />
+      </KeystrokeProvider>
     );
   }
 
   return (
-    <App
-      model={appProps.model}
-      system={appProps.system}
-      transcript={appProps.transcript}
-      harvest={appProps.harvest}
-      branch={appProps.branch}
-      session={appProps.session}
-      tools={tools}
-      mcpSpecs={mcpSpecs}
-      mcpServers={mcpServers}
-      progressSink={progressSink}
-      codeMode={appProps.codeMode}
-    />
+    <KeystrokeProvider>
+      <App
+        model={appProps.model}
+        system={appProps.system}
+        transcript={appProps.transcript}
+        harvest={appProps.harvest}
+        branch={appProps.branch}
+        budgetUsd={appProps.budgetUsd}
+        session={appProps.session}
+        tools={tools}
+        mcpSpecs={mcpSpecs}
+        mcpServers={mcpServers}
+        progressSink={progressSink}
+        codeMode={appProps.codeMode}
+        noDashboard={appProps.noDashboard}
+      />
+    </KeystrokeProvider>
   );
 }
 
@@ -170,7 +208,9 @@ export async function chatCommand(opts: ChatOptions): Promise<void> {
         const transport: McpTransport =
           spec.transport === "sse"
             ? new SseTransport({ url: spec.url })
-            : new StdioTransport({ command: spec.command, args: spec.args });
+            : spec.transport === "streamable-http"
+              ? new StreamableHttpTransport({ url: spec.url })
+              : new StdioTransport({ command: spec.command, args: spec.args });
         const mcp = new McpClient({ transport });
         await mcp.initialize();
         const bridge = await bridgeMcpTools(mcp, {
@@ -200,7 +240,9 @@ export async function chatCommand(opts: ChatOptions): Promise<void> {
         }
         const label = spec.name ?? "anon";
         const source =
-          spec.transport === "sse" ? spec.url : `${spec.command} ${spec.args.join(" ")}`;
+          spec.transport === "sse" || spec.transport === "streamable-http"
+            ? spec.url
+            : `${spec.command} ${spec.args.join(" ")}`;
         process.stderr.write(
           `▸ MCP[${label}]: ${bridge.registeredNames.length} tool(s) from ${source}\n`,
         );
@@ -255,6 +297,10 @@ export async function chatCommand(opts: ChatOptions): Promise<void> {
   if (!opts.seedTools) {
     if (!tools) tools = new ToolRegistry();
     registerMemoryTools(tools, {});
+    // `ask_choice` — branching primitive, useful in chat too (stylistic
+    // preferences, doc language, library picks). Independent of plan
+    // mode, which chat doesn't have anyway.
+    registerChoiceTool(tools);
   }
 
   // Decide whether to show the session picker. It's gated on: session
@@ -274,6 +320,17 @@ export async function chatCommand(opts: ChatOptions): Promise<void> {
     rewriteSession(opts.session, []);
   }
 
+  // No startup clear, no resize listener. Earlier attempts wrote
+  // various combinations of \x1b[2J / \x1b[3J / cursor-home to
+  // present a 'clean canvas' on launch and to neutralize Ink's
+  // eraseLines miscount on resize, but on xterm.js-based terminals
+  // (VSCode integrated terminal in particular) those sequences
+  // interfere with scrollback in ways that make wheel-up scroll
+  // dead. Letting Ink mount directly leaves the user's previous
+  // shell prompt visible above (scrolling up just works) and
+  // accepts the resize-ghost / launch-noise tradeoffs as known
+  // limitations — `/clear` is the manual reset.
+
   const { waitUntilExit } = render(
     <Root
       initialKey={initialKey}

src/cli/commands/code.tsx

@@ -19,10 +19,13 @@
  */
 
 import { basename, resolve } from "node:path";
-import { loadProjectShellAllowed } from "../../config.js";
-import { sanitizeName } from "../../session.js";
+import { loadEditMode, loadProjectShellAllowed } from "../../config.js";
+import { bootstrapSemanticSearchInCodeMode } from "../../index/semantic/tool.js";
+import { sanitizeName } from "../../memory/session.js";
 import { ToolRegistry } from "../../tools.js";
+import { registerChoiceTool } from "../../tools/choice.js";
 import { registerFilesystemTools } from "../../tools/filesystem.js";
+import { JobRegistry } from "../../tools/jobs.js";
 import { registerMemoryTools } from "../../tools/memory.js";
 import { registerPlanTool } from "../../tools/plan.js";
 import { registerShellTools } from "../../tools/shell.js";
@@ -50,6 +53,14 @@ export interface CodeOptions {
    * reasoning surfaced explicitly can pass `--harvest`.
    */
   harvest?: boolean;
+  /**
+   * Soft USD spend cap. Off by default. Same semantics as `chat`:
+   * warns at 80%, refuses next turn at 100%. Mid-session adjustable
+   * via `/budget <usd>` slash command.
+   */
+  budgetUsd?: number;
+  /** Suppress the auto-launched embedded web dashboard. */
+  noDashboard?: boolean;
 }
 
 export async function codeCommand(opts: CodeOptions = {}): Promise<void> {
@@ -65,44 +76,92 @@ export async function codeCommand(opts: CodeOptions = {}): Promise<void> {
   // shape instead of the `string="false"` JSON-in-string array that
   // triggered R1's DSML hallucinations all through 0.4.x.
   const tools = new ToolRegistry();
-  registerFilesystemTools(tools, { rootDir });
-  registerShellTools(tools, {
-    rootDir,
-    // Per-project "always allow" list persisted from prior ShellConfirm
-    // choices; merged on top of the built-in allowlist in shell.ts.
-    // GETTER form — re-read every dispatch so a prefix the user adds
-    // via ShellConfirm mid-session takes effect on the next shell call
-    // instead of waiting for `/new` or a relaunch.
-    extraAllowed: () => loadProjectShellAllowed(rootDir),
-  });
+  // Background-process registry shared between the shell tools and the
+  // TUI's /jobs + /kill slashes + exit cleanup. One per `reasonix code`
+  // run — orphan prevention on SIGINT / process exit kills everything
+  // it owns, so dev servers don't outlive the Reasonix process.
+  const jobs = new JobRegistry();
+  // Bundled re-registration so `/cwd <path>` can swap every rootDir-
+  // dependent tool atomically. ToolRegistry.register is keyed by name
+  // and overwrites in-place, so re-calling these against the existing
+  // registry replaces the closures cleanly without disturbing tool
+  // specs (names/descriptions/params don't reference rootDir, so the
+  // prefix cache survives).
+  const registerRootedTools = (root: string): void => {
+    registerFilesystemTools(tools, { rootDir: root });
+    registerShellTools(tools, {
+      rootDir: root,
+      // Per-project "always allow" list persisted from prior ShellConfirm
+      // choices; merged on top of the built-in allowlist in shell.ts.
+      // GETTER form — re-read every dispatch so a prefix the user adds
+      // via ShellConfirm mid-session takes effect on the next shell call
+      // instead of waiting for `/new` or a relaunch.
+      extraAllowed: () => loadProjectShellAllowed(root),
+      // `yolo` edit-mode disables shell confirmations entirely. Re-read
+      // from config on each dispatch so /mode yolo (or Shift+Tab cycling
+      // through to it) flips the gate live without forcing a relaunch.
+      allowAll: () => loadEditMode() === "yolo",
+      jobs,
+    });
+    // `remember` / `forget` / `recall_memory` — cross-session user memory.
+    // Project scope hashes off rootDir so switching projects gets a fresh
+    // per-project memory store; the global scope is shared across runs.
+    registerMemoryTools(tools, { projectRoot: root });
+  };
+  registerRootedTools(rootDir);
   // `submit_plan` is always in the spec list so the prefix cache stays
   // stable across plan-mode toggles (Pillar 1). The tool itself is a
   // no-op outside plan mode and throws `PlanProposedError` when the
   // user has `/plan`-enabled the session.
   registerPlanTool(tools);
-  // `remember` / `forget` / `recall_memory` — cross-session user memory.
-  // Project scope hashes off rootDir so switching projects gets a fresh
-  // per-project memory store; the global scope is shared across runs.
-  registerMemoryTools(tools, { projectRoot: rootDir });
+  // `ask_choice` — branching primitive. Independent of plan mode: the
+  // model uses it to put a 2–4 way choice in front of the user
+  // (strategy, style, library pick) without trying to squeeze the
+  // menu into a submit_plan body. Keeping it always-registered
+  // preserves the prefix cache across plan-mode toggles.
+  registerChoiceTool(tools);
   // `run_skill` is intentionally NOT registered here — App.tsx wires it
   // up with the subagent runner attached, so `runAs: subagent` skills
   // can spawn isolated child loops. Doing it here would mean the App's
   // re-registration would shadow the no-runner version, which works
   // (last write wins) but obscures the wiring.
 
+  // Bootstrap semantic_search. Silent: registers the tool when an
+  // on-disk index already exists, skips entirely otherwise. Setup
+  // happens via the explicit `reasonix index` command — never
+  // by surprise on launch.
+  const semantic = await bootstrapSemanticSearchInCodeMode(tools, rootDir);
+
   process.stderr.write(
-    `▸ reasonix code: rooted at ${rootDir}, session "${session ?? "(ephemeral)"}" · ${tools.size} native tool(s)\n`,
+    `▸ reasonix code: rooted at ${rootDir}, session "${session ?? "(ephemeral)"}" · ${tools.size} native tool(s)${
+      semantic.enabled ? " · semantic_search on" : ""
+    }\n`,
   );
 
+  // Belt-and-suspenders cleanup: even though spawn(detached:false)
+  // should tie child processes to the parent's lifetime, Windows cmd.exe
+  // wrappers occasionally leak. We DON'T install SIGINT/SIGTERM
+  // handlers here — that overrode Node's default "exit on Ctrl+C" with
+  // a silent no-op, which made Ctrl+C feel broken in the TUI. App.tsx
+  // owns the SIGINT path now (it shows the quit-armed banner and calls
+  // exit() on confirmation); this 'exit' hook just guarantees the job
+  // registry is drained on the way out, regardless of which exit path
+  // fired.
+  process.once("exit", () => {
+    void jobs.shutdown();
+  });
+
   await chatCommand({
-    model: opts.model ?? "deepseek-v4-pro",
+    model: opts.model ?? "deepseek-v4-flash",
     harvest: opts.harvest ?? false,
-    system: codeSystemPrompt(rootDir),
+    budgetUsd: opts.budgetUsd,
+    system: codeSystemPrompt(rootDir, { hasSemanticSearch: semantic.enabled }),
     transcript: opts.transcript,
     session,
     seedTools: tools,
-    codeMode: { rootDir },
+    codeMode: { rootDir, jobs, reregisterTools: registerRootedTools },
     forceResume: opts.forceResume,
     forceNew: opts.forceNew,
+    noDashboard: opts.noDashboard,
   });
 }

src/cli/commands/commit.ts

@@ -0,0 +1,333 @@
+/** Drafts via diff + recent log (style mimicry); commit uses `-F -` so multi-line bodies survive shell quoting. */
+
+import { spawn, spawnSync } from "node:child_process";
+import { mkdtempSync, readFileSync, unlinkSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { stdin, stdout } from "node:process";
+import { createInterface } from "node:readline/promises";
+import { DeepSeekClient } from "../../client.js";
+import { loadApiKey } from "../../config.js";
+import { loadDotenv } from "../../env.js";
+
+export interface CommitOptions {
+  /** Override the default model (deepseek-v4-flash). */
+  model?: string;
+  /** Skip the confirmation step — useful in scripts where the diff has been pre-reviewed. */
+  yes?: boolean;
+}
+
+const DEFAULT_MODEL = "deepseek-v4-flash";
+const DIFF_BYTE_CAP = 80 * 1024;
+const LOG_COUNT = 10;
+
+const SYSTEM_PROMPT = `You draft git commit messages.
+
+Output ONLY the commit message — no preamble, no \`\`\` fences, no "Here's a commit message:" lead-in. The first line of your output IS the commit subject.
+
+Match the project's existing style:
+- Look at the recent commits provided. Mirror their voice, conventional-commit prefix usage (or absence), tense, length, body structure.
+- If recent commits use a "type(scope): summary" prefix, use it. If they don't, don't invent one.
+- Subject line: one line, ≤72 chars, imperative mood, no trailing period.
+- Body (optional): explain WHY when the diff isn't self-evident. Wrap at ~72 chars. Skip the body for trivial changes — repeating the subject in the body is noise.
+
+The diff is the source of truth for what changed; describe THAT, not your guesses about the broader project. If the diff includes a deletion you can't explain from the surrounding context, name it but don't speculate about why.
+
+No emojis unless the recent commits use them.
+No co-author trailers, no "Generated with X" footers.`;
+
+function runGit(
+  args: string[],
+  opts: { input?: string } = {},
+): { stdout: string; stderr: string; status: number | null } {
+  const result = spawnSync("git", args, {
+    encoding: "utf8",
+    stdio: ["pipe", "pipe", "pipe"],
+    input: opts.input,
+    maxBuffer: 32 * 1024 * 1024,
+  });
+  return {
+    stdout: result.stdout ?? "",
+    stderr: result.stderr ?? "",
+    status: result.status,
+  };
+}
+
+function dieIfNotGitRepo(): void {
+  const r = runGit(["rev-parse", "--is-inside-work-tree"]);
+  if (r.status !== 0) {
+    process.stderr.write("reasonix commit: not inside a git repository.\n");
+    process.exit(1);
+  }
+}
+
+interface DiffResult {
+  diff: string;
+  source: "staged" | "working-tree";
+  truncated: boolean;
+}
+
+function readDiff(): DiffResult | null {
+  const staged = runGit(["diff", "--staged", "--no-color"]);
+  if (staged.status !== 0) {
+    process.stderr.write(`reasonix commit: git diff --staged failed: ${staged.stderr.trim()}\n`);
+    process.exit(1);
+  }
+  if (staged.stdout.trim().length > 0) {
+    return capDiff(staged.stdout, "staged");
+  }
+  const wt = runGit(["diff", "--no-color"]);
+  if (wt.stdout.trim().length === 0) {
+    return null;
+  }
+  return capDiff(wt.stdout, "working-tree");
+}
+
+function capDiff(raw: string, source: "staged" | "working-tree"): DiffResult {
+  if (raw.length <= DIFF_BYTE_CAP) {
+    return { diff: raw, source, truncated: false };
+  }
+  const head = raw.slice(0, Math.floor(DIFF_BYTE_CAP * 0.7));
+  const tail = raw.slice(-Math.floor(DIFF_BYTE_CAP * 0.3));
+  return {
+    diff: `${head}\n\n[… ${raw.length - DIFF_BYTE_CAP} bytes of diff truncated …]\n\n${tail}`,
+    source,
+    truncated: true,
+  };
+}
+
+function readRecentCommits(): string {
+  const r = runGit(["log", `-${LOG_COUNT}`, "--no-merges", "--format=%s%n%b%n---END---"]);
+  if (r.status !== 0) {
+    // Repo may not have any commits yet (initial commit case). Don't
+    // fail — let the model work from the diff alone.
+    return "";
+  }
+  return r.stdout.trim();
+}
+
+async function draftMessage(
+  client: DeepSeekClient,
+  model: string,
+  diff: DiffResult,
+  recentCommits: string,
+): Promise<string> {
+  const userParts: string[] = [];
+  if (recentCommits) {
+    userParts.push(`Recent commits (style reference):\n\n${recentCommits}`);
+  }
+  if (diff.source === "working-tree") {
+    userParts.push(
+      "(NOTE: diff is from the working tree, not the staging area — nothing is staged yet. The user will stage selectively after seeing the draft.)",
+    );
+  }
+  userParts.push(`Diff to summarize:\n\n${diff.diff}`);
+
+  const resp = await client.chat({
+    model,
+    messages: [
+      { role: "system", content: SYSTEM_PROMPT },
+      { role: "user", content: userParts.join("\n\n") },
+    ],
+    temperature: 0.2,
+  });
+  return stripCodeFences(resp.content.trim());
+}
+
+function stripCodeFences(s: string): string {
+  // Some models still wrap output in ``` despite the system prompt
+  // telling them not to. Strip a single leading + trailing fence pair
+  // if present. Only operates on a wrapping pair — internal fences
+  // (a code block inside the body) stay.
+  const trimmed = s.trim();
+  const fenceOpen = /^```[a-zA-Z]*\n/;
+  const fenceClose = /\n?```$/;
+  if (fenceOpen.test(trimmed) && fenceClose.test(trimmed)) {
+    return trimmed.replace(fenceOpen, "").replace(fenceClose, "").trim();
+  }
+  return trimmed;
+}
+
+function printDraft(message: string): void {
+  const sep = "─".repeat(60);
+  process.stdout.write(`\n${sep}\n${message}\n${sep}\n\n`);
+}
+
+async function promptChoice(): Promise<"accept" | "regen" | "edit" | "cancel"> {
+  const rl = createInterface({ input: stdin, output: stdout });
+  try {
+    const answer = await rl.question("[a]ccept / [r]egenerate / [e]dit / [c]ancel: ");
+    const k = answer.trim().toLowerCase();
+    if (k === "" || k === "a" || k === "y" || k === "yes") return "accept";
+    if (k === "r" || k === "regen" || k === "regenerate") return "regen";
+    if (k === "e" || k === "edit") return "edit";
+    return "cancel";
+  } finally {
+    rl.close();
+  }
+}
+
+function editInExternal(initial: string): string | null {
+  const editor = process.env.GIT_EDITOR ?? process.env.VISUAL ?? process.env.EDITOR;
+  if (!editor) {
+    process.stderr.write(
+      "reasonix commit: no $EDITOR / $VISUAL / $GIT_EDITOR set — can't open editor. Pick [a]ccept and `git commit --amend` afterwards.\n",
+    );
+    return null;
+  }
+  const dir = mkdtempSync(join(tmpdir(), "reasonix-commit-"));
+  const path = join(dir, "COMMIT_EDITMSG");
+  writeFileSync(path, initial, "utf8");
+  // spawnSync with shell:true is required so $EDITOR strings like
+  // `code --wait` work — they're shell command lines, not argv tuples.
+  // The trust boundary is the user's own env var; matches how git
+  // itself launches editors.
+  const result = spawnSync(`${editor} "${path}"`, {
+    stdio: "inherit",
+    shell: true,
+  });
+  if (result.status !== 0) {
+    try {
+      unlinkSync(path);
+    } catch {
+      /* ignore */
+    }
+    process.stderr.write(
+      `reasonix commit: editor exited ${result.status} — keeping prior draft.\n`,
+    );
+    return null;
+  }
+  let edited: string;
+  try {
+    edited = readFileSync(path, "utf8");
+  } catch {
+    return null;
+  } finally {
+    try {
+      unlinkSync(path);
+    } catch {
+      /* ignore */
+    }
+  }
+  // Strip git's standard `# …` comment lines, even though we didn't
+  // emit any — a user habituated to `git commit` may add `#`-prefixed
+  // notes by reflex.
+  const cleaned = edited
+    .split(/\r?\n/)
+    .filter((line) => !/^\s*#/.test(line))
+    .join("\n")
+    .trim();
+  return cleaned || null;
+}
+
+function commitWithMessage(message: string): void {
+  // -F - reads the message from stdin, sidestepping shell quoting and
+  // letting multi-line bodies through cleanly. Inherit stdio so the
+  // user sees git's own confirmation / pre-commit hook output.
+  const child = spawn("git", ["commit", "-F", "-"], {
+    stdio: ["pipe", "inherit", "inherit"],
+  });
+  child.stdin.write(message);
+  child.stdin.end();
+  child.on("close", (code) => {
+    if (code !== 0) {
+      process.stderr.write(`reasonix commit: git commit exited ${code}.\n`);
+      process.exit(code ?? 1);
+    }
+  });
+}
+
+export async function commitCommand(opts: CommitOptions = {}): Promise<void> {
+  loadDotenv();
+  dieIfNotGitRepo();
+
+  const apiKey = loadApiKey() ?? process.env.DEEPSEEK_API_KEY;
+  if (!apiKey) {
+    process.stderr.write(
+      "reasonix commit: DEEPSEEK_API_KEY not set. Run `reasonix setup` to save one, or export it.\n",
+    );
+    process.exit(1);
+  }
+
+  const diff = readDiff();
+  if (!diff) {
+    process.stderr.write(
+      "reasonix commit: no staged changes and working tree is clean — nothing to commit.\n",
+    );
+    process.exit(1);
+  }
+  if (diff.source === "working-tree") {
+    process.stderr.write(
+      "reasonix commit: nothing staged — drafting from working-tree diff. Stage your changes and re-run, or use the draft as a starting point.\n",
+    );
+  }
+  if (diff.truncated) {
+    process.stderr.write(
+      "reasonix commit: diff exceeded 80KB; head + tail sent to the model. Large diffs often produce vague drafts — consider committing in smaller chunks.\n",
+    );
+  }
+
+  const client = new DeepSeekClient({ apiKey });
+  const model = opts.model ?? DEFAULT_MODEL;
+  const recentCommits = readRecentCommits();
+
+  let message = "";
+  let firstPass = true;
+  while (true) {
+    if (firstPass) {
+      process.stdout.write("Drafting commit message…\n");
+    } else {
+      process.stdout.write("Regenerating…\n");
+    }
+    firstPass = false;
+    try {
+      message = await draftMessage(client, model, diff, recentCommits);
+    } catch (err) {
+      process.stderr.write(`reasonix commit: model call failed — ${(err as Error).message}\n`);
+      process.exit(1);
+    }
+    if (!message) {
+      process.stderr.write("reasonix commit: model returned an empty draft. Try again.\n");
+      process.exit(1);
+    }
+    printDraft(message);
+
+    if (opts.yes) break;
+    if (diff.source === "working-tree") {
+      // Refuse to commit a working-tree-derived draft — the staging
+      // area is empty so `git commit` would fail anyway. Print the
+      // draft so the user can copy it; exit 0 because we did our job.
+      process.stdout.write(
+        "(no staged changes — draft printed above for you to copy. Stage with `git add` and re-run to commit.)\n",
+      );
+      return;
+    }
+
+    const choice = await promptChoice();
+    if (choice === "accept") break;
+    if (choice === "cancel") {
+      process.stderr.write("commit cancelled.\n");
+      return;
+    }
+    if (choice === "edit") {
+      const edited = editInExternal(message);
+      if (edited) {
+        message = edited;
+        printDraft(message);
+        // Re-prompt: the user may want to edit again, accept, etc.
+        const next = await promptChoice();
+        if (next === "accept") break;
+        if (next === "cancel") {
+          process.stderr.write("commit cancelled.\n");
+          return;
+        }
+        // next is "regen" or another "edit" — fall through to the
+        // loop top to re-draft (regen) or land back at this branch.
+      }
+      // editor returned no edit — loop top will regen by default.
+    }
+    // Anything else (regen, or unsuccessful edit) → loop top redraws.
+  }
+
+  commitWithMessage(message);
+}

src/cli/commands/diff.ts

@@ -2,8 +2,8 @@ import { writeFileSync } from "node:fs";
 import { basename } from "node:path";
 import { render } from "ink";
 import React from "react";
-import { diffTranscripts, renderMarkdown, renderSummaryTable } from "../../diff.js";
-import { readTranscript } from "../../transcript.js";
+import { diffTranscripts, renderMarkdown, renderSummaryTable } from "../../transcript/diff.js";
+import { readTranscript } from "../../transcript/log.js";
 import { DiffApp } from "../ui/DiffApp.js";
 
 export interface DiffOptions {
@@ -18,13 +18,6 @@ export interface DiffOptions {
   tui?: boolean;
 }
 
-/**
- * Compare two transcripts. Three output paths, picked in order:
- *   - If --md is passed: write the markdown report. Also prints the stdout
- *     summary so the user sees what was exported.
- *   - If --print, no TTY, or --md (see above): stdout summary table.
- *   - Otherwise: interactive Ink TUI with split-pane + n/N divergence jump.
- */
 export async function diffCommand(opts: DiffOptions): Promise<void> {
   const aParsed = readTranscript(opts.a);
   const bParsed = readTranscript(opts.b);

src/cli/commands/doctor.ts

@@ -0,0 +1,358 @@
+/** Plain-text (not Ink) — must work when everything else is broken. fail → exit 1; warn → exit 0. */
+
+import { existsSync, statSync } from "node:fs";
+import { homedir } from "node:os";
+import { dirname, join, resolve } from "node:path";
+import { DeepSeekClient } from "../../client.js";
+import { defaultConfigPath, readConfig } from "../../config.js";
+import { loadDotenv } from "../../env.js";
+import { loadHooks } from "../../hooks.js";
+import { indexExists } from "../../index/semantic/builder.js";
+import { checkOllamaStatus } from "../../index/semantic/ollama-launcher.js";
+import { listSessions } from "../../memory/session.js";
+import { VERSION } from "../../version.js";
+
+type Level = "ok" | "warn" | "fail";
+
+interface Check {
+  label: string;
+  level: Level;
+  detail: string;
+}
+
+const TTY = process.stdout.isTTY && process.env.TERM !== "dumb";
+
+function color(text: string, code: string): string {
+  if (!TTY) return text;
+  return `\x1b[${code}m${text}\x1b[0m`;
+}
+
+function badge(level: Level): string {
+  if (level === "ok") return color("✓", "32");
+  if (level === "warn") return color("⚠", "33");
+  return color("✗", "31");
+}
+
+function tail4(s: string): string {
+  return s.length <= 4 ? s : `…${s.slice(-4)}`;
+}
+
+function fmtBytes(n: number): string {
+  if (n < 1024) return `${n} B`;
+  if (n < 1024 * 1024) return `${(n / 1024).toFixed(1)} KB`;
+  return `${(n / 1024 / 1024).toFixed(1)} MB`;
+}
+
+async function checkApiKey(): Promise<Check> {
+  const fromEnv = process.env.DEEPSEEK_API_KEY;
+  if (fromEnv) {
+    return {
+      label: "api key      ",
+      level: "ok",
+      detail: `set via env DEEPSEEK_API_KEY (${tail4(fromEnv)})`,
+    };
+  }
+  try {
+    const cfg = readConfig();
+    if (cfg.apiKey) {
+      return {
+        label: "api key      ",
+        level: "ok",
+        detail: `from ${defaultConfigPath()} (${tail4(cfg.apiKey)})`,
+      };
+    }
+  } catch {
+    /* fall through */
+  }
+  return {
+    label: "api key      ",
+    level: "fail",
+    detail:
+      "not set — `reasonix setup` to save one, or export DEEPSEEK_API_KEY. Get a key at https://platform.deepseek.com/api_keys",
+  };
+}
+
+async function checkConfig(): Promise<Check> {
+  const path = defaultConfigPath();
+  if (!existsSync(path)) {
+    return {
+      label: "config       ",
+      level: "warn",
+      detail: "missing — running with library defaults. `reasonix setup` writes one.",
+    };
+  }
+  try {
+    const cfg = readConfig(path);
+    const parts: string[] = [];
+    if (cfg.preset) parts.push(`preset=${cfg.preset}`);
+    if (cfg.editMode) parts.push(`editMode=${cfg.editMode}`);
+    if (cfg.mcp && cfg.mcp.length > 0) parts.push(`mcp=${cfg.mcp.length}`);
+    return {
+      label: "config       ",
+      level: "ok",
+      detail: `${path}${parts.length ? ` (${parts.join(", ")})` : ""}`,
+    };
+  } catch (err) {
+    return {
+      label: "config       ",
+      level: "fail",
+      detail: `${path} unreadable — ${(err as Error).message}`,
+    };
+  }
+}
+
+async function checkApiReach(): Promise<Check> {
+  const key = process.env.DEEPSEEK_API_KEY ?? readConfig().apiKey;
+  if (!key) {
+    return {
+      label: "api reach    ",
+      level: "warn",
+      detail: "skipped — no api key to test with",
+    };
+  }
+  try {
+    const client = new DeepSeekClient({ apiKey: key });
+    const ctl = new AbortController();
+    const timer = setTimeout(() => ctl.abort(), 8_000);
+    let balance: Awaited<ReturnType<DeepSeekClient["getBalance"]>>;
+    try {
+      balance = await client.getBalance({ signal: ctl.signal });
+    } finally {
+      clearTimeout(timer);
+    }
+    if (!balance) {
+      return {
+        label: "api reach    ",
+        level: "fail",
+        detail: "/user/balance returned null — auth failed or network blocked",
+      };
+    }
+    if (!balance.is_available) {
+      const info = balance.balance_infos[0];
+      return {
+        label: "api reach    ",
+        level: "warn",
+        detail: `account flagged not-available${info ? ` (${info.total_balance} ${info.currency})` : ""} — top up or check your dashboard`,
+      };
+    }
+    const info = balance.balance_infos[0];
+    return {
+      label: "api reach    ",
+      level: "ok",
+      detail: info
+        ? `/user/balance ok — ${info.total_balance} ${info.currency}`
+        : "/user/balance ok",
+    };
+  } catch (err) {
+    return {
+      label: "api reach    ",
+      level: "fail",
+      detail: `${(err as Error).message}`,
+    };
+  }
+}
+
+async function checkTokenizer(): Promise<Check> {
+  // The tokenizer file is the gzipped vocab shipped under data/. We
+  // resolve relative to the package's dist/ rather than process.cwd()
+  // — the same logic the runtime uses when loading on first count.
+  const candidates = [
+    join(
+      dirname(new URL(import.meta.url).pathname.replace(/^\/([A-Za-z]:)/, "$1")),
+      "..",
+      "..",
+      "..",
+      "data",
+      "deepseek-tokenizer.json.gz",
+    ),
+    join(process.cwd(), "data", "deepseek-tokenizer.json.gz"),
+  ];
+  for (const p of candidates) {
+    if (existsSync(p)) {
+      try {
+        const stat = statSync(p);
+        return {
+          label: "tokenizer    ",
+          level: "ok",
+          detail: `${p} (${fmtBytes(stat.size)})`,
+        };
+      } catch {
+        /* try next */
+      }
+    }
+  }
+  return {
+    label: "tokenizer    ",
+    level: "warn",
+    detail:
+      "data/deepseek-tokenizer.json.gz not found — token counts will fall back to char heuristics",
+  };
+}
+
+async function checkSessions(): Promise<Check> {
+  try {
+    const list = listSessions();
+    if (list.length === 0) {
+      return {
+        label: "sessions     ",
+        level: "ok",
+        detail: "0 saved",
+      };
+    }
+    const totalBytes = list.reduce((s, e) => s + e.size, 0);
+    const oldest = list[list.length - 1]!;
+    const ageDays = Math.floor((Date.now() - oldest.mtime.getTime()) / (24 * 60 * 60 * 1000));
+    const stale = list.filter(
+      (e) => Date.now() - e.mtime.getTime() >= 90 * 24 * 60 * 60 * 1000,
+    ).length;
+    const detail = `${list.length} saved · ${fmtBytes(totalBytes)} · oldest ${ageDays}d`;
+    if (stale > 0) {
+      return {
+        label: "sessions     ",
+        level: "warn",
+        detail: `${detail} · ${stale} idle ≥90d (run /prune-sessions)`,
+      };
+    }
+    return { label: "sessions     ", level: "ok", detail };
+  } catch (err) {
+    return {
+      label: "sessions     ",
+      level: "warn",
+      detail: `cannot list — ${(err as Error).message}`,
+    };
+  }
+}
+
+async function checkHooks(projectRoot: string): Promise<Check> {
+  try {
+    const all = loadHooks({ projectRoot });
+    const global = all.filter((h) => h.scope === "global").length;
+    const project = all.filter((h) => h.scope === "project").length;
+    return {
+      label: "hooks        ",
+      level: "ok",
+      detail: `${global} global, ${project} project`,
+    };
+  } catch (err) {
+    return {
+      label: "hooks        ",
+      level: "warn",
+      detail: `couldn't parse settings.json — ${(err as Error).message}`,
+    };
+  }
+}
+
+async function checkOllama(projectRoot: string): Promise<Check> {
+  // Ollama is only meaningful when an index has been built — otherwise
+  // the daemon being down is just noise. Skip the check entirely on
+  // projects that don't use semantic search.
+  let exists = false;
+  try {
+    exists = await indexExists(projectRoot);
+  } catch {
+    /* treat as no index */
+  }
+  if (!exists) {
+    return {
+      label: "ollama       ",
+      level: "ok",
+      detail: "not in use (no semantic index built; `reasonix index` to enable)",
+    };
+  }
+  try {
+    const status = await checkOllamaStatus(process.env.REASONIX_EMBED_MODEL ?? "nomic-embed-text");
+    if (!status.binaryFound) {
+      return {
+        label: "ollama       ",
+        level: "warn",
+        detail: "binary not on PATH — semantic_search will fail; install from https://ollama.com",
+      };
+    }
+    if (!status.daemonRunning) {
+      return {
+        label: "ollama       ",
+        level: "warn",
+        detail: "daemon not running — `ollama serve` (or just call /semantic in TUI to auto-start)",
+      };
+    }
+    if (!status.modelPulled) {
+      return {
+        label: "ollama       ",
+        level: "warn",
+        detail: `model ${status.modelName} not pulled — \`ollama pull ${status.modelName}\``,
+      };
+    }
+    return {
+      label: "ollama       ",
+      level: "ok",
+      detail: `daemon up · model ${status.modelName} ready`,
+    };
+  } catch (err) {
+    return {
+      label: "ollama       ",
+      level: "warn",
+      detail: `probe failed — ${(err as Error).message}`,
+    };
+  }
+}
+
+async function checkProject(projectRoot: string): Promise<Check> {
+  // Heuristic: a "real" project has either .git, REASONIX.md, or
+  // package.json. Lacking all three, `reasonix code` still works but
+  // @-mentions and the project-memory pin won't surface much.
+  const markers = [".git", "REASONIX.md", "package.json", "pyproject.toml", "Cargo.toml", "go.mod"];
+  const found = markers.filter((m) => existsSync(join(projectRoot, m)));
+  if (found.length === 0) {
+    return {
+      label: "project      ",
+      level: "warn",
+      detail: `${projectRoot} has none of: ${markers.slice(0, 3).join(", ")} … — \`reasonix code\` will still run, but @-mentions and project memory have nothing to anchor`,
+    };
+  }
+  return {
+    label: "project      ",
+    level: "ok",
+    detail: `${projectRoot} (${found.join(", ")})`,
+  };
+}
+
+export async function doctorCommand(): Promise<void> {
+  loadDotenv();
+
+  const projectRoot = resolve(process.cwd());
+  console.log(`${color(`reasonix ${VERSION}  ·  doctor`, "1")}  (cwd: ${projectRoot})`);
+  console.log(`  home: ${homedir()}`);
+  console.log("");
+
+  // Run independent checks in parallel — saves ~5s when api-reach has
+  // to time out. Each handler swallows its own throws into a `fail`
+  // result so a thrown promise can't kill the whole report.
+  const checks = await Promise.all([
+    checkApiKey(),
+    checkConfig(),
+    checkApiReach(),
+    checkTokenizer(),
+    checkSessions(),
+    checkHooks(projectRoot),
+    checkOllama(projectRoot),
+    checkProject(projectRoot),
+  ]);
+
+  for (const c of checks) {
+    console.log(`  ${badge(c.level)}  ${c.label}  ${c.detail}`);
+  }
+
+  const ok = checks.filter((c) => c.level === "ok").length;
+  const warn = checks.filter((c) => c.level === "warn").length;
+  const fail = checks.filter((c) => c.level === "fail").length;
+  console.log("");
+  const summary = `${ok} ok · ${warn} warn · ${fail} fail`;
+  if (fail > 0) {
+    console.log(color(summary, "31"));
+    process.exit(1);
+  } else if (warn > 0) {
+    console.log(color(summary, "33"));
+  } else {
+    console.log(color(summary, "32"));
+  }
+}

src/cli/commands/events.ts

@@ -0,0 +1,134 @@
+import { eventLogPath } from "../../adapters/event-sink-jsonl.js";
+import { readEventLogFile } from "../../adapters/event-source-jsonl.js";
+import type { Event } from "../../core/events.js";
+import { replay as replayReducers } from "../../core/reducers.js";
+
+export interface EventsOptions {
+  name: string;
+  type?: string;
+  since?: number;
+  tail?: number;
+  json?: boolean;
+  projection?: boolean;
+}
+
+export function eventsCommand(opts: EventsOptions): void {
+  const path = eventLogPath(opts.name);
+  let events = readEventLogFile(path);
+
+  if (events.length === 0) {
+    console.error(`no events for session "${opts.name}"`);
+    console.error(`looked at: ${path}`);
+    console.error("(sessions auto-create the sidecar on first turn — has this session run yet?)");
+    process.exit(1);
+    return;
+  }
+
+  if (opts.type) events = events.filter((e) => e.type === opts.type);
+  if (opts.since !== undefined && Number.isFinite(opts.since)) {
+    events = events.filter((e) => e.id >= opts.since!);
+  }
+  if (opts.tail !== undefined && Number.isFinite(opts.tail) && opts.tail > 0) {
+    events = events.slice(-opts.tail);
+  }
+
+  if (opts.projection) {
+    const p = replayReducers(events);
+    console.log(JSON.stringify(p, mapReplacer, 2));
+    return;
+  }
+
+  if (opts.json) {
+    for (const e of events) console.log(JSON.stringify(e));
+    return;
+  }
+
+  console.log(`[events] ${opts.name}   ${events.length} event(s)   ${path}`);
+  console.log("");
+  for (const e of events) console.log(formatEvent(e));
+}
+
+function formatEvent(e: Event): string {
+  const id = String(e.id).padStart(4);
+  const turn = `t${e.turn}`.padEnd(4);
+  const ts = e.ts.replace("T", " ").replace(/\.\d+Z$/, "");
+  const type = e.type.padEnd(22);
+  return `[${id}] ${turn} ${ts}  ${type}  ${detailsFor(e)}`;
+}
+
+function detailsFor(e: Event): string {
+  switch (e.type) {
+    case "user.message":
+      return quote(e.text, 80);
+    case "slash.invoked":
+      return `/${e.name} ${e.args}`.trim();
+    case "model.turn.started":
+      return `model=${e.model} effort=${e.reasoningEffort} prefix=${e.prefixHash.slice(0, 8)}`;
+    case "model.delta":
+      return `${e.channel} ${quote(e.text, 60)}`;
+    case "model.final": {
+      const u = e.usage;
+      const tokens = `in=${u.prompt_tokens ?? 0} out=${u.completion_tokens ?? 0}`;
+      const tail = e.forcedSummary ? " [forcedSummary]" : "";
+      return `cost=$${e.costUsd.toFixed(4)} ${tokens}${tail}`;
+    }
+    case "tool.intent":
+      return `${e.callId} ${e.name} args=${truncate(e.args, 60)}`;
+    case "tool.dispatched":
+      return e.callId;
+    case "tool.denied":
+      return `${e.callId} reason=${e.reason}`;
+    case "tool.result":
+      return `${e.callId} ${e.ok ? "ok" : "err"} ${e.output.length}B${e.truncated ? " [trunc]" : ""}`;
+    case "effect.file.touched":
+      return `${e.mode} ${e.path} (${e.bytes}B)`;
+    case "effect.memory.written":
+      return `${e.scope}:${e.key}`;
+    case "plan.submitted":
+      return `${e.steps.length} step(s)`;
+    case "plan.step.completed":
+      return `${e.stepId}${e.title ? ` — ${e.title}` : ""}`;
+    case "checkpoint.created":
+      return `${e.checkpointId} "${e.name}" ${e.fileCount} file(s) ${e.bytes}B`;
+    case "checkpoint.restored":
+      return `${e.checkpointId} restored=${e.restored} removed=${e.removed} skipped=${e.skipped}`;
+    case "hook.fired":
+      return `${e.phase} ${e.hookName} → ${e.outcome}`;
+    case "policy.budget.warning":
+      return `$${e.spentUsd.toFixed(4)} / $${e.capUsd.toFixed(2)}`;
+    case "policy.budget.blocked":
+      return `$${e.spentUsd.toFixed(4)} / $${e.capUsd.toFixed(2)} BLOCKED`;
+    case "policy.escalated":
+      return `${e.fromModel} → ${e.toModel} (${e.reason})${e.rationale ? ` "${e.rationale}"` : ""}`;
+    case "session.opened":
+      return `${e.name} resumed-from-turn=${e.resumedFromTurn}`;
+    case "session.compacted":
+      return `${e.beforeMessages} → ${e.afterMessages} msgs (${e.reason})`;
+    case "capability.registered":
+      return `${e.name} ${e.permission}`;
+    case "capability.removed":
+      return e.name;
+    case "status":
+      return quote(e.text, 80);
+    case "error":
+      return `${e.recoverable ? "[recoverable] " : ""}${quote(e.message, 80)}`;
+    default:
+      return "";
+  }
+}
+
+function quote(s: string, max: number): string {
+  const flat = s.replace(/\s+/g, " ").trim();
+  return flat.length <= max ? `"${flat}"` : `"${flat.slice(0, max - 1)}…"`;
+}
+
+function truncate(s: string, max: number): string {
+  return s.length <= max ? s : `${s.slice(0, max - 1)}…`;
+}
+
+/** WorkspaceView holds files in a Map; default JSON.stringify drops it. */
+function mapReplacer(_key: string, value: unknown): unknown {
+  if (value instanceof Map) return Object.fromEntries(value);
+  if (value instanceof Set) return [...value];
+  return value;
+}

src/cli/commands/index.ts

@@ -0,0 +1,164 @@
+/** `reasonix index` — progress writes go to stderr so stdout stays pipeable. */
+
+import { resolve } from "node:path";
+import { buildIndex } from "../../index/semantic/builder.js";
+import type { BuildProgress, BuildResult } from "../../index/semantic/builder.js";
+import { t } from "../../index/semantic/i18n.js";
+import { ollamaPreflight } from "../../index/semantic/preflight.js";
+
+export interface IndexCommandOptions {
+  rebuild?: boolean;
+  model?: string;
+  dir?: string;
+  /** Ollama base URL override. */
+  ollamaUrl?: string;
+  /** Skip preflight prompts (yes to all). For scripts that already
+   *  know Ollama is set up. Default false. */
+  yes?: boolean;
+}
+
+export async function indexCommand(opts: IndexCommandOptions = {}): Promise<void> {
+  const root = resolve(opts.dir ?? process.cwd());
+  const tty = process.stderr.isTTY === true && process.stdin.isTTY === true;
+  const model = opts.model ?? process.env.REASONIX_EMBED_MODEL ?? "nomic-embed-text";
+
+  // Preflight: detect Ollama state and offer to fix what's missing.
+  // Runs before chunking so the user doesn't watch a scan finish only
+  // to hit "daemon not reachable" on the first embed call.
+  const preflightOk = await ollamaPreflight({
+    model,
+    baseUrl: opts.ollamaUrl,
+    interactive: tty && !opts.yes,
+    yesToAll: opts.yes ?? false,
+  });
+  if (!preflightOk) process.exit(1);
+
+  const writer = makeProgressWriter(tty);
+
+  const t0 = Date.now();
+  let result: BuildResult;
+  try {
+    result = await buildIndex(root, {
+      rebuild: opts.rebuild,
+      model,
+      baseUrl: opts.ollamaUrl,
+      onProgress: (p) => writer.update(p),
+    });
+  } catch (err) {
+    writer.clear();
+    const msg = err instanceof Error ? err.message : String(err);
+    process.stderr.write(t("indexFailed", { msg }));
+    process.exit(1);
+  }
+  writer.clear();
+
+  const seconds = ((Date.now() - t0) / 1000).toFixed(1);
+  const successKey = result.chunksSkipped > 0 ? "indexSuccessWithSkips" : "indexSuccess";
+  process.stderr.write(
+    t(successKey, {
+      scanned: result.filesScanned,
+      changed: result.filesChanged,
+      added: result.chunksAdded,
+      removed: result.chunksRemoved,
+      skipped: result.chunksSkipped,
+      seconds,
+    }),
+  );
+  if (result.filesChanged === 0 && !opts.rebuild) {
+    process.stderr.write(t("indexNothingToDo"));
+  }
+}
+
+interface ProgressWriter {
+  update(p: BuildProgress): void;
+  clear(): void;
+}
+
+const SPINNER_FRAMES = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"];
+const SPINNER_INTERVAL_MS = 120;
+
+function makeProgressWriter(tty: boolean): ProgressWriter {
+  if (!tty) return makeNonTtyWriter();
+  return makeTtyWriter();
+}
+
+function makeNonTtyWriter(): ProgressWriter {
+  let lastPhase: BuildProgress["phase"] | null = null;
+  let lastChunks = 0;
+  return {
+    update(p) {
+      if (p.phase !== lastPhase) {
+        lastPhase = p.phase;
+        if (p.phase === "scan") {
+          process.stderr.write(t("progressScanLine"));
+        } else if (p.phase === "embed") {
+          process.stderr.write(
+            t("progressEmbedLine", {
+              total: p.chunksTotal ?? 0,
+              files: p.filesChanged ?? 0,
+            }),
+          );
+        }
+      }
+      if (p.phase === "embed" && p.chunksDone !== undefined && p.chunksDone - lastChunks >= 50) {
+        lastChunks = p.chunksDone;
+        process.stderr.write(
+          t("progressEmbedHeartbeat", {
+            done: p.chunksDone,
+            total: p.chunksTotal ?? "?",
+          }),
+        );
+      }
+    },
+    clear() {
+      /* non-TTY keeps its accumulated lines */
+    },
+  };
+}
+
+/** Spinner ticks on its own setInterval so a hung embedder still shows liveness. */
+function makeTtyWriter(): ProgressWriter {
+  let status = t("progressStarting");
+  let lastLineLen = 0;
+  let frameIdx = 0;
+  const startTs = Date.now();
+
+  const repaint = () => {
+    const frame = SPINNER_FRAMES[frameIdx % SPINNER_FRAMES.length];
+    frameIdx++;
+    const elapsed = ((Date.now() - startTs) / 1000).toFixed(1);
+    const line = `${frame} ${status}  ${elapsed}s`;
+    const padded = line + " ".repeat(Math.max(0, lastLineLen - line.length));
+    process.stderr.write(`\r${padded}`);
+    lastLineLen = line.length;
+  };
+
+  // Paint the initial frame immediately so the user sees text on
+  // line one — don't wait for the first interval tick.
+  repaint();
+  const interval = setInterval(repaint, SPINNER_INTERVAL_MS);
+
+  return {
+    update(p) {
+      if (p.phase === "scan") {
+        status = t("progressScan", { files: p.filesScanned ?? 0 });
+      } else if (p.phase === "embed") {
+        const done = p.chunksDone ?? 0;
+        const total = p.chunksTotal ?? 0;
+        const pct = total > 0 ? ((done / total) * 100).toFixed(0) : "0";
+        status = t("progressEmbed", { done, total, pct });
+      }
+      // Repaint immediately on event arrival so the new counter
+      // shows up before the next interval tick (avoids a 120ms lag
+      // on each progress update).
+      repaint();
+    },
+    clear() {
+      clearInterval(interval);
+      if (lastLineLen > 0) {
+        process.stderr.write(`\r${" ".repeat(lastLineLen)}\r`);
+        lastLineLen = 0;
+      }
+    },
+  };
+}

src/cli/commands/mcp-inspect.ts

@@ -1,20 +1,10 @@
-/**
- * `reasonix mcp inspect <spec>` — connect to one MCP server, list
- * everything it exposes (tools, resources, prompts), print a
- * human-readable summary. Useful as:
- *   - a diagnostic tool for "does my MCP server even work?"
- *   - a discovery tool for "what can this server do?"
- *   - the only CLI surface for the resources+prompts methods added
- *     in 0.4.5 (chat mode consumes tools but hasn't wired up the
- *     other two families yet).
- */
-
 import { McpClient } from "../../mcp/client.js";
 import { inspectMcpServer } from "../../mcp/inspect.js";
 import type { InspectionReport } from "../../mcp/inspect.js";
 import { parseMcpSpec } from "../../mcp/spec.js";
 import { SseTransport } from "../../mcp/sse.js";
 import { type McpTransport, StdioTransport } from "../../mcp/stdio.js";
+import { StreamableHttpTransport } from "../../mcp/streamable-http.js";
 
 export interface McpInspectOptions {
   /** The raw --mcp spec string (e.g. `fs=npx -y @modelcontextprotocol/server-filesystem .`). */
@@ -28,7 +18,9 @@ export async function mcpInspectCommand(opts: McpInspectOptions): Promise<void>
   const transport: McpTransport =
     spec.transport === "sse"
       ? new SseTransport({ url: spec.url })
-      : new StdioTransport({ command: spec.command, args: spec.args });
+      : spec.transport === "streamable-http"
+        ? new StreamableHttpTransport({ url: spec.url })
+        : new StdioTransport({ command: spec.command, args: spec.args });
   const client = new McpClient({ transport });
   try {
     await client.initialize();

src/cli/commands/mcp.ts

@@ -1,11 +1,3 @@
-/**
- * `reasonix mcp <subcmd>` — the MCP discovery / helper surface.
- *
- * Currently one subcommand: `list`. Prints a curated catalog of popular
- * MCP servers with their `--mcp` commands ready to copy-paste. More
- * subcommands (`init`, `try`, etc.) may land in later alphas.
- */
-
 import { MCP_CATALOG, mcpCommandFor } from "../../mcp/catalog.js";
 
 export interface McpListOptions {

src/cli/commands/replay.ts

@@ -1,7 +1,7 @@
 import { render } from "ink";
 import React from "react";
-import { groupRecordsByTurn, replayFromFile } from "../../replay.js";
-import type { TranscriptRecord } from "../../transcript.js";
+import type { TranscriptRecord } from "../../transcript/log.js";
+import { groupRecordsByTurn, replayFromFile } from "../../transcript/replay.js";
 import { ReplayApp } from "../ui/ReplayApp.js";
 
 export interface ReplayOptions {
@@ -12,13 +12,6 @@ export interface ReplayOptions {
   print?: boolean;
 }
 
-/**
- * Replay a transcript. Two modes:
- *   - Interactive TUI (default when stdout is a TTY): Ink-based j/k navigation.
- *   - Stdout pretty-print (--print, or when stdout is piped): one-shot text
- *     dump + summary. Kept working so shell pipes, CI logs, and `less`
- *     workflows still behave sensibly.
- */
 export async function replayCommand(opts: ReplayOptions): Promise<void> {
   const wantPrint =
     opts.print || !process.stdout.isTTY || opts.head !== undefined || opts.tail !== undefined;
@@ -36,7 +29,6 @@ export async function replayCommand(opts: ReplayOptions): Promise<void> {
   await waitUntilExit();
 }
 
-// ----------------------------------------------------------------------------
 // stdout pretty-print path (original behavior, preserved for piping / CI)
 
 function printReplay(opts: ReplayOptions): void {

src/cli/commands/run.ts

@@ -9,9 +9,10 @@ import { bridgeMcpTools } from "../../mcp/registry.js";
 import { parseMcpSpec } from "../../mcp/spec.js";
 import { SseTransport } from "../../mcp/sse.js";
 import { type McpTransport, StdioTransport } from "../../mcp/stdio.js";
+import { StreamableHttpTransport } from "../../mcp/streamable-http.js";
+import { appendUsage } from "../../telemetry/usage.js";
 import { ToolRegistry } from "../../tools.js";
-import { openTranscriptFile, recordFromLoopEvent, writeRecord } from "../../transcript.js";
-import { appendUsage } from "../../usage.js";
+import { openTranscriptFile, recordFromLoopEvent, writeRecord } from "../../transcript/log.js";
 
 export interface RunOptions {
   task: string;
@@ -21,6 +22,7 @@ export interface RunOptions {
   harvest?: boolean;
   /** Self-consistency budget. > 1 runs N parallel samples and picks the best. */
   branch?: number;
+  budgetUsd?: number;
   /** JSONL transcript path — lets `reasonix replay` / `diff` audit this run. */
   transcript?: string;
   /** Zero or more MCP server specs. Each: `"name=cmd args..."` or `"cmd args..."`. */
@@ -86,12 +88,16 @@ export async function runCommand(opts: RunOptions): Promise<void> {
         const transport: McpTransport =
           spec.transport === "sse"
             ? new SseTransport({ url: spec.url })
-            : new StdioTransport({ command: spec.command, args: spec.args });
+            : spec.transport === "streamable-http"
+              ? new StreamableHttpTransport({ url: spec.url })
+              : new StdioTransport({ command: spec.command, args: spec.args });
         const mcp = new McpClient({ transport });
         await mcp.initialize();
         const bridge = await bridgeMcpTools(mcp, { registry: tools, namePrefix: prefix });
         const source =
-          spec.transport === "sse" ? spec.url : `${spec.command} ${spec.args.join(" ")}`;
+          spec.transport === "sse" || spec.transport === "streamable-http"
+            ? spec.url
+            : `${spec.command} ${spec.args.join(" ")}`;
         process.stderr.write(
           `▸ MCP[${spec.name ?? "anon"}]: ${bridge.registeredNames.length} tool(s) from ${source}\n`,
         );
@@ -122,6 +128,7 @@ export async function runCommand(opts: RunOptions): Promise<void> {
     model: opts.model,
     harvest: opts.harvest,
     branch: opts.branch,
+    budgetUsd: opts.budgetUsd,
   });
   const prefixHash = prefix.fingerprint;
 

src/cli/commands/sessions.ts

@@ -1,14 +1,3 @@
-/**
- * `reasonix sessions` — CLI equivalent of the `/sessions` slash command.
- *
- * Two modes:
- *   - `reasonix sessions`           list every session under ~/.reasonix/sessions/
- *   - `reasonix sessions <name>`    dump one session's messages in readable form
- *
- * Neither needs an API key — pure filesystem reads of JSONL files written
- * by previous chat runs.
- */
-
 import { listSessions, loadSessionMessages, sessionPath } from "../../index.js";
 import type { ChatMessage } from "../../index.js";
 

src/cli/commands/stats.ts

@@ -1,20 +1,4 @@
-/**
- * `reasonix stats` — two modes, decided by whether the user passed
- * a transcript path.
- *
- *   - `reasonix stats`          → cross-session usage dashboard
- *                                  (reads `~/.reasonix/usage.jsonl`)
- *   - `reasonix stats <path>`   → summary of a single JSONL transcript
- *                                  (original v0.1 behavior, kept so
- *                                   existing scripts don't break)
- *
- * The dashboard is the new story: for every turn `reasonix chat|code|run`
- * has ever executed on this machine, we aggregate tokens + cost + the
- * equivalent Claude spend, and print rolling-window totals (today /
- * week / month / all-time). The savings column is the Pillar 1 pitch
- * made concrete — "you paid $X; Claude would have charged $Y, a N%
- * reduction."
- */
+/** `reasonix stats [path]` — path arg switches to per-transcript mode; default is the cross-session dashboard. */
 
 import { existsSync, readFileSync } from "node:fs";
 import {
@@ -26,7 +10,7 @@ import {
   defaultUsageLogPath,
   formatLogSize,
   readUsageLog,
-} from "../../usage.js";
+} from "../../telemetry/usage.js";
 
 export interface StatsOptions {
   /** Optional transcript path. Absent → dashboard mode. */
@@ -45,10 +29,6 @@ export function statsCommand(opts: StatsOptions): void {
   dashboard(opts);
 }
 
-// ---------------------------------------------------------------------
-// Transcript summary — legacy v0.1 behavior, preserved verbatim.
-// ---------------------------------------------------------------------
-
 function transcriptSummary(path: string): void {
   if (!existsSync(path)) {
     console.error(`no such transcript: ${path}`);
@@ -74,10 +54,6 @@ function transcriptSummary(path: string): void {
   console.log(`last turn index:  ${lastTurn}`);
 }
 
-// ---------------------------------------------------------------------
-// Dashboard — aggregates ~/.reasonix/usage.jsonl.
-// ---------------------------------------------------------------------
-
 function dashboard(opts: StatsOptions): void {
   const path = opts.logPath ?? defaultUsageLogPath();
   const records = readUsageLog(path);
@@ -154,18 +130,21 @@ function renderSubagentSection(sub: NonNullable<UsageAggregate["subagents"]>): s
 
 function header(): string {
   // Fixed column widths so alignment works in any TTY.
+  // `cache saved` reports DeepSeek's hit-vs-miss USD diff; the existing
+  // `saved` column is the % saved vs Claude-Sonnet equivalent.
   return [
     pad("", 10),
     pad("turns", 8, "right"),
     pad("cache hit", 10, "right"),
     pad("cost (USD)", 14, "right"),
+    pad("cache saved", 14, "right"),
     pad("vs Claude", 14, "right"),
     pad("saved", 10, "right"),
   ].join("  ");
 }
 
 function divider(): string {
-  return "-".repeat(70);
+  return "-".repeat(86);
 }
 
 function bucketRow(b: UsageBucket): string {
@@ -176,6 +155,11 @@ function bucketRow(b: UsageBucket): string {
     pad(b.turns.toString(), 8, "right"),
     pad(b.turns > 0 ? `${(hit * 100).toFixed(1)}%` : "—", 10, "right"),
     pad(b.turns > 0 ? `$${b.costUsd.toFixed(6)}` : "—", 14, "right"),
+    pad(
+      b.turns > 0 && b.cacheSavingsUsd > 0 ? `$${b.cacheSavingsUsd.toFixed(4)}` : "—",
+      14,
+      "right",
+    ),
     pad(b.turns > 0 ? `$${b.claudeEquivUsd.toFixed(4)}` : "—", 14, "right"),
     pad(b.turns > 0 && savings > 0 ? `${(savings * 100).toFixed(1)}%` : "—", 10, "right"),
   ].join("  ");

src/cli/commands/update.ts

@@ -1,17 +1,3 @@
-/**
- * `reasonix update` — self-upgrade command.
- *
- * Talks to the npm registry, compares against the running version,
- * and either runs `npm install -g reasonix@latest` (global install)
- * or advises how to refresh the npx cache (ephemeral install).
- *
- * The decision logic is factored into `planUpdate()` so it can be
- * unit-tested without spawning child processes or hitting the
- * network. `updateCommand()` is the thin CLI wrapper that calls
- * `getLatestVersion`, passes the result into `planUpdate`, and
- * executes any suggested command.
- */
-
 import { spawn } from "node:child_process";
 import { VERSION, compareVersions, getLatestVersion, isNpxInstall } from "../../version.js";
 
@@ -21,11 +7,6 @@ export interface UpdatePlan {
   action: UpdateAction;
   /** Human-readable summary; the CLI prints this verbatim. */
   message: string;
-  /**
-   * Argv for the install command when `action === "run-npm-install"`.
-   * Absent otherwise. Kept as array so the CLI can pass it straight
-   * to `spawn` without re-parsing shell syntax.
-   */
   command?: string[];
 }
 
@@ -36,15 +17,7 @@ export interface PlanUpdateInput {
   npx?: boolean;
 }
 
-/**
- * Pure decision function: given current + latest + install kind,
- * decide what the CLI should do. No I/O.
- *
- *   newer-local     — current > latest (dev build, local publish)
- *   up-to-date      — current === latest
- *   npx-hint        — current < latest AND running under npx
- *   run-npm-install — current < latest AND running as a real install
- */
+/** Pure decision — split out so tests don't need to spawn child processes or hit the network. */
 export function planUpdate(input: PlanUpdateInput): UpdatePlan {
   const diff = compareVersions(input.current, input.latest);
   if (diff > 0) {
@@ -105,11 +78,6 @@ function defaultSpawn(argv: string[]): Promise<number> {
   });
 }
 
-/**
- * Run the update command. Prints a banner, resolves the latest
- * version, prints the plan, and (unless `--dry-run`) executes the
- * install when applicable.
- */
 export async function updateCommand(opts: UpdateCommandOptions = {}): Promise<void> {
   const write = opts.write ?? ((m: string) => process.stdout.write(m));
   const exit = opts.exit ?? ((c: number) => process.exit(c));

src/cli/index.ts

@@ -1,10 +1,16 @@
 import { Command } from "commander";
 import { readConfig } from "../config.js";
 import { VERSION } from "../index.js";
-import { applyMemoryStack } from "../user-memory.js";
+import { listSessions } from "../memory/session.js";
+import { applyMemoryStack } from "../memory/user.js";
+import { ESCALATION_CONTRACT } from "../prompt-fragments.js";
 import { chatCommand } from "./commands/chat.js";
 import { codeCommand } from "./commands/code.js";
+import { commitCommand } from "./commands/commit.js";
 import { diffCommand } from "./commands/diff.js";
+import { doctorCommand } from "./commands/doctor.js";
+import { eventsCommand } from "./commands/events.js";
+import { indexCommand } from "./commands/index.js";
 import { mcpInspectCommand } from "./commands/mcp-inspect.js";
 import { mcpListCommand } from "./commands/mcp.js";
 import { replayCommand } from "./commands/replay.js";
@@ -14,7 +20,7 @@ import { setupCommand } from "./commands/setup.js";
 import { statsCommand } from "./commands/stats.js";
 import { updateCommand } from "./commands/update.js";
 import { versionCommand } from "./commands/version.js";
-import { resolveDefaults } from "./resolve.js";
+import { resolveContinueFlag, resolveDefaults } from "./resolve.js";
 
 const DEFAULT_SYSTEM = `You are Reasonix, a helpful DeepSeek-powered assistant. Be concise and accurate. Use tools when available.
 
@@ -28,33 +34,64 @@ Every factual claim about a codebase must be backed by evidence. Reasonix VALIDA
 
 **Negative claims** ("X is missing", "Y isn't implemented", "lacks Z") are the #1 hallucination shape. STOP before writing them. If you have a search tool, call it first; if the search returns nothing, cite the search itself as evidence (\`No matches for "foo" in src/\`). If you have no tool, qualify hard: "I haven't verified — this is a guess."
 
-Asserting absence without checking is how evaluative answers go wrong. Treat the urge to write "missing" as a red flag in your own reasoning.`;
+Asserting absence without checking is how evaluative answers go wrong. Treat the urge to write "missing" as a red flag in your own reasoning.
+
+# Don't invent what changes — search instead
+
+Your training data has a cutoff. When an answer's correctness depends on something that changes over time (the user is asking what's happening, not what's true) and a search tool is available, search first. Inventing currently-correct values from training memory is the most common way these answers go wrong, and the user usually can't tell until much later.
+
+The signal isn't a topic list — it's: "if I'm wrong about this, is it because reality moved on?". If yes, ground the answer in fresh evidence; if no (definitions, mechanisms, well-established APIs), answer from memory.
+
+${ESCALATION_CONTRACT}`;
+
+/** Lenient: malformed → undefined (no cap) so a bad flag doesn't abort launch. */
+function parseBudgetFlag(raw: number | undefined): number | undefined {
+  if (raw === undefined) return undefined;
+  if (!Number.isFinite(raw) || raw <= 0) {
+    process.stderr.write(
+      `▲ ignoring --budget=${raw} (must be a positive number) — running with no cap\n`,
+    );
+    return undefined;
+  }
+  return raw;
+}
 
 const program = new Command();
 program
   .name("reasonix")
   .description("DeepSeek-native agent framework — built for cache hits and cheap tokens.")
-  .version(VERSION);
+  .version(VERSION)
+  .option(
+    "-c, --continue",
+    "Resume the most recently used chat session without showing the picker.",
+  );
 
 // `reasonix` with no subcommand → launch the friendliest flow.
 // First run (no config yet) → interactive setup wizard.
 // Otherwise → chat with saved defaults. This is the "one command to
 // rule them all" entry for non-power-users: they don't need to learn
 // `chat` / `setup` / `--mcp` — just type `reasonix`.
-program.action(async () => {
+program.action(async (opts: { continue?: boolean }) => {
   const cfg = readConfig();
   if (!cfg.setupCompleted) {
     await setupCommand({});
     return;
   }
   const defaults = resolveDefaults({});
+  const continueOpts = resolveContinueFlag(
+    opts.continue,
+    defaults.session,
+    () => listSessions()[0],
+    (msg) => process.stderr.write(`${msg}\n`),
+  );
   await chatCommand({
     model: defaults.model,
     system: applyMemoryStack(DEFAULT_SYSTEM, process.cwd()),
     harvest: defaults.harvest,
     branch: defaults.branch,
-    session: defaults.session,
+    session: continueOpts.session,
     mcp: defaults.mcp,
+    forceResume: continueOpts.forceResume,
   });
 });
 
@@ -68,16 +105,25 @@ program
 program
   .command("code [dir]")
   .description(
-    "Code-editing chat — filesystem tools rooted at <dir> (default: cwd), coding system prompt, deepseek-reasoner. Model proposes SEARCH/REPLACE blocks; Reasonix applies them to disk.",
+    "Code-editing chat — filesystem tools rooted at <dir> (default: cwd), coding system prompt, v4-flash baseline. Model proposes SEARCH/REPLACE blocks; Reasonix applies them to disk. Use /preset pro or /pro to lock v4-pro on hard tasks.",
   )
-  .option("-m, --model <id>", "Override default reasoner model")
+  .option("-m, --model <id>", "Override default model (v4-flash)")
   .option("--no-session", "Disable session persistence for this run")
   .option("-r, --resume", "Skip the session picker — always continue prior messages")
   .option("-n, --new", "Skip the session picker — always wipe prior messages and start fresh")
   .option("--transcript <path>", "Write a JSONL transcript to this path")
   .option(
     "--harvest",
-    "Extract typed plan state from R1 reasoning (Pillar 2). Adds ~10-15% cost per turn. Off by default in code mode.",
+    "Opt-in Pillar-2 plan-state extraction. Adds one flash call per turn; off by default (no preset enables it).",
+  )
+  .option(
+    "--budget <usd>",
+    "Soft USD cap on session spend. Off by default. Warns at 80%, refuses next turn at 100%. Mid-session: /budget <usd> or /budget off.",
+    (v) => Number.parseFloat(v),
+  )
+  .option(
+    "--no-dashboard",
+    "Suppress the auto-launched embedded web dashboard. Default behavior boots it on TUI mount and shows the URL in the status bar (clickable in OSC-8-aware terminals).",
   )
   .action(async (dir: string | undefined, opts) => {
     await codeCommand({
@@ -88,6 +134,8 @@ program
       forceResume: !!opts.resume,
       forceNew: !!opts.new,
       harvest: !!opts.harvest,
+      budgetUsd: parseBudgetFlag(opts.budget),
+      noDashboard: opts.dashboard === false,
     });
   });
 
@@ -99,20 +147,29 @@ program
   .option("--transcript <path>", "Write a JSONL transcript to this path")
   .option(
     "--preset <name>",
-    "Bundle of model + harvest + branch. One of: fast, smart, max. Overrides config.preset.",
+    "Model bundle. One of: auto (flash → pro on hard turns, default), flash (always flash), pro (always pro). Overrides config.preset.",
   )
   .option(
     "--harvest",
-    "Extract typed plan state from R1 reasoning (Pillar 2). Overrides preset's harvest setting.",
+    "Opt-in Pillar-2 plan-state extraction. Off by default — no preset enables it.",
   )
   .option(
     "--branch <n>",
-    "Self-consistency: run N parallel samples per turn and pick the most confident (disables streaming; enables harvest)",
+    "Self-consistency: run N parallel samples per turn (N× cost). Manual only — never auto-enabled.",
     (v) => Number.parseInt(v, 10),
   )
+  .option(
+    "--budget <usd>",
+    "Soft USD cap on session spend. Off by default. Warns at 80%, refuses next turn at 100%. Mid-session: /budget <usd> or /budget off.",
+    (v) => Number.parseFloat(v),
+  )
   .option("--session <name>", "Use a named session (default: from config, usually 'default').")
   .option("--no-session", "Disable session persistence for this run (ephemeral chat)")
   .option("-r, --resume", "Skip the session picker — always continue prior messages")
+  .option(
+    "-c, --continue",
+    "Resume the most-recently-used session (any name) without showing the picker.",
+  )
   .option("-n, --new", "Skip the session picker — always wipe prior messages and start fresh")
   .option(
     "--mcp <spec>",
@@ -125,6 +182,10 @@ program
     "Global prefix applied to every MCP tool (only honored when no per-spec name is set; avoids collisions with a single anonymous server)",
   )
   .option("--no-config", "Ignore `~/.reasonix/config.json` — useful for CI or reproducing issues")
+  .option(
+    "--no-dashboard",
+    "Suppress the auto-launched embedded web dashboard. Default behavior boots it on TUI mount and shows the URL in the status bar (clickable in OSC-8-aware terminals).",
+  )
   .action(async (opts) => {
     const defaults = resolveDefaults({
       model: opts.model,
@@ -135,17 +196,31 @@ program
       preset: opts.preset,
       noConfig: opts.config === false,
     });
+    // `-c` is "newest-touched session" + auto-resume; `-r` is "this
+    // session's prior messages, even if you also passed --session".
+    // When both are set we prefer the explicit `--session` + `-r`
+    // (more specific input wins). `-c` only kicks in if `-r` wasn't.
+    const continueOpts = opts.resume
+      ? { session: defaults.session, forceResume: true }
+      : resolveContinueFlag(
+          opts.continue,
+          defaults.session,
+          () => listSessions()[0],
+          (msg) => process.stderr.write(`${msg}\n`),
+        );
     await chatCommand({
       model: defaults.model,
       system: applyMemoryStack(opts.system, process.cwd()),
       transcript: opts.transcript,
       harvest: defaults.harvest,
       branch: defaults.branch,
-      session: defaults.session,
+      budgetUsd: parseBudgetFlag(opts.budget),
+      session: continueOpts.session,
       mcp: defaults.mcp,
       mcpPrefix: opts.mcpPrefix,
-      forceResume: !!opts.resume,
+      forceResume: continueOpts.forceResume,
       forceNew: !!opts.new,
+      noDashboard: opts.dashboard === false,
     });
   });
 
@@ -154,13 +229,18 @@ program
   .description("Run a single task non-interactively, streaming output.")
   .option("-m, --model <id>", "DeepSeek model id (overrides preset)")
   .option("-s, --system <prompt>", "System prompt", DEFAULT_SYSTEM)
-  .option("--preset <name>", "Bundle of model + harvest + branch: fast | smart | max")
+  .option("--preset <name>", "Model bundle: auto | flash | pro (default: auto)")
   .option("--harvest", "Extract typed plan state from R1 reasoning (Pillar 2)")
   .option(
     "--branch <n>",
     "Self-consistency: run N parallel samples per turn and pick the most confident",
     (v) => Number.parseInt(v, 10),
   )
+  .option(
+    "--budget <usd>",
+    "Soft USD cap on session spend. Off by default. Refuses to start a new turn once cumulative cost ≥ cap.",
+    (v) => Number.parseFloat(v),
+  )
   .option("--transcript <path>", "Write a JSONL transcript to this path for replay/diff")
   .option(
     "--mcp <spec>",
@@ -188,6 +268,7 @@ program
       system: applyMemoryStack(opts.system, process.cwd()),
       harvest: defaults.harvest,
       branch: defaults.branch,
+      budgetUsd: parseBudgetFlag(opts.budget),
       transcript: opts.transcript,
       mcp: defaults.mcp,
       mcpPrefix: opts.mcpPrefix,
@@ -204,6 +285,29 @@ program
     statsCommand({ transcript });
   });
 
+program
+  .command("doctor")
+  .description(
+    "One-command health check — API key, config, /user/balance reachability, tokenizer, sessions, hooks, Ollama (if used), project markers. Exit 1 on any fail; 0 on warn / clean.",
+  )
+  .action(async () => {
+    await doctorCommand();
+  });
+
+program
+  .command("commit")
+  .description(
+    "Draft a commit message from the staged diff (or working tree, if nothing staged), matching your repo's recent commit style. Review interactively before it lands.",
+  )
+  .option("-m, --model <id>", "Override the default model (deepseek-v4-flash)")
+  .option(
+    "-y, --yes",
+    "Skip the [a]ccept / [r]egenerate prompt and commit the first draft. Useful in scripts.",
+  )
+  .action(async (opts) => {
+    await commitCommand({ model: opts.model, yes: !!opts.yes });
+  });
+
 program
   .command("sessions [name]")
   .description("List saved chat sessions, or inspect one by name.")
@@ -212,6 +316,30 @@ program
     sessionsCommand({ name, verbose: !!opts.verbose });
   });
 
+program
+  .command("events <name>")
+  .description(
+    "Pretty-print the kernel event-log sidecar (~/.reasonix/sessions/<name>.events.jsonl) — every typed Event the session produced.",
+  )
+  .option("--type <type>", "Show only events of this type (e.g., tool.intent)")
+  .option("--since <id>", "Show only events with id >= N", (v) => Number.parseInt(v, 10))
+  .option("--tail <n>", "Show only the last N events", (v) => Number.parseInt(v, 10))
+  .option("--json", "Emit raw JSONL passthrough instead of formatted lines (for jq pipelines)")
+  .option(
+    "--projection",
+    "Replace the listing with the final reduced ProjectionSet (conversation, budget, plan, …)",
+  )
+  .action((name: string, opts) => {
+    eventsCommand({
+      name,
+      type: opts.type,
+      since: Number.isFinite(opts.since) ? opts.since : undefined,
+      tail: Number.isFinite(opts.tail) ? opts.tail : undefined,
+      json: !!opts.json,
+      projection: !!opts.projection,
+    });
+  });
+
 program
   .command("replay <transcript>")
   .description(
@@ -290,6 +418,31 @@ program
     await updateCommand({ dryRun: !!opts.dryRun });
   });
 
+program
+  .command("index")
+  .description(
+    "Build (or incrementally refresh) a local semantic search index for the project so `reasonix code` can answer 'where do we…' questions by meaning, not just by token. Uses Ollama as the embedding backend; missing daemon / model is offered to the user with a confirm prompt.",
+  )
+  .option("--rebuild", "Wipe and rebuild from scratch")
+  .option("--model <name>", "Embedding model (default: nomic-embed-text)")
+  .option("--dir <path>", "Project root to index (default: cwd)")
+  .option("--ollama-url <url>", "Override Ollama base URL (default: http://localhost:11434)")
+  .option(
+    "-y, --yes",
+    "Skip preflight prompts — auto-start the daemon and pull the model if missing (use in scripts)",
+  )
+  .action(
+    async (opts: {
+      rebuild?: boolean;
+      model?: string;
+      dir?: string;
+      ollamaUrl?: string;
+      yes?: boolean;
+    }) => {
+      await indexCommand(opts);
+    },
+  );
+
 program.parseAsync(process.argv).catch((err) => {
   console.error(err);
   process.exit(1);

src/cli/resolve.ts

@@ -1,23 +1,11 @@
-/**
- * Merge config defaults with CLI flags into the concrete options that
- * `chatCommand` / `runCommand` need.
- *
- * Precedence (highest wins):
- *   1. Explicit per-setting CLI flag (`--model`, `--harvest`, `--branch`, `--mcp`)
- *   2. Explicit `--preset <name>` CLI flag
- *   3. `config.preset` from `~/.reasonix/config.json` (set by `reasonix setup`)
- *   4. Hardcoded "fast" preset defaults
- *
- * Keeping this logic in one place — rather than duplicating across
- * `chat` and `run` — means the precedence rule only lives in one unit
- * test and the shape of the merge is identical for both commands.
- */
+/** Precedence: per-setting flag > --preset > config.preset > "auto" defaults. */
 
 import { type PresetName, type ReasonixConfig, readConfig } from "../config.js";
-import { PRESETS } from "./ui/presets.js";
+import { resolvePreset } from "./ui/presets.js";
 
 export interface ResolvedDefaults {
   model: string;
+  reasoningEffort: "high" | "max";
   harvest: boolean;
   branch: number | undefined;
   mcp: string[];
@@ -41,9 +29,10 @@ export interface RawCliFlags {
 export function resolveDefaults(flags: RawCliFlags): ResolvedDefaults {
   const cfg: ReasonixConfig = flags.noConfig ? {} : readConfig();
   const preset = pickPreset(flags.preset, cfg.preset);
-  const presetSettings = PRESETS[preset];
+  const presetSettings = resolvePreset(preset);
 
   const model = flags.model ?? presetSettings.model;
+  const reasoningEffort = presetSettings.reasoningEffort;
   const harvest = flags.harvest === true ? true : presetSettings.harvest;
   const branchFromFlag = normalizeBranch(flags.branch);
   const branch = branchFromFlag ?? (presetSettings.branch > 1 ? presetSettings.branch : undefined);
@@ -55,7 +44,7 @@ export function resolveDefaults(flags: RawCliFlags): ResolvedDefaults {
 
   const session = resolveSession(flags.session, cfg.session);
 
-  return { model, harvest, branch, mcp, session };
+  return { model, reasoningEffort, harvest, branch, mcp, session };
 }
 
 function pickPreset(
@@ -64,11 +53,20 @@ function pickPreset(
 ): PresetName {
   if (flagPreset && isPresetName(flagPreset)) return flagPreset;
   if (configPreset) return configPreset;
-  return "fast";
+  return "auto";
 }
 
 function isPresetName(s: string): s is PresetName {
-  return s === "fast" || s === "smart" || s === "max";
+  return (
+    s === "auto" ||
+    s === "flash" ||
+    s === "pro" ||
+    // Legacy names — kept callable so old `--preset smart` invocations
+    // and stale config.json entries don't error out.
+    s === "fast" ||
+    s === "smart" ||
+    s === "max"
+  );
 }
 
 function normalizeBranch(raw: number | undefined): number | undefined {
@@ -87,3 +85,18 @@ function resolveSession(
   if (typeof configSession === "string" && configSession.length > 0) return configSession;
   return "default";
 }
+
+export function resolveContinueFlag(
+  flag: boolean | undefined,
+  fallbackSession: string | undefined,
+  getLatestSession: () => { name: string } | undefined,
+  warn: (msg: string) => void = () => {},
+): { session: string | undefined; forceResume: boolean } {
+  if (!flag) return { session: fallbackSession, forceResume: false };
+  const latest = getLatestSession();
+  if (!latest) {
+    warn("▸ -c/--continue: no saved sessions yet — starting a fresh one.");
+    return { session: fallbackSession, forceResume: false };
+  }
+  return { session: latest.name, forceResume: true };
+}

src/cli/ui/AtMentionSuggestions.tsx

@@ -1,6 +1,7 @@
 import { Box, Text } from "ink";
 // biome-ignore lint/style/useImportType: tsconfig.jsx = "react" needs React in value scope for JSX compilation
 import React from "react";
+import { COLOR, GLYPH } from "./theme.js";
 
 export interface AtMentionSuggestionsProps {
   /**
@@ -16,11 +17,21 @@ export interface AtMentionSuggestionsProps {
 }
 
 /**
- * Floating `@`-mention picker. Rendered below the input box when the
- * user is typing an `@…` prefix in code mode. Navigation state lives
- * in the parent (App.tsx owns `atSelected`) — this component is pure
- * display. Mirrors {@link SlashSuggestions} shape so the keybindings
- * and layout feel identical across the two pickers.
+ * `@`-mention picker. Rendered below the input box while the user is
+ * typing an `@…` prefix in code mode. Visual grammar matches the
+ * design's file picker:
+ *
+ *      @ files matching "auth"                              esc
+ *      ▸ login.ts          src/auth/
+ *        refresh.ts        src/auth/
+ *        validators.ts     src/auth/
+ *        auth.test.ts      tests/
+ *      [↑↓] navigate · Tab / ⏎ insert as @path · file content inlined
+ *
+ * Basename in primary cyan (the user's eye lands here first), dir
+ * suffix in dim info color. No solid-bg pill on the selected row —
+ * leading ▸ + bold + brighter color does the same job without the
+ * loud bg block. Mirrors {@link SlashSuggestions}.
  */
 export function AtMentionSuggestions({
   matches,
@@ -30,12 +41,13 @@ export function AtMentionSuggestions({
   if (matches === null) return null;
   if (matches.length === 0) {
     return (
-      <Box paddingX={1}>
-        <Text color="yellow">no files match "@{query}"</Text>
-        <Text dimColor>
-          {" "}
-          — keep typing, or Backspace to edit. Paths resolve from the code root.
+      <Box paddingX={1} marginTop={1}>
+        <Text color={COLOR.warn} bold>
+          {GLYPH.warn}
         </Text>
+        <Text> </Text>
+        <Text color={COLOR.warn}>{`no files match "@${query}"`}</Text>
+        <Text dimColor>{" — keep typing or Backspace; paths resolve from the code root"}</Text>
       </Box>
     );
   }
@@ -47,40 +59,46 @@ export function AtMentionSuggestions({
   const hiddenAbove = windowStart;
   const hiddenBelow = total - windowStart - shown.length;
   return (
-    <Box flexDirection="column" paddingX={1}>
-      {hiddenAbove > 0 ? <Text dimColor> ↑ {hiddenAbove} more above</Text> : null}
+    <Box flexDirection="column" paddingX={1} marginTop={1}>
+      <Box>
+        <Text color={COLOR.primary} bold>
+          {"@ "}
+        </Text>
+        <Text dimColor>
+          {query
+            ? `${total} match${total === 1 ? "" : "es"} for "${query}"`
+            : `${total} file${total === 1 ? "" : "s"}`}
+        </Text>
+        {hiddenAbove > 0 ? <Text dimColor>{`   ↑ ${hiddenAbove} above`}</Text> : null}
+      </Box>
       {shown.map((path, i) => (
         <FileRow key={path} path={path} isSelected={windowStart + i === selectedIndex} />
       ))}
-      {hiddenBelow > 0 ? <Text dimColor> ↓ {hiddenBelow} more below</Text> : null}
-      <Text dimColor> [↑↓] navigate · [Tab]/[Enter] pick · file content inlined on send</Text>
+      {hiddenBelow > 0 ? <Text dimColor>{`   ↓ ${hiddenBelow} below`}</Text> : null}
+      <Box marginTop={0}>
+        <Text dimColor>{"  ↑↓ navigate · Tab / ⏎ insert as @path · esc cancel"}</Text>
+      </Box>
     </Box>
   );
 }
 
 function FileRow({ path, isSelected }: { path: string; isSelected: boolean }) {
-  const marker = isSelected ? "▸" : " ";
   // Split the path so the basename visually pops — same dropdown
-  // affordance as VS Code's Quick Open.
+  // affordance as VS Code's Quick Open. Basename in primary cyan
+  // (selected: bold), dir suffix in dim info color so the eye lands
+  // on the filename first and uses the path only as a disambiguator.
   const slash = path.lastIndexOf("/");
   const dir = slash >= 0 ? `${path.slice(0, slash)}/` : "";
   const base = slash >= 0 ? path.slice(slash + 1) : path;
-  if (isSelected) {
-    return (
-      <Box>
-        <Text bold color="cyan">
-          {marker} {base}
-        </Text>
-        <Text color="cyan">{dir ? `  ${dir}` : ""}</Text>
-      </Box>
-    );
-  }
   return (
     <Box>
-      <Text dimColor>
-        {marker} {base}
-        {dir ? `  ${dir}` : ""}
+      <Text color={isSelected ? COLOR.primary : COLOR.info} bold={isSelected}>
+        {isSelected ? `${GLYPH.cur} ` : "  "}
       </Text>
+      <Text color={COLOR.primary} bold={isSelected}>
+        {base.padEnd(20)}
+      </Text>
+      {dir ? <Text dimColor>{`  ${dir}`}</Text> : null}
     </Box>
   );
 }

src/cli/ui/ChoiceConfirm.tsx

@@ -0,0 +1,75 @@
+/**
+ * Modal picker shown when the model calls `ask_choice`. Renders the
+ * question + 2–4 option rows (title + dimmed summary) + an optional
+ * "Let me type my own answer" escape hatch when `allowCustom` is true.
+ *
+ * The escape hatch matters because DeepSeek flash sometimes misframes
+ * the alternatives — none actually fit the user's intent. Without a
+ * bailout the user would have to cancel, type feedback, and wait for
+ * another round-trip. With it they just type and ship.
+ *
+ * Border color: magenta — deliberately distinct from cyan (plan),
+ * green (checkpoint), red (shell) so the user's eye learns the modes
+ * without reading headers.
+ */
+
+import { Box } from "ink";
+import React from "react";
+import type { ChoiceOption } from "../../tools/choice.js";
+import { ModalCard } from "./ModalCard.js";
+import { SingleSelect } from "./Select.js";
+
+export type ChoiceConfirmChoice =
+  | { kind: "pick"; optionId: string }
+  | { kind: "custom" }
+  | { kind: "cancel" };
+
+export interface ChoiceConfirmProps {
+  question: string;
+  options: ChoiceOption[];
+  allowCustom: boolean;
+  onChoose: (choice: ChoiceConfirmChoice) => void;
+}
+
+const CUSTOM_VALUE = "__custom__";
+const CANCEL_VALUE = "__cancel__";
+
+function ChoiceConfirmInner({ question, options, allowCustom, onChoose }: ChoiceConfirmProps) {
+  const items: Array<{ value: string; label: string; hint?: string }> = options.map((opt) => ({
+    value: opt.id,
+    label: `${opt.id} · ${opt.title}`,
+    hint: opt.summary,
+  }));
+  if (allowCustom) {
+    items.push({
+      value: CUSTOM_VALUE,
+      label: "Let me type my own answer",
+      hint: "None of the above fits — type a free-form reply. The model reads it verbatim.",
+    });
+  }
+  items.push({
+    value: CANCEL_VALUE,
+    label: "Cancel — drop the question",
+    hint: "Model stops and asks what you want instead.",
+  });
+
+  return (
+    <ModalCard accent="#f0abfc" icon="🔀" title="model wants you to pick" subtitle={question}>
+      <Box>
+        <SingleSelect
+          initialValue={options[0]?.id}
+          items={items}
+          onSubmit={(v) => {
+            if (v === CUSTOM_VALUE) onChoose({ kind: "custom" });
+            else if (v === CANCEL_VALUE) onChoose({ kind: "cancel" });
+            else onChoose({ kind: "pick", optionId: v });
+          }}
+          onCancel={() => onChoose({ kind: "cancel" })}
+          footer="[↑↓] navigate  ·  [Enter] select  ·  [Esc] cancel"
+        />
+      </Box>
+    </ModalCard>
+  );
+}
+
+export const ChoiceConfirm = React.memo(ChoiceConfirmInner);

src/cli/ui/ChromeBar.tsx

@@ -0,0 +1,259 @@
+import { Box, Text, useStdout } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for JSX compilation
+import React from "react";
+import stringWidth from "string-width";
+import type { SessionSummary } from "../../telemetry/stats.js";
+import { ChromeRule } from "./primitives.js";
+import { COLOR, GRADIENT } from "./theme.js";
+
+const COLD_START_TURNS = 3;
+const CACHE_BAR_CELLS = 10;
+
+export type Preset = "auto" | "flash" | "pro";
+
+export interface ChromeBarProps {
+  summary: SessionSummary;
+  rootDir?: string;
+  sessionName?: string | null;
+  preset?: Preset;
+  planMode?: boolean;
+  proArmed?: boolean;
+  escalated?: boolean;
+  updateAvailable?: string | null;
+  balance?: { currency: string; total: number } | null;
+  budgetUsd?: number | null;
+  /** Scroll progress: 0 = at latest, 1 = at oldest. Hides the pill at 0. */
+  scrollRatio?: number;
+}
+
+export function ChromeBar(props: ChromeBarProps): React.ReactElement {
+  const { stdout } = useStdout();
+  const cols = (stdout?.columns ?? 80) - 2; // subtract paddingX={1} on both sides
+  const cold = props.summary.turns <= COLD_START_TURNS;
+  const projectName = props.rootDir ? basename(props.rootDir) : null;
+  const mode = pickModePill(props.planMode, props.preset);
+  const proPill = props.escalated
+    ? { label: "⇧ pro", color: COLOR.err }
+    : props.proArmed
+      ? { label: "⇧ pro", color: COLOR.warn }
+      : null;
+
+  // Greedy width-aware fit. Layout (each gap is exactly ONE space — single
+  // suffix on update/mode/pro/scroll, single prefix on balance/cache):
+  //   [brand][·project][›session]<spacer>[scroll][update][mode][pro]$cost  w bal cache █▓▓▓
+  // Always-shown carve out the budget first; optional pieces are dropped
+  // by priority — balance > cache > session > update — until the row fits.
+  // (`flexGrow` spacer can shrink to 0, so no minimum reserve.) Cache is
+  // shown unconditionally now: pre-turn-4 it renders dim with a "—" so
+  // it's "default on" instead of materializing only after a few turns.
+  const SEP = 3; // " · " / " › "
+  const GAP = 1;
+  const scrollLabel =
+    props.scrollRatio !== undefined && props.scrollRatio > 0
+      ? `[↑ ${Math.round(props.scrollRatio * 100)}%]`
+      : "";
+  const updateLabel = props.updateAvailable ? `↑ ${props.updateAvailable}` : "";
+  const balanceLabel = props.balance ? formatBalanceLabel(props.balance) : "";
+  const cachePct = Math.round(props.summary.cacheHitRatio * 100);
+  // Use the worst-case rendered cache string (3-digit pct, full bar) so the
+  // shed decision doesn't oscillate as the percentage changes turn-to-turn.
+  const cacheLabel = `cache ${"█".repeat(CACHE_BAR_CELLS)} 100%`;
+  const costLabel = `$${props.summary.totalCostUsd.toFixed(4)}${
+    props.budgetUsd && props.budgetUsd > 0 ? ` / $${props.budgetUsd.toFixed(2)}` : ""
+  }`;
+
+  const brandW = stringWidth("◈ reasonix");
+  const projectW = projectName ? SEP + stringWidth(projectName) : 0;
+  const fixedLeft = brandW + projectW;
+  const scrollW = scrollLabel ? stringWidth(scrollLabel) + GAP : 0;
+  const modeW = mode ? stringWidth(`[${mode.label}]`) + GAP : 0;
+  const proW = proPill ? stringWidth(`[${proPill.label}]`) + GAP : 0;
+  const costW = stringWidth(costLabel);
+  const fixedRight = scrollW + modeW + proW + costW;
+  let budget = cols - fixedLeft - fixedRight;
+
+  const balanceOptW = balanceLabel ? GAP + stringWidth(balanceLabel) : 0;
+  const cacheOptW = GAP + stringWidth(cacheLabel);
+  const sessionOptW = props.sessionName ? SEP + stringWidth(props.sessionName) : 0;
+  const updateOptW = updateLabel ? stringWidth(updateLabel) + GAP : 0;
+
+  const showBalance = balanceOptW > 0 && budget >= balanceOptW;
+  if (showBalance) budget -= balanceOptW;
+  const showCache = budget >= cacheOptW;
+  if (showCache) budget -= cacheOptW;
+  const showSession = sessionOptW > 0 && budget >= sessionOptW;
+  if (showSession) budget -= sessionOptW;
+  const showUpdate = updateOptW > 0 && budget >= updateOptW;
+  if (showUpdate) budget -= updateOptW;
+
+  return (
+    <Box flexDirection="column" paddingX={1}>
+      <Box>
+        <Text bold color={GRADIENT[0]}>
+          {"◈ "}
+        </Text>
+        <Text color={COLOR.brand} bold>
+          reasonix
+        </Text>
+        {projectName ? (
+          <>
+            <Text color={COLOR.info} dimColor>
+              {" · "}
+            </Text>
+            <Text>{projectName}</Text>
+            {showSession && props.sessionName ? (
+              <>
+                <Text color={COLOR.info} dimColor>
+                  {" › "}
+                </Text>
+                <Text color={COLOR.info}>{props.sessionName}</Text>
+              </>
+            ) : null}
+          </>
+        ) : null}
+
+        <Box flexGrow={1} />
+
+        {scrollLabel ? (
+          <>
+            <Text color={COLOR.accent} bold>
+              {scrollLabel}
+            </Text>
+            <Text> </Text>
+          </>
+        ) : null}
+        {showUpdate ? (
+          <>
+            <Text color={COLOR.warn} bold>
+              {updateLabel}
+            </Text>
+            <Text> </Text>
+          </>
+        ) : null}
+        {mode ? (
+          <>
+            <Text color={mode.color} bold>
+              {`[${mode.label}]`}
+            </Text>
+            <Text> </Text>
+          </>
+        ) : null}
+        {proPill ? (
+          <>
+            <Text color={proPill.color} bold>
+              {`[${proPill.label}]`}
+            </Text>
+            <Text> </Text>
+          </>
+        ) : null}
+        <CostPill summary={props.summary} cold={cold} budgetUsd={props.budgetUsd} />
+        {showBalance && props.balance ? (
+          <>
+            <Text> </Text>
+            <BalancePill balance={props.balance} />
+          </>
+        ) : null}
+        {showCache ? (
+          <>
+            <Text> </Text>
+            <CachePill ratio={props.summary.cacheHitRatio} cold={cold} pct={cachePct} />
+          </>
+        ) : null}
+      </Box>
+      <ChromeRule />
+    </Box>
+  );
+}
+
+function formatBalanceLabel(balance: { currency: string; total: number }): string {
+  const sym = balance.currency === "USD" ? "$" : balance.currency === "CNY" ? "¥" : "";
+  const suf = sym ? "" : ` ${balance.currency}`;
+  return `w ${sym}${balance.total.toFixed(2)}${suf}`;
+}
+
+function CostPill({
+  summary,
+  cold,
+  budgetUsd,
+}: {
+  summary: SessionSummary;
+  cold: boolean;
+  budgetUsd?: number | null;
+}): React.ReactElement {
+  const cost = summary.totalCostUsd;
+  const color = cold ? COLOR.info : sessionCostColor(cost);
+  return (
+    <>
+      <Text color={color} bold={!cold} dimColor={cold}>
+        {`$${cost.toFixed(4)}`}
+      </Text>
+      {budgetUsd && budgetUsd > 0 ? (
+        <Text color={COLOR.info} dimColor>
+          {` / $${budgetUsd.toFixed(2)}`}
+        </Text>
+      ) : null}
+    </>
+  );
+}
+
+function BalancePill({
+  balance,
+}: {
+  balance: { currency: string; total: number };
+}): React.ReactElement {
+  const { total } = balance;
+  const color = total < 1 ? COLOR.err : total < 5 ? COLOR.warn : COLOR.ok;
+  return <Text color={color}>{formatBalanceLabel(balance)}</Text>;
+}
+
+function CachePill({
+  ratio,
+  cold,
+  pct,
+}: {
+  ratio: number;
+  cold: boolean;
+  pct: number;
+}): React.ReactElement {
+  const color = ratio >= 0.7 ? COLOR.ok : ratio >= 0.4 ? COLOR.warn : COLOR.err;
+  const filled = Math.max(0, Math.min(CACHE_BAR_CELLS, Math.round(ratio * CACHE_BAR_CELLS)));
+  const empty = CACHE_BAR_CELLS - filled;
+  return (
+    <>
+      <Text color={COLOR.info} dimColor>
+        {"cache "}
+      </Text>
+      <Text color={cold ? COLOR.info : color} dimColor={cold}>
+        {"█".repeat(filled)}
+      </Text>
+      <Text dimColor>{"░".repeat(empty)}</Text>
+      <Text color={cold ? undefined : color} bold={!cold} dimColor={cold}>
+        {cold && pct === 0 ? " —" : ` ${pct}%`}
+      </Text>
+    </>
+  );
+}
+
+function pickModePill(
+  planMode: boolean | undefined,
+  preset: Preset | undefined,
+): { label: string; color: string } | null {
+  if (planMode) return { label: "PLAN", color: COLOR.err };
+  if (!preset) return null;
+  if (preset === "pro") return { label: "pro", color: COLOR.accent };
+  if (preset === "flash") return { label: "flash", color: COLOR.info };
+  return { label: "auto", color: COLOR.primary };
+}
+
+function sessionCostColor(cost: number): string | undefined {
+  if (cost <= 0) return undefined;
+  if (cost >= 5) return COLOR.err;
+  if (cost >= 0.5) return COLOR.warn;
+  return COLOR.ok;
+}
+
+function basename(path: string): string {
+  const norm = path.replace(/\\/g, "/");
+  const i = norm.lastIndexOf("/");
+  return i === -1 ? norm : norm.slice(i + 1);
+}

src/cli/ui/CtxFooter.tsx

@@ -0,0 +1,88 @@
+import { Box, Text, useStdout } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for JSX compilation
+import React, { useMemo } from "react";
+import stringWidth from "string-width";
+import type { CacheFirstLoop } from "../../loop.js";
+import type { SessionSummary } from "../../telemetry/stats.js";
+import { computeCtxBreakdown } from "./ctx-breakdown.js";
+import { Bar, ChromeRule, formatTokens } from "./primitives.js";
+import { COLOR } from "./theme.js";
+
+interface CtxFooterProps {
+  loop: CacheFirstLoop;
+  summary: SessionSummary;
+}
+
+const BAR_CELLS = 14;
+
+export function CtxFooter({ loop, summary }: CtxFooterProps): React.ReactElement {
+  // Memoize on turn boundary. `summary.turns` is a freshness key — its
+  // change forces recomputation when the loop's log appends a new turn.
+  // biome-ignore lint/correctness/useExhaustiveDependencies: summary.turns is a freshness key, not a value used in the body
+  const data = useMemo(() => computeCtxBreakdown(loop), [loop, summary.turns]);
+  const { stdout } = useStdout();
+  const cols = (stdout?.columns ?? 80) - 2;
+
+  const total = data.systemTokens + data.toolsTokens + data.logTokens + data.inputTokens;
+  const ratio = data.ctxMax > 0 ? Math.min(1, total / data.ctxMax) : 0;
+  const pct = Math.round(ratio * 100);
+  const severity = pct >= 80 ? COLOR.err : pct >= 60 ? COLOR.warn : COLOR.ok;
+
+  // Always-shown core: label + bar + total + pct + (compact warn when severe)
+  const labelStr = "  ctx  ";
+  const totalStr = `${formatTokens(total)}/${formatTokens(data.ctxMax)}`;
+  const pctStr = ` · ${pct}%`;
+  const warnStr = pct >= 80 ? "  ·  /compact" : "";
+  const fixedW =
+    stringWidth(labelStr) +
+    BAR_CELLS +
+    1 + // space after bar
+    stringWidth(totalStr) +
+    stringWidth(pctStr) +
+    stringWidth(warnStr);
+
+  // Optional breakdown segments. Greedy fit by priority (drop first → drop last):
+  //   input → log → tools → sys. Sys comes off the line LAST because it's
+  //   the most stable number; users learn its size and read other segments
+  //   relative to it.
+  let budget = cols - fixedW;
+  const sysSeg = `  ·  sys ${formatTokens(data.systemTokens)}`;
+  const toolsSeg = `  ·  tools ${formatTokens(data.toolsTokens)}`;
+  const logSeg = `  ·  log ${formatTokens(data.logTokens)}`;
+  const inputSeg = data.inputTokens > 0 ? `  ·  input ${formatTokens(data.inputTokens)}` : "";
+
+  const showSys = budget >= stringWidth(sysSeg);
+  if (showSys) budget -= stringWidth(sysSeg);
+  const showTools = budget >= stringWidth(toolsSeg);
+  if (showTools) budget -= stringWidth(toolsSeg);
+  const showLog = budget >= stringWidth(logSeg);
+  if (showLog) budget -= stringWidth(logSeg);
+  const showInput = inputSeg !== "" && budget >= stringWidth(inputSeg);
+  if (showInput) budget -= stringWidth(inputSeg);
+
+  return (
+    <Box flexDirection="column" paddingX={1}>
+      <ChromeRule />
+      <Text>
+        <Text color={COLOR.info} dimColor>
+          {labelStr}
+        </Text>
+        <Bar ratio={ratio} color={severity} cells={BAR_CELLS} />
+        <Text> </Text>
+        <Text color={severity} bold>
+          {totalStr}
+        </Text>
+        <Text dimColor>{pctStr}</Text>
+        {showSys ? <Text dimColor>{sysSeg}</Text> : null}
+        {showTools ? <Text dimColor>{toolsSeg}</Text> : null}
+        {showLog ? <Text dimColor>{logSeg}</Text> : null}
+        {showInput ? <Text dimColor>{inputSeg}</Text> : null}
+        {warnStr ? (
+          <Text color={COLOR.err} bold>
+            {warnStr}
+          </Text>
+        ) : null}
+      </Text>
+    </Box>
+  );
+}

src/cli/ui/DenyContextInput.tsx

@@ -0,0 +1,66 @@
+/** Single-line text input for deny-with-reason — uses our KeystrokeContext, not ink-text-input. */
+
+import { Box, Text } from "ink";
+import React, { useState } from "react";
+import { useKeystroke } from "./keystroke-context.js";
+
+export interface DenyContextInputProps {
+  label?: string;
+  onSubmit: (context: string) => void;
+  onCancel: () => void;
+}
+
+export function DenyContextInput({
+  label = "Reason for denying:",
+  onSubmit,
+  onCancel,
+}: DenyContextInputProps) {
+  const [value, setValue] = useState("");
+
+  useKeystroke((ev) => {
+    if (ev.paste) {
+      setValue((v) => v + ev.input);
+      return;
+    }
+    if (ev.escape) {
+      onCancel();
+      return;
+    }
+    if (ev.return) {
+      onSubmit(value);
+      return;
+    }
+    if (ev.backspace) {
+      setValue((v) => v.slice(0, -1));
+      return;
+    }
+    if (ev.input && !ev.tab && !ev.upArrow && !ev.downArrow && !ev.leftArrow && !ev.rightArrow) {
+      setValue((v) => v + ev.input);
+    }
+  });
+
+  return (
+    <Box flexDirection="column">
+      <Box>
+        <Text dimColor>{label} </Text>
+        <Text>{value}</Text>
+        <Text backgroundColor="#67e8f9" color="black">
+          {" "}
+        </Text>
+      </Box>
+      <Box marginTop={1}>
+        <Text dimColor>
+          {"["}
+          <Text color="#67e8f9" bold>
+            Enter
+          </Text>
+          {"] confirm  ·  ["}
+          <Text color="#67e8f9" bold>
+            Esc
+          </Text>
+          {"] cancel"}
+        </Text>
+      </Box>
+    </Box>
+  );
+}

src/cli/ui/DiffApp.tsx

@@ -16,7 +16,7 @@ import {
   type TurnPair,
   findNextDivergence,
   findPrevDivergence,
-} from "../../diff.js";
+} from "../../transcript/diff.js";
 import { RecordView } from "./RecordView.js";
 
 export interface DiffAppProps {

src/cli/ui/EditConfirm.tsx

@@ -0,0 +1,228 @@
+import { Box, Text, useStdout } from "ink";
+import React, { useMemo, useState } from "react";
+import { formatEditBlockSplit } from "../../code/diff-preview.js";
+import type { EditBlock } from "../../code/edit-blocks.js";
+import { DenyContextInput } from "./DenyContextInput.js";
+import { ModalCard } from "./ModalCard.js";
+import { SplitDiff } from "./SplitDiff.js";
+import { useKeystroke } from "./keystroke-context.js";
+
+/**
+ * Choice surfaced to the interceptor when the user resolves the modal:
+ *   - `apply`                → apply this edit, keep prompting on next.
+ *   - `reject`               → tell the model the user refused; do NOT
+ *                              retry the same edit.
+ *   - `apply-rest-of-turn`   → apply this edit AND every remaining edit
+ *                              this turn without further prompts. Resets
+ *                              at the next user turn.
+ *   - `flip-to-auto`         → apply this edit + persistently switch the
+ *                              session to AUTO mode (survives restart).
+ */
+export type EditReviewChoice = "apply" | "reject" | "apply-rest-of-turn" | "flip-to-auto";
+
+export interface EditConfirmProps {
+  block: EditBlock;
+  onChoose: (choice: EditReviewChoice, denyContext?: string) => void;
+}
+
+/**
+ * Overhead reserved for non-diff UI inside the modal: border (2),
+ * title (1), separator (1), file-header (1), scroll-indicator rows
+ * (up to 2), footer + margin (3), plus breathing room for the host
+ * TUI's chrome above (stats panel ≈ 4, historical live rows, prompt
+ * input ≈ 2). 18 rows absorbed before the diff gets any budget.
+ */
+const MODAL_OVERHEAD_ROWS = 18;
+
+/**
+ * Absolute floor on the diff viewport. If the terminal is absurdly
+ * short (< 26 rows total) we still show at least 8 diff lines so the
+ * modal is usable; the user scrolls more aggressively but can't end up
+ * with a zero-height viewport.
+ */
+const MIN_DIFF_ROWS = 8;
+
+/**
+ * Modal-style approval for a single model-proposed file edit.
+ *
+ * Why per-edit instead of end-of-turn batch: users reported they can't
+ * tell if the model is about to make one small change or seven sprawling
+ * ones until the turn is over. Per-edit prompts let the user intervene
+ * early — reject a bad direction before the model builds on it, or
+ * approve the first few and hit `a` to let the rest land.
+ *
+ * Diff viewport: we compute the UNCAPPED diff once, then slice to a
+ * height budget derived from terminal rows. Large diffs (100+ lines)
+ * are scrollable via j/k/↑/↓/Space/PgUp/PgDn/g/G — the user can page
+ * through the whole change before deciding, and the action footer
+ * never scrolls off the bottom. Before the scroll support a 97-line
+ * scene.ts diff truncated at "… 67 more …" which was unreviewable.
+ */
+export function EditConfirm({ block, onChoose }: EditConfirmProps) {
+  const { stdout } = useStdout();
+  const rows = stdout?.rows ?? 40;
+  const budget = Math.max(MIN_DIFF_ROWS, rows - MODAL_OVERHEAD_ROWS);
+
+  // Side-by-side rows — maxLines pushed high so the split renderer
+  // never inserts its own truncation marker; we slice + scroll here.
+  // contextLines: 2 keeps the trim tight on each end.
+  const allRows = useMemo(
+    () => formatEditBlockSplit(block, { contextLines: 2, maxLines: 100_000 }),
+    [block],
+  );
+
+  const [scroll, setScroll] = useState(0);
+  const maxScroll = Math.max(0, allRows.length - budget);
+  // Clamp scroll if budget shrinks (terminal resized) after a previous
+  // keypress drove the offset past the new ceiling.
+  const effectiveScroll = Math.min(scroll, maxScroll);
+
+  const [phase, setPhase] = useState<"review" | "context">("review");
+
+  useKeystroke((ev) => {
+    if (ev.paste) return;
+    if (phase === "context") return;
+
+    const input = ev.input;
+    const key = ev;
+    // Action keys first — decision wins over scroll so a user who
+    // hammered PgDn can still hit `y` at the end without a stray
+    // extra scroll.
+    if (key.return || input === "y") {
+      onChoose("apply");
+      return;
+    }
+    if (input === "n") {
+      setPhase("context");
+      return;
+    }
+    if (input === "a") {
+      onChoose("apply-rest-of-turn");
+      return;
+    }
+    if (input === "A") {
+      onChoose("flip-to-auto");
+      return;
+    }
+    // Scroll navigation — vim-ish (j/k) and emacs-ish (arrows) both
+    // work. Space for "next page" is the pager convention.
+    if (key.downArrow || input === "j") {
+      setScroll((s) => Math.min(maxScroll, s + 1));
+      return;
+    }
+    if (key.upArrow || input === "k") {
+      setScroll((s) => Math.max(0, s - 1));
+      return;
+    }
+    if (key.pageDown || input === " " || input === "f") {
+      setScroll((s) => Math.min(maxScroll, s + Math.max(1, budget - 2)));
+      return;
+    }
+    if (key.pageUp || input === "b") {
+      setScroll((s) => Math.max(0, s - Math.max(1, budget - 2)));
+      return;
+    }
+    if (input === "g") {
+      setScroll(0);
+      return;
+    }
+    if (input === "G") {
+      setScroll(maxScroll);
+      return;
+    }
+    // Esc falls through to the parent abort handler.
+  });
+
+  const isNew = block.search === "";
+  const removed = isNew ? 0 : (block.search.match(/\n/g)?.length ?? 0) + 1;
+  const added = block.replace === "" ? 0 : (block.replace.match(/\n/g)?.length ?? 0) + 1;
+  const tag = isNew ? "NEW" : "EDIT";
+
+  const visibleRows = allRows.slice(effectiveScroll, effectiveScroll + budget);
+  const hiddenAbove = effectiveScroll;
+  const hiddenBelow = Math.max(0, allRows.length - effectiveScroll - budget);
+  const totalLines = allRows.length;
+  const showScrollHud = hiddenAbove + hiddenBelow > 0;
+
+  const subtitleParts = [`-${removed} +${added} lines`];
+  if (showScrollHud) {
+    subtitleParts.push(
+      `viewing ${effectiveScroll + 1}-${effectiveScroll + visibleRows.length}/${totalLines}`,
+    );
+  }
+
+  if (phase === "context") {
+    return (
+      <ModalCard
+        accent={isNew ? "#86efac" : "#fcd34d"}
+        icon={isNew ? "✚" : "✎"}
+        title={`${tag}  ${block.path}`}
+        subtitle="rejecting — add context (optional)"
+      >
+        <DenyContextInput
+          label="Reason for rejecting (or Enter to reject without context): "
+          onSubmit={(context) => onChoose("reject", context)}
+          onCancel={() => setPhase("review")}
+        />
+      </ModalCard>
+    );
+  }
+
+  return (
+    <ModalCard
+      accent={isNew ? "#86efac" : "#fcd34d"}
+      icon={isNew ? "✚" : "✎"}
+      title={`${tag}  ${block.path}`}
+      subtitle={subtitleParts.join("  ·  ")}
+    >
+      {hiddenAbove > 0 ? (
+        <Text
+          dimColor
+        >{`  ↑ ${hiddenAbove} line${hiddenAbove === 1 ? "" : "s"} above  (↑/k or PgUp)`}</Text>
+      ) : null}
+      <SplitDiff rows={visibleRows} />
+      <Box>
+        <Text color="#fbc8c8" backgroundColor="#2a1212">
+          {"  - old  "}
+        </Text>
+        <Text>{"  "}</Text>
+        <Text color="#bef0c8" backgroundColor="#0c2718">
+          {"  + new  "}
+        </Text>
+        <Text dimColor>
+          {"   side-by-side · removed lines on the left, added on the right · paired by offset"}
+        </Text>
+      </Box>
+      {hiddenBelow > 0 ? (
+        <Text
+          dimColor
+        >{`  ↓ ${hiddenBelow} line${hiddenBelow === 1 ? "" : "s"} below  (↓/j or Space/PgDn)`}</Text>
+      ) : null}
+      <Box marginTop={1}>
+        <Text dimColor>
+          {"["}
+          <Text color="#67e8f9" bold>
+            y
+          </Text>
+          {"/Enter] apply  ·  ["}
+          <Text color="#67e8f9" bold>
+            n
+          </Text>
+          {"] reject with reason  ·  ["}
+          <Text color="#67e8f9" bold>
+            a
+          </Text>
+          {"] apply rest  ·  ["}
+          <Text color="#67e8f9" bold>
+            A
+          </Text>
+          {"] flip AUTO  ·  ["}
+          <Text color="#67e8f9" bold>
+            ↑↓/Space
+          </Text>
+          {"] scroll  ·  [Esc] abort"}
+        </Text>
+      </Box>
+    </ModalCard>
+  );
+}

src/cli/ui/LiveRows.tsx

@@ -0,0 +1,360 @@
+import { Box, Text, useStdout } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React as a runtime value (classic transform)
+import React from "react";
+import type { ApplyResult } from "../../code/edit-blocks.js";
+import type { EditMode } from "../../config.js";
+import type { JobRegistry } from "../../tools/jobs.js";
+import { CharBar } from "./char-bar.js";
+import { useElapsedSeconds, useSlowTick, useTick } from "./ticker.js";
+
+export const SPINNER_FRAMES = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"];
+
+/**
+ * Transient "what's happening now" row shown during silent phases
+ * between the primary events — harvest round-trip, R1 thinking
+ * about a tool result before the next streaming delta, forced
+ * summary. Matches OngoingToolRow's visual language (braille
+ * spinner + elapsed seconds) so the user's eyes track the same
+ * spot regardless of which kind of wait it is.
+ */
+export function StatusRow({ text }: { text: string }) {
+  const tick = useTick();
+  const elapsed = useElapsedSeconds();
+  return (
+    <Box marginY={1} paddingX={1}>
+      <Text color="#c4b5fd" bold>
+        {SPINNER_FRAMES[tick % SPINNER_FRAMES.length]}
+      </Text>
+      <Text>{"  "}</Text>
+      <Text color="#c4b5fd">{text}</Text>
+      <Text dimColor>{`  ·  ${elapsed}s`}</Text>
+    </Box>
+  );
+}
+
+/**
+ * One-line bottom status bar showing the current edit mode, pending
+ * queue size (review only), an undo hint (auto only / after /apply),
+ * and the Shift+Tab nudge. Rendered immediately above PromptInput so
+ * the mode is always in peripheral vision when the user's eyes are at
+ * the prompt. Flashes briefly on mode change so Shift+Tab gives a
+ * visible acknowledgment without the user having to scan the header.
+ *
+ * The plan-mode pill takes precedence — when plan mode is on, writes
+ * are bounced regardless of edit mode, so surfacing it is more useful
+ * than the review/auto toggle.
+ */
+export function ModeStatusBar({
+  editMode,
+  pendingCount,
+  flash,
+  planMode,
+  undoArmed,
+  jobs,
+}: {
+  editMode: EditMode;
+  pendingCount: number;
+  flash: boolean;
+  planMode: boolean;
+  undoArmed: boolean;
+  jobs?: JobRegistry;
+}) {
+  // Subscribe to the slow tick so the jobs count stays live — the
+  // registry is mutated outside React, so we need a periodic repaint
+  // to catch it. 1Hz is enough for a count badge: a 1s lag for a job
+  // appearing/disappearing is imperceptible vs how long jobs run.
+  // No-op when there's no registry (chat mode / tests).
+  useSlowTick();
+  const running = jobs?.runningCount() ?? 0;
+  const jobsTag =
+    running > 0 ? (
+      <Text color="yellow" bold>{`  ·  ⏵ ${running} job${running === 1 ? "" : "s"}`}</Text>
+    ) : null;
+  // The same mode pill is already in the StatsPanel header — here we
+  // skip the pill and keep just a tight inline hint right above the
+  // input so the user has the actionable bit (what y/n/u/Shift+Tab
+  // do) without the whole tutorial.
+  if (planMode) {
+    return (
+      <ModeBarFrame>
+        <ModePill label="PLAN MODE" bg="red" flash={flash} />
+        <Text dimColor>{"   writes gated · /plan off to leave"}</Text>
+        {jobsTag}
+      </ModeBarFrame>
+    );
+  }
+  const label = editMode === "yolo" ? "YOLO" : editMode === "auto" ? "AUTO" : "REVIEW";
+  const bg = editMode === "yolo" ? "red" : editMode === "auto" ? "magenta" : "cyan";
+  const mid =
+    editMode === "yolo"
+      ? "edits + shell auto · /undo to roll back"
+      : editMode === "auto"
+        ? "edits land now · u to undo"
+        : pendingCount > 0
+          ? `${pendingCount} queued · y apply · n discard`
+          : "edits queued · y apply · n discard";
+  return (
+    <ModeBarFrame>
+      <ModePill label={label} bg={bg} flash={flash} />
+      <Text dimColor>{`   ${mid} · Shift+Tab to flip`}</Text>
+      {jobsTag}
+    </ModeBarFrame>
+  );
+}
+
+/**
+ * Wraps the bottom mode/jobs row in a dim top rule + side padding
+ * so the modeline reads as its own zone, separate from the prompt
+ * input above. Keeps the live region border-free (the rule is a
+ * single Text row, not a bordered Box) so Ink's eraseLines miscount
+ * stays out of it.
+ */
+function ModeBarFrame({ children }: { children: React.ReactNode }) {
+  const { stdout } = useStdout();
+  const cols = stdout?.columns ?? 80;
+  const ruleWidth = Math.max(20, cols - 2);
+  return (
+    <Box flexDirection="column">
+      <Box paddingX={1}>
+        <Text color="#475569" dimColor>
+          {"╌".repeat(ruleWidth)}
+        </Text>
+      </Box>
+      <Box paddingX={1}>{children}</Box>
+    </Box>
+  );
+}
+
+/**
+ * Solid-background mode badge so the bottom status bar reads at a
+ * glance — bracket-text style matching the StatsPanel chrome at top
+ * (one canonical pill style across the whole TUI). `flash` inverts
+ * briefly after a mode flip so the user sees "yes, it changed"; once
+ * the flash fades it returns to its quiet bracket form.
+ *
+ * Why bracket and not solid bg: the mode is already shown in the top
+ * chrome's pill. Repeating the same info as a loud, padded block
+ * directly above the prompt was visual repetition, not reinforcement.
+ * Bracket here keeps the actionable hint readable while the flash
+ * still does its acknowledgement job.
+ */
+function ModePill({
+  label,
+  bg,
+  flash,
+}: {
+  label: string;
+  bg: "magenta" | "cyan" | "red";
+  flash: boolean;
+}) {
+  return (
+    <Text color={bg} bold inverse={flash}>
+      {`[${label}]`}
+    </Text>
+  );
+}
+
+/**
+ * "Just auto-applied N edits — press u to undo" banner. Rendered below
+ * the live rows after an auto-mode edit batch lands, visible for 5s.
+ * The countdown ticks once per second — slow tick is the right
+ * cadence here (faster re-renders just redraw the same digit).
+ * State cleanup (the banner disappearing) happens in the parent's
+ * setTimeout — the component is purely display.
+ */
+export function UndoBanner({
+  banner,
+}: {
+  banner: { results: ApplyResult[]; expiresAt: number };
+}) {
+  // Fast tick so the char bar shrinks one cell at a time rather than
+  // jumping in 1s gulps. With FAST_TICK_MS=120 we get ~42 frames over
+  // a 5s window — smooth enough that the bar reads as a continuous
+  // countdown without looking like a stutter.
+  useTick();
+  const totalMs = 5000; // mirrors armUndoBanner's hard-coded window
+  const remainingMs = Math.max(0, banner.expiresAt - Date.now());
+  const remainingSec = Math.ceil(remainingMs / 1000);
+  const ok = banner.results.filter((r) => r.status === "applied" || r.status === "created").length;
+  const total = banner.results.length;
+  const urgent = remainingSec <= 1;
+  // 20-cell bar, 4 cells per second. Filled = remaining time.
+  const pct = (remainingMs / totalMs) * 100;
+  return (
+    <Box marginY={1} paddingX={1}>
+      <Text backgroundColor="#c4b5fd" color="black" bold>
+        {` ✓ AUTO-APPLIED ${ok}/${total} `}
+      </Text>
+      <Text dimColor>{"   press "}</Text>
+      <Text backgroundColor="#67e8f9" color="black" bold>
+        {" u "}
+      </Text>
+      <Text dimColor>{" to undo  "}</Text>
+      <CharBar pct={pct} width={20} color={urgent ? "#f87171" : "#c4b5fd"} showLabel={false} />
+      <Text dimColor>{"  "}</Text>
+      <Text color={urgent ? "#f87171" : "#c4b5fd"} bold={urgent}>
+        {`${remainingSec}s`}
+      </Text>
+    </Box>
+  );
+}
+
+/**
+ * Live one-line indicator for a running subagent. Sits below the
+ * OngoingToolRow (the parent's tool dispatch row for `spawn_subagent`)
+ * so the user sees both layers at once: outer "spawn_subagent
+ * running…" + inner "⌬ subagent: <task> · iter N · 12.3s". Cleared
+ * when the subagent ends; a one-line summary lands in historical.
+ */
+export function SubagentRow({
+  activity,
+}: {
+  activity: { task: string; iter: number; elapsedMs: number };
+}) {
+  const tick = useTick();
+  const seconds = (activity.elapsedMs / 1000).toFixed(1);
+  // Bracket-text style — same vocabulary as the static ToolPill so a
+  // turn that contains both finished tools and a live subagent reads
+  // as a consistent column. The braille spinner + colored ⌬ + colored
+  // name carry enough weight without a solid-bg block.
+  return (
+    <Box paddingLeft={3}>
+      <Text color="#c4b5fd" bold>
+        {SPINNER_FRAMES[tick % SPINNER_FRAMES.length]}
+      </Text>
+      <Text>{"  "}</Text>
+      <Text color="#c4b5fd" bold>
+        ⌬ subagent
+      </Text>
+      <Text color="#c4b5fd">{`  ${activity.task}`}</Text>
+      <Text dimColor>{`   iter ${activity.iter}  ·  ${seconds}s`}</Text>
+    </Box>
+  );
+}
+
+/**
+ * Live spinner row while a tool call is in flight. Without this the
+ * window between the model's `tool_calls` decision and the tool's
+ * result (often seconds for a multi-KB `filesystem_edit_file`) looks
+ * like the app has frozen — the streaming assistant display is
+ * already cleared and the input is disabled, so there's nothing to
+ * look at.
+ *
+ * Shows three signals: a braille spinner (liveness), an elapsed
+ * timer in seconds (so "long" has a number attached), and a
+ * per-tool summary of the most informative argument fields (path,
+ * edits count, pattern, etc.). As of 0.4.8, MCP progress frames
+ * (`notifications/progress`) land here too — bar + "n/N" when the
+ * server reports a total, free-form message when not.
+ */
+export function OngoingToolRow({
+  tool,
+  progress,
+}: {
+  tool: { name: string; args?: string };
+  progress: { progress: number; total?: number; message?: string } | null;
+}) {
+  const tick = useTick();
+  const elapsed = useElapsedSeconds();
+  const summary = summarizeToolArgs(tool.name, tool.args);
+  // Bracket-text style — matches the static ToolPill that lands once
+  // the call resolves, so a row of in-flight + finished tools reads
+  // as one continuous column instead of two visual languages.
+  return (
+    <Box marginY={1} flexDirection="column" paddingX={1}>
+      <Box>
+        <Text color="#fcd34d" bold>
+          {SPINNER_FRAMES[tick % SPINNER_FRAMES.length]}
+        </Text>
+        <Text>{"  "}</Text>
+        <Text color="#fcd34d" bold>
+          {`▣ ${tool.name}`}
+        </Text>
+        <Text dimColor>{`  running · ${elapsed}s`}</Text>
+      </Box>
+      {progress ? (
+        <Box paddingLeft={3}>
+          <Text color="#67e8f9">{renderProgressLine(progress)}</Text>
+        </Box>
+      ) : null}
+      {summary ? (
+        <Box paddingLeft={3}>
+          <Text dimColor>{summary}</Text>
+        </Box>
+      ) : null}
+    </Box>
+  );
+}
+
+/**
+ * Render an MCP progress frame as a single line. When the server
+ * reports `total`, show an ASCII progress bar + "n/total pct%";
+ * otherwise just "progress" + optional message. Width is modest
+ * so the line fits even in a narrow terminal.
+ */
+function renderProgressLine(p: { progress: number; total?: number; message?: string }): string {
+  const msg = p.message ? `  ${p.message}` : "";
+  if (p.total && p.total > 0) {
+    const ratio = Math.max(0, Math.min(1, p.progress / p.total));
+    const width = 20;
+    const filled = Math.round(ratio * width);
+    const bar = "█".repeat(filled) + "░".repeat(width - filled);
+    const pct = (ratio * 100).toFixed(0);
+    return `[${bar}] ${p.progress}/${p.total} ${pct}%${msg}`;
+  }
+  return `progress: ${p.progress}${msg}`;
+}
+
+/**
+ * Turn raw JSON tool arguments into a one-line human summary. For
+ * common filesystem MCP tools we pull the actually-useful fields; for
+ * anything else we fall back to a truncated raw string so the user
+ * still sees *something* beyond the tool name.
+ *
+ * Match on suffix (e.g. `_read_file`) rather than exact name because
+ * `bridgeMcpTools({ namePrefix: "filesystem_" })` prepends the server
+ * namespace — tools arrive as `filesystem_read_file` in practice but
+ * callers might wire up anonymous too.
+ */
+function summarizeToolArgs(name: string, args?: string): string {
+  if (!args || args === "{}") return "";
+  let parsed: Record<string, unknown>;
+  try {
+    parsed = JSON.parse(args) as Record<string, unknown>;
+  } catch {
+    // Unparseable JSON — show a head slice so user at least sees
+    // what the model tried.
+    return args.length > 80 ? `${args.slice(0, 80)}…` : args;
+  }
+  const hasSuffix = (s: string) => name === s || name.endsWith(`_${s}`);
+  const path = typeof parsed.path === "string" ? parsed.path : undefined;
+  if (hasSuffix("read_file")) {
+    const head = typeof parsed.head === "number" ? `, head=${parsed.head}` : "";
+    const tail = typeof parsed.tail === "number" ? `, tail=${parsed.tail}` : "";
+    return `path: ${path ?? "?"}${head}${tail}`;
+  }
+  if (hasSuffix("write_file")) {
+    const content = typeof parsed.content === "string" ? parsed.content : "";
+    return `path: ${path ?? "?"} (${content.length} chars)`;
+  }
+  if (hasSuffix("edit_file")) {
+    const edits = Array.isArray(parsed.edits) ? parsed.edits.length : 0;
+    return `path: ${path ?? "?"} (${edits} edit${edits === 1 ? "" : "s"})`;
+  }
+  if (hasSuffix("list_directory") || hasSuffix("directory_tree")) {
+    return `path: ${path ?? "?"}`;
+  }
+  if (hasSuffix("search_files")) {
+    const pattern = typeof parsed.pattern === "string" ? parsed.pattern : "?";
+    return `path: ${path ?? "?"} · pattern: ${pattern}`;
+  }
+  if (hasSuffix("move_file")) {
+    const src = typeof parsed.source === "string" ? parsed.source : "?";
+    const dst = typeof parsed.destination === "string" ? parsed.destination : "?";
+    return `${src} → ${dst}`;
+  }
+  if (hasSuffix("get_file_info")) {
+    return `path: ${path ?? "?"}`;
+  }
+  return args.length > 80 ? `${args.slice(0, 80)}…` : args;
+}

src/cli/ui/ModalCard.tsx

@@ -0,0 +1,115 @@
+/**
+ * Shared visual frame for confirmation modals (ChoiceConfirm,
+ * PlanConfirm, ShellConfirm, EditConfirm, PlanCheckpointConfirm,
+ * PlanReviseConfirm). Renders as a true bordered card matching the
+ * design doc — full accent-colored Unicode box around header + body,
+ * with a horizontal rule separating the title row from the content
+ * area so the modal reads as a discrete interrupt, not just a few
+ * spaced lines in the live region.
+ *
+ * Layout:
+ *
+ *   ╭───────────────────────────────────────────────╮
+ *   │  ICON  TITLE                       subtitle    │
+ *   ├───────────────────────────────────────────────┤
+ *   │                                                │
+ *   │  <children — body of the modal>                │
+ *   │                                                │
+ *   ╰───────────────────────────────────────────────╯
+ *
+ * Color drives the accent (border + icon + title) so the user learns
+ * to recognize the modal type by glance: violet = choice, cyan = plan,
+ * amber = shell, green = edit review, red = budget exhausted.
+ *
+ * Why Ink `borderStyle="round"` is fine here despite the historical
+ * comment about eraseLines miscounts: the modals only render in
+ * single-instance positions (they replace the prompt area, never the
+ * scrollback), so the frame doesn't get re-painted every tick. The
+ * earlier bug class was about animated wide rows wrapping mid-render.
+ */
+
+import { Box, Text, useStdout } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope
+import React from "react";
+
+export interface ModalCardProps {
+  /** Accent color — border + icon + title text. */
+  accent: string;
+  /** Section title — rendered bold in the accent color. */
+  title: string;
+  /** Optional dim subtitle next to the title. */
+  subtitle?: string;
+  /** Optional leading glyph (icon). Rendered in the accent color. */
+  icon?: string;
+  /**
+   * Optional footer slot — renders below a horizontal rule, after the
+   * body. Used for action-button rows like `[apply] [discard]` so they
+   * sit visually pinned to the bottom of the modal regardless of body
+   * scroll height. When absent, the modal ends right after the body.
+   */
+  footer?: React.ReactNode;
+  children: React.ReactNode;
+}
+
+export function ModalCard({
+  accent,
+  title,
+  subtitle,
+  icon,
+  footer,
+  children,
+}: ModalCardProps): React.ReactElement {
+  const { stdout } = useStdout();
+  const cols = stdout?.columns ?? 80;
+  // Subtract 4: 2 cells for the left+right border + 2 cells of paddingX.
+  // Min 28 keeps the rule visible even on absurdly narrow terminals.
+  const innerWidth = Math.min(76, Math.max(28, cols - 6));
+
+  return (
+    <Box flexDirection="column" borderStyle="round" borderColor={accent} paddingX={1} marginY={1}>
+      {/* Header row — icon + bold title in accent color, dim subtitle
+          right-aligned. The horizontal rule below it doubles as a
+          separator and a visual weight that says "this is the thing
+          to read". */}
+      <Box>
+        {icon ? (
+          <>
+            <Text color={accent} bold>
+              {icon}
+            </Text>
+            <Text>{"  "}</Text>
+          </>
+        ) : null}
+        <Text color={accent} bold>
+          {title}
+        </Text>
+        {subtitle ? (
+          <>
+            <Box flexGrow={1} />
+            <Text dimColor>{subtitle}</Text>
+          </>
+        ) : null}
+      </Box>
+      <Box>
+        <Text color={accent} dimColor>
+          {"─".repeat(innerWidth)}
+        </Text>
+      </Box>
+      {/* Body — children render with no extra padding so the modal
+          body looks like one continuous content area inside the border. */}
+      <Box flexDirection="column">{children}</Box>
+      {/* Optional footer — divider rule + slot. Lets modals separate
+          actions from body without each one re-implementing the rule. */}
+      {footer ? (
+        <>
+          <Box>
+            <Text color={accent} dimColor>
+              {"─".repeat(innerWidth)}
+            </Text>
+          </Box>
+          <Box flexDirection="column">{footer}</Box>
+        </>
+      ) : null}
+    </Box>
+  );
+}

src/cli/ui/PlanCheckpointConfirm.tsx

@@ -0,0 +1,118 @@
+/**
+ * Modal-style picker shown when `mark_step_complete` pauses the loop
+ * via `PlanCheckpointError`. Three choices:
+ *
+ *   1. Continue — push "Step X done, proceed." so the model starts
+ *      the next step on the next turn.
+ *   2. Revise   — open a feedback input; whatever the user types
+ *      becomes a synthetic "user feedback for remaining steps" message.
+ *      The model can then adjust its approach without starting the
+ *      whole plan over.
+ *   3. Stop     — push "User stopped the plan. Summarize what was
+ *      done." so the run ends cleanly rather than being abandoned.
+ *
+ * The ✓ step-progress scrollback row is pushed separately (by App.tsx
+ * at checkpoint detection time), so this modal stays a tight picker —
+ * no need to re-render the step body here.
+ */
+
+import { Box } from "ink";
+import React from "react";
+import type { PlanStep } from "../../tools/plan.js";
+import { ModalCard } from "./ModalCard.js";
+import { PlanStepList, type StepStatus } from "./PlanStepList.js";
+import { SingleSelect } from "./Select.js";
+
+export type CheckpointChoice = "continue" | "revise" | "stop";
+
+export interface PlanCheckpointConfirmProps {
+  stepId: string;
+  title?: string;
+  completed: number;
+  total: number;
+  /** Full step list from the approved plan, when available. */
+  steps?: PlanStep[];
+  /** Set of stepIds the model has marked complete so far. */
+  completedStepIds?: Set<string>;
+  onChoose: (choice: CheckpointChoice) => void;
+}
+
+function PlanCheckpointConfirmInner({
+  stepId,
+  title,
+  completed,
+  total,
+  steps,
+  completedStepIds,
+  onChoose,
+}: PlanCheckpointConfirmProps) {
+  const label = title ? `${stepId} · ${title}` : stepId;
+  const counter = total > 0 ? `${completed}/${total}` : "";
+  const isLast = total > 0 && completed >= total;
+  const statuses = buildStatusMap(steps, completedStepIds, stepId, isLast);
+  const subtitle = counter ? `${counter}  ·  ${label}` : label;
+  return (
+    <ModalCard accent="#86efac" icon="✓" title="checkpoint — step done" subtitle={subtitle}>
+      {steps && steps.length > 0 ? (
+        <Box marginBottom={1} flexDirection="column">
+          <PlanStepList steps={steps} statuses={statuses} focusStepId={stepId} />
+        </Box>
+      ) : null}
+      <SingleSelect
+        initialValue={isLast ? "stop" : "continue"}
+        items={[
+          {
+            value: "continue",
+            label: "Continue — run the next step",
+            hint: "Model resumes with the next step. Use this when the result looks right and you don't need to tweak the remaining plan.",
+          },
+          {
+            value: "revise",
+            label: "Revise — give feedback before the next step",
+            hint: "Stay paused, type guidance (scope changes, skip steps, alternative approach). The model adjusts the remaining plan based on your message.",
+          },
+          {
+            value: "stop",
+            label: "Stop — end the plan here",
+            hint: "Model summarizes what was done and ends. Remaining steps are skipped.",
+          },
+        ]}
+        onSubmit={(v) => onChoose(v as CheckpointChoice)}
+        onCancel={() => onChoose("stop")}
+        footer="[↑↓] navigate  ·  [Enter] select  ·  [Esc] stop"
+      />
+    </ModalCard>
+  );
+}
+
+export const PlanCheckpointConfirm = React.memo(PlanCheckpointConfirmInner);
+
+/**
+ * Derive a status map from the plan + completion set + current step.
+ * The currently-just-finished step always renders as "done" even if
+ * completedStepIds hasn't been flushed yet (it gets added in the
+ * same render cycle, order not guaranteed). Steps ahead of the
+ * cursor are "pending"; the next step after the current one isn't
+ * marked "running" because nothing is actually running while the
+ * picker is up — that belongs to the post-continue state.
+ */
+function buildStatusMap(
+  steps: PlanStep[] | undefined,
+  completedStepIds: Set<string> | undefined,
+  currentStepId: string,
+  isLast: boolean,
+): Map<string, StepStatus> {
+  const map = new Map<string, StepStatus>();
+  if (!steps) return map;
+  for (const step of steps) {
+    if (completedStepIds?.has(step.id) || step.id === currentStepId) {
+      map.set(step.id, "done");
+    } else {
+      map.set(step.id, "pending");
+    }
+  }
+  if (isLast) {
+    // Every step is done; leave as "done" — no "running" overlay.
+  }
+  return map;
+}

src/cli/ui/PlanConfirm.tsx

@@ -9,99 +9,34 @@
  *   3. Cancel — exits plan mode, drops the plan, tells the model the
  *      user didn't want any of it.
  *
- * Mirrors ShellConfirm in structure (border, SingleSelect, three
- * options, no y/n hotkey — mid-typing triggers would be painful).
- * The plan body is rendered verbatim above the picker so the user can
- * actually read what they're approving.
+ * The plan BODY is NOT rendered inside this modal — App.tsx pushes it
+ * into the Static scrollback as a `role: "plan"` display event the
+ * moment submit_plan fires. That's a one-time markdown render into
+ * permanent history, so the user reads the full proposal above and
+ * the modal below stays a tight picker. The previous design (body
+ * rendered inside the modal with an aggressive line clamp) left users
+ * staring at "(25 more lines truncated)" and unable to approve safely.
  */
 
 import { Box, Text } from "ink";
 import React from "react";
+import type { PlanStep } from "../../tools/plan.js";
+import { ModalCard } from "./ModalCard.js";
+import { PlanStepList } from "./PlanStepList.js";
 import { SingleSelect } from "./Select.js";
-import { Markdown } from "./markdown.js";
 
 export type PlanConfirmChoice = "approve" | "refine" | "cancel";
 
 export interface PlanConfirmProps {
   plan: string;
+  steps?: PlanStep[];
+  /** Optional human-friendly title from the model — surfaced in the header. */
+  summary?: string;
   onChoose: (choice: PlanConfirmChoice) => void;
-  /**
-   * Cap on rendered plan length. A pathological 20-KB plan would push
-   * the picker off the bottom of the terminal; we show the head +
-   * "(…N chars truncated — /tool for full output)" instead. The picker
-   * itself gets the full plan (it's already been committed to the
-   * transcript via the tool result).
-   */
-  maxRenderedChars?: number;
   projectRoot?: string;
-  /**
-   * Override the terminal-row count used for vertical clamping. Tests
-   * pass this to avoid depending on `process.stdout.rows`; runtime
-   * callers leave it unset and we read the real TTY size.
-   */
-  terminalRows?: number;
 }
 
-const DEFAULT_MAX_RENDERED = 2400;
-/**
- * Reserved terminal rows for the picker chrome (border + header +
- * divider + open-questions hint + SingleSelect with three options +
- * footer + the assistant-turn block Ink already printed above).
- * Empirically ~16; we round up to 18 for safety.
- */
-const PICKER_CHROME_ROWS = 18;
-/**
- * Rough markdown expansion factor. One source line commonly renders
- * as 1–3 terminal rows: wrap on narrow terminals doubles long lines,
- * code fences add top/bottom rules, list items get bullet indent,
- * headings sometimes pick up blank rows. A factor of 2 is the
- * conservative bet that lets us keep `bodyRowBudget` > 0 on a 24-row
- * terminal while still guaranteeing the picker stays on-screen. If
- * this is wrong in practice it's wrong in the "trim too aggressively"
- * direction, which shows a truncation marker rather than flickering.
- */
-const MARKDOWN_EXPANSION = 2;
-const MIN_BODY_ROWS = 4;
-
-/**
- * Trim `text` to the first `maxLines` source lines, appending a
- * truncation marker when it was cut. Source lines, NOT rendered rows
- * — callers must divide their row budget by the expected markdown
- * expansion factor before passing it here.
- */
-export function clampBodyByLines(text: string, maxLines: number): string {
-  const lines = text.split("\n");
-  if (lines.length <= maxLines) return text;
-  const kept = lines.slice(0, maxLines).join("\n");
-  const dropped = lines.length - maxLines;
-  return `${kept}\n\n… (${dropped} more lines truncated — resize the terminal to see more, or /tool for the full proposal)`;
-}
-
-function PlanConfirmInner({
-  plan,
-  onChoose,
-  maxRenderedChars,
-  projectRoot,
-  terminalRows,
-}: PlanConfirmProps) {
-  const cap = maxRenderedChars ?? DEFAULT_MAX_RENDERED;
-  const charTrunc = plan.length > cap;
-  const charCapped = charTrunc
-    ? `${plan.slice(0, cap)}\n\n… (${plan.length - cap} chars truncated — use /tool to view the full proposal)`
-    : plan;
-  // Vertical clamp. Flicker root-cause: when rendered content exceeds
-  // the TTY row count Ink falls back to "clear + full redraw" each
-  // frame, and every parent re-render redraws the big Markdown subtree.
-  // Capping the body to (rows - picker chrome) keeps the whole modal
-  // inside the terminal so Ink uses incremental diffs and the picker
-  // stops thrashing. See Bug A in 0.5.14.
-  const rows = terminalRows ?? process.stdout?.rows ?? 24;
-  const renderedBudget = Math.max(MIN_BODY_ROWS * MARKDOWN_EXPANSION, rows - PICKER_CHROME_ROWS);
-  // Divide by the expansion factor so source-line clamp produces a
-  // rendered height that actually fits the terminal. Without this the
-  // rendered body overflows → Ink clears + redraws each frame → flicker.
-  const sourceLineBudget = Math.max(MIN_BODY_ROWS, Math.floor(renderedBudget / MARKDOWN_EXPANSION));
-  const visible = clampBodyByLines(charCapped, sourceLineBudget);
+function PlanConfirmInner({ plan, steps, summary, onChoose }: PlanConfirmProps) {
   // Crude signal for "the model left questions or risks for me" — the
   // typical section headings. Triggers an extra hint toward the Refine
   // option so users know where to answer them.
@@ -110,55 +45,50 @@ function PlanConfirmInner({
     /^#{1,6}\s*(待确认|开放问题|风险|未知|假设|不确定)/im.test(plan);
 
   return (
-    <Box flexDirection="column" borderStyle="round" borderColor="cyan" paddingX={1} marginY={1}>
-      <Box>
-        <Text bold color="cyan">
-          ▸ plan submitted — awaiting your review
-        </Text>
-      </Box>
-      <Box>
-        <Text color="cyan" dimColor>
-          {"──────────────────────────────────────────"}
-        </Text>
-      </Box>
-      <Box marginTop={1} flexDirection="column">
-        <Markdown text={visible} projectRoot={projectRoot} />
-      </Box>
+    <ModalCard
+      accent="#67e8f9"
+      icon="📋"
+      title="plan proposed"
+      subtitle={summary ?? "approve / refine / cancel"}
+    >
       {hasOpenQuestions ? (
-        <Box marginTop={1}>
-          <Text color="yellow">
-            ▲ the plan has open questions or flagged risks — pick{" "}
+        <Box marginBottom={1}>
+          <Text color="#fbbf24">
+            ▲ the plan flags open questions or risks — pick{" "}
             <Text bold>Refine / answer questions</Text> to write concrete answers before the model
             moves on.
           </Text>
         </Box>
       ) : null}
-      <Box marginTop={1}>
-        <SingleSelect
-          initialValue={hasOpenQuestions ? "refine" : "approve"}
-          items={[
-            {
-              value: "approve",
-              label: "Approve and implement",
-              hint: "Exit plan mode. The model starts executing. You'll get a text input to add any last instructions (or just press Enter to skip).",
-            },
-            {
-              value: "refine",
-              label: "Refine / answer questions",
-              hint: "Stay in plan mode. Write answers, modifications, or critiques; the model revises and re-submits.",
-            },
-            {
-              value: "cancel",
-              label: "Cancel",
-              hint: "Exit plan mode. Drop the plan; the model won't implement it.",
-            },
-          ]}
-          onSubmit={(v) => onChoose(v as PlanConfirmChoice)}
-          onCancel={() => onChoose("cancel")}
-          footer="[↑↓] navigate  ·  [Enter] select  ·  [Esc] cancel"
-        />
-      </Box>
-    </Box>
+      {steps && steps.length > 0 ? (
+        <Box marginBottom={1} flexDirection="column">
+          <PlanStepList steps={steps} />
+        </Box>
+      ) : null}
+      <SingleSelect
+        initialValue={hasOpenQuestions ? "refine" : "approve"}
+        items={[
+          {
+            value: "approve",
+            label: "Approve and implement",
+            hint: "Exit plan mode. The model starts executing. You'll get a text input to add any last instructions (or just press Enter to skip).",
+          },
+          {
+            value: "refine",
+            label: "Refine / answer questions",
+            hint: "Stay in plan mode. Write answers, modifications, or critiques; the model revises and re-submits.",
+          },
+          {
+            value: "cancel",
+            label: "Cancel",
+            hint: "Exit plan mode. Drop the plan; the model won't implement it.",
+          },
+        ]}
+        onSubmit={(v) => onChoose(v as PlanConfirmChoice)}
+        onCancel={() => onChoose("cancel")}
+        footer="[↑↓] navigate  ·  [Enter] select  ·  [Esc] cancel"
+      />
+    </ModalCard>
   );
 }
 

src/cli/ui/PlanRefineInput.tsx

@@ -14,17 +14,24 @@
  * the picker without resuming.
  */
 
-import { Box, Text, useInput } from "ink";
+import { Box, Text } from "ink";
 import React, { useState } from "react";
+import { ModalCard } from "./ModalCard.js";
+import { useKeystroke } from "./keystroke-context.js";
+import { COLOR } from "./theme.js";
+import { useTick } from "./ticker.js";
 
 export interface PlanRefineInputProps {
   /**
-   * Which path the user is on. Approve = "implement with these last
-   * instructions"; refine = "revise the plan with this feedback".
-   * Drives the header + hint text so users know what kind of message
-   * they're writing.
+   * Which path the user is on. approve = "implement with these last
+   * instructions"; refine = "revise the plan with this feedback";
+   * checkpoint-revise = mid-execution pause, user is tweaking the
+   * remaining plan after seeing a step's result; choice-custom = user
+   * typed an off-list answer to an ask_choice branch. Drives the
+   * header + hint text so users know what kind of message they're
+   * writing.
    */
-  mode: "approve" | "refine";
+  mode: "approve" | "refine" | "checkpoint-revise" | "choice-custom";
   /** Called with trimmed feedback. Empty string is allowed. */
   onSubmit: (feedback: string) => void;
   /** Called when the user presses Esc to return to the picker. */
@@ -34,58 +41,94 @@ export interface PlanRefineInputProps {
 export function PlanRefineInput({ mode, onSubmit, onCancel }: PlanRefineInputProps) {
   const [value, setValue] = useState("");
 
-  useInput((input, key) => {
-    if (key.escape) {
+  useKeystroke((ev) => {
+    if (ev.paste) {
+      // Insert paste content as-is. Multi-line pastes flatten via
+      // newlines becoming spaces because this is a single-line input.
+      setValue((v) => v + ev.input.replace(/\r?\n/g, " "));
+      return;
+    }
+    if (ev.escape) {
       onCancel();
       return;
     }
-    if (key.return) {
+    if (ev.return) {
       onSubmit(value.trim());
       return;
     }
-    if (key.backspace || key.delete) {
+    if (ev.backspace || ev.delete) {
       setValue((v) => v.slice(0, -1));
       return;
     }
     // Filter out non-printable chars; accept ordinary text + CJK.
-    if (input && !key.ctrl && !key.meta) {
-      setValue((v) => v + input);
+    if (ev.input && !ev.ctrl && !ev.meta) {
+      setValue((v) => v + ev.input);
     }
   });
 
-  const title =
+  const tick = useTick();
+  // Slow blink for the cursor block (~480 ms on/off). Same cadence
+  // as the wordmark's brand-mark pulse; reads as "input is alive".
+  const cursorOn = Math.floor(tick / 4) % 2 === 0;
+
+  const meta =
     mode === "approve"
-      ? "▸ approving — any last instructions or answers to open questions?"
-      : "▸ refining — what should the model change?";
+      ? {
+          title: "approving — any last instructions?",
+          icon: "◇",
+          accent: COLOR.primary,
+        }
+      : mode === "checkpoint-revise"
+        ? {
+            title: "revising — what should change before the next step?",
+            icon: "✎",
+            accent: COLOR.warn,
+          }
+        : mode === "choice-custom"
+          ? {
+              title: "custom answer — type whatever fits",
+              icon: "⌥",
+              accent: COLOR.accent,
+            }
+          : {
+              title: "refining — what should the model change?",
+              icon: "✎",
+              accent: COLOR.warn,
+            };
   const hint =
     mode === "approve"
       ? "Answer questions the plan raised, add constraints, or just press Enter to approve as-is."
-      : "Describe what's wrong or missing, or answer questions the plan raised.";
+      : mode === "checkpoint-revise"
+        ? "Scope change, skip steps, alternative approach — the model adjusts the remaining plan."
+        : mode === "choice-custom"
+          ? "Free-form reply. The model reads it verbatim and proceeds — no need to match the listed options."
+          : "Describe what's wrong or missing, or answer questions the plan raised.";
   const blankHint =
     mode === "approve"
       ? " (Enter with blank = approve without extra instructions.)"
-      : " (Enter with blank = ask the model to list concrete questions.)";
+      : mode === "checkpoint-revise"
+        ? " (Enter with blank = continue with the current plan.)"
+        : mode === "choice-custom"
+          ? " (Enter with blank = ask the model what you actually want.)"
+          : " (Enter with blank = ask the model to list concrete questions.)";
 
   return (
-    <Box flexDirection="column" borderStyle="round" borderColor="yellow" paddingX={1} marginY={1}>
-      <Box>
-        <Text bold color="yellow">
-          {title}
-        </Text>
-      </Box>
-      <Box marginTop={1}>
+    <ModalCard accent={meta.accent} icon={meta.icon} title={meta.title}>
+      <Box marginBottom={1}>
         <Text dimColor>
           {hint} Enter to send · Esc to return to the picker.
           {value === "" ? blankHint : ""}
         </Text>
       </Box>
-      <Box marginTop={1}>
-        <Text>
-          <Text color="yellow">› </Text>
-          <Text>{value || " "}</Text>
-          <Text color="yellow">▍</Text>
+      <Box>
+        <Text color={meta.accent} bold>
+          {"› "}
+        </Text>
+        <Text>{value}</Text>
+        <Text color={meta.accent} bold>
+          {cursorOn ? "▍" : " "}
         </Text>
       </Box>
-    </Box>
+    </ModalCard>
   );
 }

src/cli/ui/PlanReviseConfirm.tsx

@@ -0,0 +1,141 @@
+/**
+ * Modal shown when the model proposes a plan revision via
+ * `revise_plan`. Renders a step-level diff between the old remaining
+ * tail and the new proposed tail:
+ *
+ *    ●● ✓ step-2 · Wire middleware           (kept, dim)
+ *  − ●●● ✗ step-3 · Migrate session cookies  (removed, red)
+ *  + ●●  ▶ step-3 · Skip cookie migration    (added, green)
+ *  + ●●  ▶ step-4 · Update cookie tests      (added, green)
+ *
+ * Two buttons: Accept / Reject. Accept replaces the in-memory plan's
+ * remaining steps with the new ones; Reject leaves the original plan
+ * intact and lets the model continue. The picker's border is amber
+ * to distinguish from the green checkpoint picker — revisions are a
+ * different decision point, deserve a different visual lane.
+ */
+
+import { Box, Text } from "ink";
+import React from "react";
+import type { PlanStep } from "../../tools/plan.js";
+import { ModalCard } from "./ModalCard.js";
+import { SingleSelect } from "./Select.js";
+
+export type ReviseChoice = "accept" | "reject";
+
+export interface PlanReviseConfirmProps {
+  reason: string;
+  /** Remaining steps from the current plan (before this revision). */
+  oldRemaining: PlanStep[];
+  /** Remaining steps the model is proposing as a replacement. */
+  newRemaining: PlanStep[];
+  /** Optional updated plan summary. */
+  summary?: string;
+  onChoose: (choice: ReviseChoice) => void;
+}
+
+interface DiffRow {
+  kind: "kept" | "removed" | "added";
+  step: PlanStep;
+}
+
+function computeDiff(oldSteps: PlanStep[], newSteps: PlanStep[]): DiffRow[] {
+  const oldIds = new Set(oldSteps.map((s) => s.id));
+  const newIds = new Set(newSteps.map((s) => s.id));
+  const rows: DiffRow[] = [];
+  // Show removed (in old, not in new) first — preserve original order.
+  for (const s of oldSteps) {
+    if (!newIds.has(s.id)) rows.push({ kind: "removed", step: s });
+  }
+  // Then walk new list. Steps in both lists render as kept; new-only as added.
+  for (const s of newSteps) {
+    rows.push({ kind: oldIds.has(s.id) ? "kept" : "added", step: s });
+  }
+  return rows;
+}
+
+function riskDots(risk: PlanStep["risk"]): { dots: string; color: string } {
+  switch (risk) {
+    case "high":
+      return { dots: "●●●", color: "#f87171" };
+    case "med":
+      return { dots: "●● ", color: "#fbbf24" };
+    case "low":
+      return { dots: "●  ", color: "#4ade80" };
+    default:
+      return { dots: "   ", color: "#94a3b8" };
+  }
+}
+
+function PlanReviseConfirmInner({
+  reason,
+  oldRemaining,
+  newRemaining,
+  summary,
+  onChoose,
+}: PlanReviseConfirmProps) {
+  const rows = computeDiff(oldRemaining, newRemaining);
+  const removedCount = rows.filter((r) => r.kind === "removed").length;
+  const addedCount = rows.filter((r) => r.kind === "added").length;
+  const keptCount = rows.filter((r) => r.kind === "kept").length;
+  return (
+    <ModalCard
+      accent="#fbbf24"
+      icon="✏"
+      title="plan revision proposed"
+      subtitle={`−${removedCount}  +${addedCount}  ·  ${keptCount} kept`}
+    >
+      <Box marginBottom={1}>
+        <Text>{reason}</Text>
+      </Box>
+      {summary ? (
+        <Box marginBottom={1}>
+          <Text dimColor>{`updated summary: ${summary}`}</Text>
+        </Box>
+      ) : null}
+      <Box marginBottom={1} flexDirection="column">
+        {rows.map((row) => {
+          const risk = riskDots(row.step.risk);
+          const prefix = row.kind === "removed" ? "−" : row.kind === "added" ? "+" : " ";
+          const prefixColor =
+            row.kind === "removed" ? "#f87171" : row.kind === "added" ? "#4ade80" : "#94a3b8";
+          const dim = row.kind === "kept";
+          const strike = row.kind === "removed";
+          return (
+            <Box key={`${row.kind}-${row.step.id}`}>
+              <Text color={prefixColor} bold>
+                {`${prefix} `}
+              </Text>
+              <Text color={risk.color} bold dimColor={dim}>
+                {risk.dots}
+              </Text>
+              <Text dimColor={dim} strikethrough={strike}>
+                {` ${row.step.id} · ${row.step.title}`}
+              </Text>
+            </Box>
+          );
+        })}
+      </Box>
+      <SingleSelect
+        initialValue="accept"
+        items={[
+          {
+            value: "accept",
+            label: "Accept revision — apply the new step list",
+            hint: "Replaces the remaining plan with the proposed steps. Done steps are untouched.",
+          },
+          {
+            value: "reject",
+            label: "Reject — keep the original plan",
+            hint: "Drops the proposal. Model continues with the original remaining steps.",
+          },
+        ]}
+        onSubmit={(v) => onChoose(v as ReviseChoice)}
+        onCancel={() => onChoose("reject")}
+        footer="[↑↓] navigate  ·  [Enter] select  ·  [Esc] reject"
+      />
+    </ModalCard>
+  );
+}
+
+export const PlanReviseConfirm = React.memo(PlanReviseConfirmInner);

src/cli/ui/PlanStateBlock.tsx

@@ -9,39 +9,44 @@
  *   - uncertainties:  yellow       — attention required (like tool)
  *   - rejected paths: red dim      — ruled out (muted, like error-but-resolved)
  *
- * Only the label is colored + bold. The items themselves render in the
- * terminal's default foreground, so they stay readable on any background —
- * which is why the old single-magenta block was hard to see on dark themes.
+ * Visual: colored bold label + count, then dim items. No solid-bg pill
+ * — every assistant turn surfaces this block, so the bracket-text style
+ * keeps it from shouting four colored bg blocks at the user every turn.
+ * Color alone (the bold label) is enough to identify the field type.
  */
 
 import { Box, Text } from "ink";
 import React from "react";
 import type { TypedPlanState } from "../../harvest.js";
+import { COLOR } from "./theme.js";
 
-type FieldColor = "cyan" | "green" | "yellow" | "red";
+type FieldColor = string;
 
 export function PlanStateBlock({ planState }: { planState: TypedPlanState }) {
   const fields: Array<[string, string[], FieldColor, boolean]> = [];
-  if (planState.subgoals.length) fields.push(["subgoals", planState.subgoals, "cyan", false]);
+  if (planState.subgoals.length)
+    fields.push(["subgoals", planState.subgoals, COLOR.primary, false]);
   if (planState.hypotheses.length)
-    fields.push(["hypotheses", planState.hypotheses, "green", false]);
+    fields.push(["hypotheses", planState.hypotheses, COLOR.assistant, false]);
   if (planState.uncertainties.length)
-    fields.push(["uncertainties", planState.uncertainties, "yellow", false]);
+    fields.push(["uncertainties", planState.uncertainties, COLOR.warn, false]);
   if (planState.rejectedPaths.length)
-    fields.push(["rejected", planState.rejectedPaths, "red", true]);
+    fields.push(["rejected", planState.rejectedPaths, COLOR.info, true]);
   if (fields.length === 0) return null;
 
   return (
     <Box flexDirection="column" marginBottom={1}>
       {fields.map(([label, items, color, dim]) => (
-        <Text key={label}>
+        <Box key={label}>
           <Text color={color} bold dimColor={dim}>
-            {"‹ "}
             {label}
           </Text>
           <Text dimColor>{` (${items.length})`}</Text>
-          <Text>{`: ${items.join(" · ")}`}</Text>
-        </Text>
+          <Text dimColor>{"  · "}</Text>
+          <Text dimColor={dim} color={dim ? undefined : COLOR.info}>
+            {items.join(" · ")}
+          </Text>
+        </Box>
       ))}
     </Box>
   );

src/cli/ui/PlanStepList.tsx

@@ -0,0 +1,159 @@
+/**
+ * Compact tree-style renderer for a plan's structured step list. Used
+ * by PlanConfirm (on approval) and PlanCheckpointConfirm (mid-execution)
+ * so the user always sees the same visual representation.
+ *
+ * Layout per step:
+ *
+ *     2/5 done (40%) · est. 5 steps
+ *     ┣  ✓  step-1 · Extract tokens into a module
+ *     ┣  ✓  step-2 · Migrate session cookies            ⚠ med
+ *     ┣  ▸  step-3 · Update tests                       ⚠ high
+ *     ┣  ○  step-4 · Run regression suite
+ *     ┗  ○  step-5 · Audit every callsite
+ *        ████████░░░░░░░░░░░░  40%
+ *
+ * Why this shape:
+ *   - Status icons (✓ ▸ ○ ✗) read at a glance — color + glyph are
+ *     redundant signals, useful for color-blind users and for
+ *     terminals where a single bg-color cell is the only contrast.
+ *   - Tree branch lines (┣ ┗) visually bind the steps as one group
+ *     and mark "last step" with a corner — the eye finds the bottom
+ *     without counting.
+ *   - Risk only shown ≥medium. low risk on every line is noise (most
+ *     steps are low-risk — that's the default). med + high are the
+ *     ones that deserve attention before approve.
+ *   - Bottom progress bar (24 cells of █ / ░) makes "how far in are
+ *     we" answerable from the cursor's eye position alone.
+ */
+
+import { Box, Text } from "ink";
+import React from "react";
+import type { PlanStep, PlanStepRisk } from "../../tools/plan.js";
+import { CharBar } from "./char-bar.js";
+import { COLOR, GLYPH } from "./theme.js";
+
+export type StepStatus = "pending" | "running" | "done" | "skipped";
+
+export interface PlanStepListProps {
+  steps: PlanStep[];
+  /**
+   * Map of stepId → status. Missing ids default to "pending" so a
+   * plan just submitted (no completions yet) renders cleanly.
+   */
+  statuses?: Map<string, StepStatus> | Record<string, StepStatus>;
+  /**
+   * Optional current step — rendered with the `cur` (▸) glyph in cyan
+   * even when its status is still "pending", so the user sees which
+   * one's about to run. If the step's status is "running" we always
+   * use the cur glyph regardless of focusStepId.
+   */
+  focusStepId?: string;
+}
+
+function getStatus(stepId: string, statuses: PlanStepListProps["statuses"]): StepStatus {
+  if (!statuses) return "pending";
+  if (statuses instanceof Map) {
+    return statuses.get(stepId) ?? "pending";
+  }
+  return statuses[stepId] ?? "pending";
+}
+
+interface StatusGlyph {
+  glyph: string;
+  color: string;
+}
+
+/**
+ * Map (status, focus) → (glyph, color). Centralized so a future tweak
+ * (e.g. add a "queued for retry" state) lands in one switch instead of
+ * five render branches.
+ */
+function statusGlyph(status: StepStatus, isCur: boolean): StatusGlyph {
+  if (status === "done") return { glyph: GLYPH.done, color: COLOR.ok };
+  if (status === "running") return { glyph: GLYPH.cur, color: COLOR.primary };
+  if (status === "skipped") return { glyph: GLYPH.fail, color: COLOR.info };
+  // pending: focus override gets the cur glyph (▸) in primary color so
+  // the active row pops without us needing a separate column.
+  if (isCur) return { glyph: GLYPH.cur, color: COLOR.primary };
+  return { glyph: GLYPH.pending, color: COLOR.info };
+}
+
+function riskLabel(risk: PlanStepRisk | undefined): { text: string; color: string } | null {
+  if (risk === "med") return { text: `${GLYPH.warn} med`, color: COLOR.warn };
+  if (risk === "high") return { text: `${GLYPH.warn} high`, color: COLOR.err };
+  // low + undefined: omitted entirely (the default reading should be
+  // "low risk" — surfacing it on every line buries the med/high ones).
+  return null;
+}
+
+function PlanStepListInner({ steps, statuses, focusStepId }: PlanStepListProps) {
+  if (steps.length === 0) return null;
+  const statusList = steps.map((s) => getStatus(s.id, statuses));
+  const total = steps.length;
+  const doneCount = statusList.filter((s) => s === "done").length;
+  const pct = Math.round((doneCount / total) * 100);
+  // Show progress only when the plan has any motion. A freshly-submitted
+  // plan with 0/N done renders without the bar to avoid an empty
+  // "░░░░░░░░░░ 0%" rule that signals nothing.
+  const showProgress = doneCount > 0;
+
+  return (
+    <Box flexDirection="column">
+      <Box>
+        <Text dimColor>
+          {showProgress
+            ? `${doneCount}/${total} done (${pct}%) · ${total} step${total === 1 ? "" : "s"}`
+            : `${total} step${total === 1 ? "" : "s"}`}
+        </Text>
+      </Box>
+      <Box flexDirection="column">
+        {steps.map((step, i) => {
+          const status = statusList[i]!;
+          const isLast = i === total - 1;
+          const isCur = focusStepId === step.id;
+          const sg = statusGlyph(status, isCur);
+          const risk = riskLabel(step.risk);
+          const titleDim = status === "done" || status === "skipped";
+          return (
+            <Box key={step.id}>
+              <Text color={COLOR.info} dimColor>
+                {isLast ? GLYPH.branchEnd : GLYPH.branch}
+              </Text>
+              <Text>{"  "}</Text>
+              <Text color={sg.color} bold={status === "running" || isCur}>
+                {sg.glyph}
+              </Text>
+              <Text>{"  "}</Text>
+              <Text
+                dimColor={titleDim}
+                bold={isCur || status === "running"}
+                strikethrough={status === "done" || status === "skipped"}
+              >
+                {`${step.id} · ${step.title}`}
+              </Text>
+              {risk ? (
+                <>
+                  <Text>{"   "}</Text>
+                  <Text color={risk.color}>{risk.text}</Text>
+                </>
+              ) : null}
+            </Box>
+          );
+        })}
+      </Box>
+      {showProgress ? (
+        <Box>
+          <Text>{"      "}</Text>
+          <CharBar pct={pct} width={24} />
+        </Box>
+      ) : null}
+    </Box>
+  );
+}
+
+export const PlanStepList = React.memo(PlanStepListInner);
+
+export function riskOf(step: PlanStep): PlanStepRisk | undefined {
+  return step.risk;
+}

src/cli/ui/PromptInput.tsx

@@ -1,7 +1,52 @@
-import { Box, Text, useInput } from "ink";
+import { Box, Text, useStdout } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React as a runtime value (classic transform compiles JSX to React.createElement)
 import React, { useRef, useState } from "react";
+import { useKeystroke } from "./keystroke-context.js";
 import { type MultilineKey, lineAndColumn, processMultilineKey } from "./multiline-keys.js";
-import { useTick } from "./ticker.js";
+import {
+  PASTE_SENTINEL_RANGE,
+  type PasteEntry,
+  encodePasteSentinel,
+  expandPasteSentinels,
+  listPasteIdsInBuffer,
+  makePasteEntry,
+} from "./paste-sentinels.js";
+import { type Segment, buildViewport, stringCells } from "./prompt-viewport.js";
+import { GRADIENT } from "./theme.js";
+
+/**
+ * Visual anchor: a left vertical rule (▎ + space) running down every
+ * line of the input. Colored with the accent color so disabled state
+ * dims it; gives the input area a clear "you type here" boundary
+ * without using bordered Boxes (those amplified Ink's eraseLines
+ * miscount on Windows). Length is fixed at 2 so the prefix-cell math
+ * stays trivial.
+ */
+const BAR = "▎ ";
+
+/**
+ * Prompt input v2 — no Ink useInput, no Yoga text wrapping, no
+ * cursor blink. Replaces the bordered-Box / multi-Text approach
+ * that was driving the Windows ghost-row regressions.
+ *
+ * Pipeline:
+ *   - Subscribes to the global keystroke bus (which is fed by our
+ *     own raw stdin parser, NOT Ink's parse-keypress).
+ *   - Pure events: `paste` events go to the paste registry; everything
+ *     else flows through `processMultilineKey` (the existing reducer
+ *     with all the cursor / submit / history-recall semantics).
+ *   - Render: one logical line per <Box> row. Each row renders as
+ *     EXACTLY one visual row — content longer than the visible cell
+ *     budget is clipped via `buildViewport`, with `‹` / `›` markers
+ *     where content is hidden. The cursor moves the viewport so it
+ *     stays visible.
+ *
+ * Cursor blinks at ~480 ms half-period. The ticker that drives the
+ * blink also flows the left-bar gradient and the wordmark, so
+ * we're already paying for re-render every tick — the cursor blink
+ * is free on top of that. Disabled state freezes the cursor solid
+ * so the disabled prompt doesn't compete with the active spinner.
+ */
 
 export interface PromptInputProps {
   value: string;
@@ -9,156 +54,516 @@ export interface PromptInputProps {
   onSubmit: (v: string) => void;
   disabled?: boolean;
   placeholder?: string;
+  /**
+   * History recall. Fired when ↑/↓ hits a buffer boundary (empty
+   * buffer, or cursor already at the first/last line of a multi-line
+   * buffer). Parent walks its prompt history and swaps the value via
+   * `onChange`. Absent → keys are consumed silently.
+   */
+  onHistoryPrev?: () => void;
+  onHistoryNext?: () => void;
 }
 
-/**
- * Input box with real cursor support. ←/→ move one column, ↑/↓ move
- * across lines in multi-line buffers, Ctrl+A / Ctrl+E jump to
- * start/end of the current line. Backspace deletes before cursor,
- * Delete deletes under cursor. Multi-line composition via Ctrl+J,
- * Shift+Enter, or bash-style `\<Enter>`.
- *
- * Cursor state lives locally. When the parent replaces `value` out
- * of band (history recall, slash completion, setup wizard) the
- * cursor jumps to end; the `lastLocalValueRef` guards distinguishes
- * that case from our own edits.
- */
 export function PromptInput({
   value,
   onChange,
   onSubmit,
   disabled,
   placeholder,
+  onHistoryPrev,
+  onHistoryNext,
 }: PromptInputProps) {
   const [cursor, setCursor] = useState(value.length);
-  // Tracks the last `value` we ourselves produced via onChange. If the
-  // incoming `value` prop diverges from this, the parent (or some other
-  // source) replaced the buffer — we reset the cursor to end.
+
+  // Paste registry — keyed by sentinel id, holds original content.
+  const pastesRef = useRef<Map<number, PasteEntry>>(new Map());
+  const nextPasteIdRef = useRef<number>(0);
+
+  // Track external value replacement (history recall, slash completion).
+  // When the parent swaps `value` we snap cursor to end.
   const lastLocalValueRef = useRef(value);
   if (value !== lastLocalValueRef.current) {
     lastLocalValueRef.current = value;
-    if (cursor !== value.length) {
-      // Conditional setState during render is the "derived state" pattern;
-      // React schedules the re-render and the else branch of the `if`
-      // prevents infinite loops.
-      setCursor(value.length);
-    }
+    if (cursor !== value.length) setCursor(value.length);
   }
 
-  // Shared ticker drives the cursor blink. Dividing the tick by 4 lands
-  // the visible on/off cycle around 480ms — standard cursor cadence.
-  const tick = useTick();
-  const showCursor = disabled ? false : Math.floor(tick / 4) % 2 === 0;
+  /**
+   * Register one paste blob and insert its sentinel at the current
+   * cursor. Used both by `paste` events from the stdin reader (the
+   * normal path on terminals that support DECSET 2004) and by the
+   * fallback path inside `processMultilineKey` for chunks that
+   * arrived without bracketed-paste markers.
+   */
+  const registerPaste = (content: string) => {
+    const v = lastLocalValueRef.current;
+    const c = cursor;
+    const id = nextPasteIdRef.current % PASTE_SENTINEL_RANGE;
+    nextPasteIdRef.current = id + 1;
+    pastesRef.current.set(id, makePasteEntry(id, content));
+    const sentinel = encodePasteSentinel(id);
+    const next = v.slice(0, c) + sentinel + v.slice(c);
+    lastLocalValueRef.current = next;
+    onChange(next);
+    setCursor(c + 1);
+  };
 
-  useInput(
-    (input, key) => {
-      const ke: MultilineKey = {
-        input,
-        return: key.return,
-        shift: key.shift,
-        ctrl: key.ctrl,
-        meta: key.meta,
-        backspace: key.backspace,
-        delete: key.delete,
-        tab: key.tab,
-        upArrow: key.upArrow,
-        downArrow: key.downArrow,
-        leftArrow: key.leftArrow,
-        rightArrow: key.rightArrow,
-        escape: key.escape,
-        pageUp: key.pageUp,
-        pageDown: key.pageDown,
-      };
-      const action = processMultilineKey(value, cursor, ke);
-      if (action.next !== null) {
-        lastLocalValueRef.current = action.next;
-        onChange(action.next);
+  useKeystroke((ev) => {
+    if (disabled) return;
+    if (ev.paste) {
+      // Bracketed-paste content delivered by the stdin reader.
+      // Insert as one sentinel regardless of length.
+      if (ev.input.length > 0) registerPaste(ev.input);
+      return;
+    }
+    const key: MultilineKey = {
+      input: ev.input,
+      return: ev.return,
+      shift: ev.shift,
+      ctrl: ev.ctrl,
+      meta: ev.meta,
+      backspace: ev.backspace,
+      delete: ev.delete,
+      tab: ev.tab,
+      upArrow: ev.upArrow,
+      downArrow: ev.downArrow,
+      leftArrow: ev.leftArrow,
+      rightArrow: ev.rightArrow,
+      escape: ev.escape,
+      pageUp: ev.pageUp,
+      pageDown: ev.pageDown,
+    };
+    const action = processMultilineKey(value, cursor, key);
+    if (action.pasteRequest) {
+      registerPaste(action.pasteRequest.content);
+      return;
+    }
+    if (action.next !== null) {
+      lastLocalValueRef.current = action.next;
+      onChange(action.next);
+    }
+    if (action.cursor !== null) {
+      setCursor(action.cursor);
+    }
+    if (action.submit) {
+      const raw = action.submitValue ?? value;
+      const expanded = expandPasteSentinels(raw, pastesRef.current);
+      // GC unreachable paste entries — anything backspace'd out of
+      // the buffer before submit. Keeps the registry from growing
+      // unbounded across many turns.
+      const reachable = new Set(listPasteIdsInBuffer(raw));
+      for (const id of pastesRef.current.keys()) {
+        if (!reachable.has(id)) pastesRef.current.delete(id);
       }
-      if (action.cursor !== null) {
-        setCursor(action.cursor);
-      }
-      if (action.submit) onSubmit(action.submitValue ?? value);
-    },
-    { isActive: !disabled },
-  );
+      onSubmit(expanded);
+    }
+    if (action.historyHandoff === "prev") onHistoryPrev?.();
+    if (action.historyHandoff === "next") onHistoryNext?.();
+  }, !disabled);
 
+  // ── Render ──────────────────────────────────────────────────────
+
+  const { stdout } = useStdout();
+  const cols = stdout?.columns ?? 80;
+  const narrow = cols <= 90;
+  const promptBody = narrow ? "› " : "you › ";
+  const promptPrefix = BAR + promptBody;
+  const continuationIndent = BAR + " ".repeat(promptBody.length);
+  const prefixCells = promptPrefix.length;
+  // Reserve 2 cells for the surrounding `paddingX={1}` plus 1 cell
+  // for the cursor block when at end-of-line. Net visible budget per
+  // line.
+  const visibleCells = Math.max(8, cols - prefixCells - 3);
+
+  const placeholderActive = narrow
+    ? "type a message, or /command"
+    : "type a message, or /command  ·  [Ctrl+J] newline  ·  [Ctrl+P/N] history";
   const effectivePlaceholder = disabled
-    ? (placeholder ?? "…waiting for response…  ·  [Esc] to stop")
-    : (placeholder ?? "type a message, or /command  ·  [Shift+Enter] / [Ctrl+J] newline");
+    ? (placeholder ?? "…waiting for response…")
+    : (placeholder ?? placeholderActive);
 
   const lines = value.length > 0 ? value.split("\n") : [""];
-  const borderColor = disabled ? "gray" : "cyan";
+  const accentColor = disabled ? "gray" : "cyan";
+  // Static bar + static cursor. Earlier versions flowed the bar
+  // gradient and blinked the cursor via the global ticker; both
+  // drove per-tick re-renders that interleaved badly with terminal
+  // resize (Ink's eraseLines miscounts logical vs visual rows on
+  // wrap, ghost frames stack). The bar still gets a gradient — just
+  // a fixed sweep based on row index, no time component.
+  const barColorAt = (rowIdx: number): string =>
+    disabled ? "gray" : GRADIENT[((rowIdx % GRADIENT.length) + GRADIENT.length) % GRADIENT.length]!;
+  const cursorVisible = true;
   const { line: cursorLine, col: cursorCol } = lineAndColumn(value, cursor);
 
+  // Big-buffer mitigation: if the buffer has many logical lines,
+  // collapse middle rows so Ink isn't redrawing 500+ rows per
+  // keystroke.
+  const renderItems = collapseLinesForDisplay(lines, cursorLine);
+  const showHugeBufferHints = lines.length > 20;
+
   return (
-    <Box borderStyle="round" borderColor={borderColor} paddingX={1} flexDirection="column">
-      {lines.map((line, i) => {
-        const isFirst = i === 0;
-        const showPlaceholder = isFirst && value.length === 0;
-        const isCursorLine = i === cursorLine;
-        return (
-          // biome-ignore lint/suspicious/noArrayIndexKey: stable by construction — lines are derived from `value.split("\n")` and never reordered
-          <Box key={i}>
-            {isFirst ? (
-              <Text bold color={borderColor}>
-                you ›{" "}
+    <Box flexDirection="column" paddingX={1}>
+      {renderItems.map((item, renderIdx) => {
+        if (item.kind === "skip") {
+          return (
+            // biome-ignore lint/suspicious/noArrayIndexKey: stable — collapse markers derive from a fixed sliding window
+            <Box key={`skip-${renderIdx}`}>
+              <Text color={barColorAt(renderIdx)}>{BAR}</Text>
+              <Text dimColor>{continuationIndent.slice(BAR.length)}</Text>
+              <Text dimColor>
+                {`[… ${item.linesHidden} line${item.linesHidden === 1 ? "" : "s"} hidden — full content kept, submitted on Enter …]`}
               </Text>
-            ) : (
-              <Text dimColor>{"     "}</Text>
-            )}
-            {showPlaceholder ? (
-              <>
-                {isCursorLine && !disabled ? (
-                  <Text color={borderColor}>{showCursor ? "▌" : " "}</Text>
-                ) : null}
-                <Text dimColor>{effectivePlaceholder}</Text>
-              </>
-            ) : isCursorLine && !disabled ? (
-              <LineWithCursor
-                line={line}
-                col={cursorCol}
-                showCursor={showCursor}
-                borderColor={borderColor}
-              />
-            ) : (
-              <Text>{line}</Text>
-            )}
-          </Box>
+            </Box>
+          );
+        }
+        const i = item.originalIndex;
+        const line = item.line;
+        const isFirst = i === 0;
+        const isCursorLine = i === cursorLine;
+        const showPlaceholder = isFirst && value.length === 0;
+        return (
+          <PromptLine
+            key={`ln-${i}`}
+            line={line}
+            isFirst={isFirst}
+            isCursorLine={isCursorLine && !disabled}
+            cursorCol={isCursorLine ? cursorCol : null}
+            cursorVisible={cursorVisible}
+            showPlaceholder={showPlaceholder}
+            placeholderText={effectivePlaceholder}
+            promptPrefix={promptPrefix}
+            continuationIndent={continuationIndent}
+            visibleCells={visibleCells}
+            accentColor={accentColor}
+            barColor={barColorAt(i)}
+            pastes={pastesRef.current}
+            disabled={disabled === true}
+          />
         );
       })}
+      {showHugeBufferHints && !disabled ? (
+        <Box>
+          <Text color={barColorAt(0)}>{BAR}</Text>
+          <Text dimColor>{continuationIndent.slice(BAR.length)}</Text>
+          <Text dimColor>
+            {`[${lines.length} lines · PageUp/PageDown jump to top/bottom · Ctrl+U clear · Ctrl+W del word]`}
+          </Text>
+        </Box>
+      ) : null}
+      {!disabled && !narrow && value.length > 0 && !value.includes("\n") ? (
+        <Box>
+          <Text color={barColorAt(0)}>{BAR}</Text>
+          <Text dimColor>{continuationIndent.slice(BAR.length)}</Text>
+          <Text dimColor>
+            [Ctrl+J] newline · [Enter] submit · ends with \ for line continuation
+          </Text>
+        </Box>
+      ) : null}
+      {!disabled && !narrow && value.length === 0 ? (
+        <Box>
+          <Text color={barColorAt(0)}>{BAR}</Text>
+          <Text dimColor>{continuationIndent.slice(BAR.length)}</Text>
+          <Text dimColor>
+            [PgUp/PgDn] scroll log · [End] jump to latest · drag to select · auto-scrolls at edge
+          </Text>
+        </Box>
+      ) : null}
+      {disabled ? (
+        <Box>
+          <Text color={barColorAt(0)}>{BAR}</Text>
+          <Text dimColor>{continuationIndent.slice(BAR.length)}</Text>
+          <Text dimColor>[Esc] to stop</Text>
+        </Box>
+      ) : null}
     </Box>
   );
 }
 
-function LineWithCursor({
-  line,
-  col,
-  showCursor,
-  borderColor,
-}: {
+// ── PromptLine ────────────────────────────────────────────────────
+
+interface PromptLineProps {
   line: string;
-  col: number;
-  showCursor: boolean;
-  borderColor: "cyan" | "gray";
-}) {
-  const before = line.slice(0, col);
-  const atCursor = line.slice(col, col + 1);
-  const after = line.slice(col + 1);
-  if (atCursor.length === 0) {
-    // Cursor sits past the last char of this line (end-of-line). Render
-    // a trailing block so the user sees where they're typing next.
+  isFirst: boolean;
+  isCursorLine: boolean;
+  cursorCol: number | null;
+  /** True when the cursor block / inverse char should be drawn this tick. */
+  cursorVisible: boolean;
+  showPlaceholder: boolean;
+  placeholderText: string;
+  promptPrefix: string;
+  continuationIndent: string;
+  visibleCells: number;
+  accentColor: "cyan" | "gray";
+  /** Animated gradient color for the leading ▎ bar. Differs per row + tick. */
+  barColor: string;
+  pastes: ReadonlyMap<number, PasteEntry>;
+  disabled: boolean;
+}
+
+function PromptLine({
+  line,
+  isFirst,
+  isCursorLine,
+  cursorCol,
+  cursorVisible,
+  showPlaceholder,
+  placeholderText,
+  promptPrefix,
+  continuationIndent,
+  visibleCells,
+  accentColor,
+  barColor,
+  pastes,
+  disabled,
+}: PromptLineProps) {
+  // The leading BAR cells of every prefix/continuation are the left
+  // anchor bar — render them as a separate span colored by the
+  // animated gradient so the bar appears to flow vertically.
+  const barText = promptPrefix.slice(0, BAR.length);
+  const bodyPrefix = promptPrefix.slice(BAR.length);
+  const bodyContinuation = continuationIndent.slice(BAR.length);
+  if (showPlaceholder) {
     return (
-      <>
-        <Text>{before}</Text>
-        <Text color={borderColor}>{showCursor ? "▌" : " "}</Text>
-      </>
+      <Box>
+        <Text color={barColor}>{barText}</Text>
+        <Text bold color={accentColor}>
+          {bodyPrefix}
+        </Text>
+        {!disabled ? <Text color={accentColor}>{cursorVisible ? "▌" : " "}</Text> : null}
+        <Text dimColor>{placeholderText}</Text>
+      </Box>
     );
   }
+
+  const viewport = buildViewport(line, isCursorLine ? cursorCol : null, visibleCells, pastes);
+
+  // Render: prefix + (left marker?) + segments-with-cursor + (right marker?)
   return (
-    <>
-      <Text>{before}</Text>
-      <Text inverse={showCursor}>{atCursor}</Text>
-      <Text>{after}</Text>
-    </>
+    <Box>
+      <Text color={barColor}>{barText}</Text>
+      {isFirst ? (
+        <Text bold color={accentColor}>
+          {bodyPrefix}
+        </Text>
+      ) : (
+        <Text dimColor>{bodyContinuation}</Text>
+      )}
+      {viewport.hiddenLeft ? (
+        <Text color="gray" dimColor>
+          ‹
+        </Text>
+      ) : null}
+      <ViewportContent
+        segments={viewport.segments}
+        cursorCell={isCursorLine ? viewport.cursorCell : null}
+        accentColor={accentColor}
+        cursorVisible={cursorVisible}
+      />
+      {viewport.hiddenRight ? (
+        <Text color="gray" dimColor>
+          ›
+        </Text>
+      ) : null}
+    </Box>
   );
 }
+
+// ── ViewportContent ────────────────────────────────────────────────
+
+/**
+ * Render a viewport's segments with a cursor block at `cursorCell`.
+ * Walks segments in order; the cursor splits at most one segment
+ * (the one containing the cursor cell), producing an inverted char
+ * at that position.
+ *
+ * End-of-line cursor (cursorCell points past the last cell of the
+ * last segment): emit a trailing block.
+ */
+function ViewportContent({
+  segments,
+  cursorCell,
+  accentColor,
+  cursorVisible,
+}: {
+  segments: Segment[];
+  cursorCell: number | null;
+  accentColor: "cyan" | "gray";
+  cursorVisible: boolean;
+}) {
+  // No cursor on this line — straight render.
+  if (cursorCell === null) {
+    return <>{segments.map((seg, i) => renderSegment(seg, i, false))}</>;
+  }
+
+  // Walk segments tallying cells; once we reach `cursorCell`, split
+  // the segment to insert the cursor block.
+  const out: React.ReactNode[] = [];
+  let cells = 0;
+  let placed = false;
+  for (let i = 0; i < segments.length; i++) {
+    const seg = segments[i]!;
+    const segCells = segmentCells(seg);
+    if (placed) {
+      out.push(renderSegment(seg, i, false));
+      continue;
+    }
+    if (cursorCell >= cells + segCells) {
+      // Cursor isn't in this segment.
+      out.push(renderSegment(seg, i, false));
+      cells += segCells;
+      continue;
+    }
+    // Cursor lands inside this segment.
+    if (seg.kind === "paste") {
+      // The cursor is "on" the paste sentinel — render the paste
+      // block inversed so the user sees they're at it. Inverse
+      // toggles with the blink so the paste sentinel stays
+      // legible during the cursor's "off" half-cycle.
+      out.push(
+        <Text key={`p-${i}-cursor`} color="magenta" bold inverse={cursorVisible}>
+          {seg.label}
+        </Text>,
+      );
+      placed = true;
+      cells += segCells;
+      continue;
+    }
+    // text segment — split before/at-cursor/after by cell offset.
+    const offsetIntoSeg = cursorCell - cells;
+    const split = splitTextByCells(seg.text, offsetIntoSeg);
+    if (split.before.length > 0) {
+      out.push(<Text key={`t-${i}-b`}>{split.before}</Text>);
+    }
+    if (split.atCursor.length > 0) {
+      out.push(
+        <Text key={`t-${i}-c`} inverse={cursorVisible} color={accentColor}>
+          {split.atCursor}
+        </Text>,
+      );
+    } else {
+      // Cursor sits past the segment's last char (end-of-text in this
+      // segment). Render block here, blinking with the tick.
+      out.push(
+        <Text key={`t-${i}-c-eol`} color={accentColor}>
+          {cursorVisible ? "▌" : " "}
+        </Text>,
+      );
+    }
+    if (split.after.length > 0) {
+      out.push(<Text key={`t-${i}-a`}>{split.after}</Text>);
+    }
+    placed = true;
+    cells += segCells;
+  }
+
+  // Cursor sits past every segment (end of line).
+  if (!placed) {
+    out.push(
+      <Text key="cursor-eol" color={accentColor}>
+        {cursorVisible ? "▌" : " "}
+      </Text>,
+    );
+  }
+
+  return <>{out}</>;
+}
+
+function segmentCells(seg: Segment): number {
+  if (seg.kind === "paste") return seg.label.length;
+  return stringCells(seg.text);
+}
+
+/**
+ * Split a text string at a cell offset, returning the chars before
+ * the offset, the char AT the offset (the cursor block highlights
+ * it), and the chars after. A wide char that straddles the offset
+ * is treated as the cursor's char.
+ */
+function splitTextByCells(
+  text: string,
+  cellOffset: number,
+): { before: string; atCursor: string; after: string } {
+  let cells = 0;
+  for (let i = 0; i < text.length; i++) {
+    const ch = text[i]!;
+    const cw = charCellsForText(ch);
+    if (cells === cellOffset) {
+      return { before: text.slice(0, i), atCursor: ch, after: text.slice(i + 1) };
+    }
+    if (cells + cw > cellOffset) {
+      // The wide char straddles the offset — show it as the cursor char.
+      return { before: text.slice(0, i), atCursor: ch, after: text.slice(i + 1) };
+    }
+    cells += cw;
+  }
+  // Cursor at end of text.
+  return { before: text, atCursor: "", after: "" };
+}
+
+/**
+ * Local cell-counting helper — duplicates `charCells` from
+ * prompt-viewport but inlined to avoid a back-and-forth import (this
+ * function is hot per-keystroke). Keep in sync.
+ */
+function charCellsForText(ch: string): number {
+  const code = ch.charCodeAt(0);
+  if (code < 0x20 || code === 0x7f) return 0;
+  if (code < 0x1100) return 1;
+  if (code >= 0x1100 && code <= 0x115f) return 2;
+  if (code >= 0x2e80 && code <= 0x303e) return 2;
+  if (code >= 0x3041 && code <= 0x33ff) return 2;
+  if (code >= 0x3400 && code <= 0x4dbf) return 2;
+  if (code >= 0x4e00 && code <= 0x9fff) return 2;
+  if (code >= 0xa000 && code <= 0xa4cf) return 2;
+  if (code >= 0xac00 && code <= 0xd7a3) return 2;
+  if (code >= 0xf900 && code <= 0xfaff) return 2;
+  if (code >= 0xfe30 && code <= 0xfe4f) return 2;
+  if (code >= 0xff00 && code <= 0xff60) return 2;
+  if (code >= 0xffe0 && code <= 0xffe6) return 2;
+  return 1;
+}
+
+function renderSegment(seg: Segment, key: number, _inverse: boolean): React.ReactNode {
+  if (seg.kind === "text") {
+    return <Text key={`s-${key}`}>{seg.text}</Text>;
+  }
+  // Paste sentinels render as a fuchsia bg-pill so they're visually
+  // distinct from typed text — the user can see "this is the
+  // collapsed paste, not 47 lines of code I typed". Matches the
+  // bg-pill idiom used elsewhere (mode bars, tool names).
+  return (
+    <Text key={`s-${key}`} backgroundColor="#f0abfc" color="black" bold>
+      {seg.label}
+    </Text>
+  );
+}
+
+// ── collapse helper (preserved from v1) ────────────────────────────
+
+type RenderItem =
+  | { kind: "line"; line: string; originalIndex: number }
+  | { kind: "skip"; linesHidden: number };
+
+const COLLAPSE_THRESHOLD = 20;
+const COLLAPSE_HEAD_LINES = 3;
+const COLLAPSE_TAIL_LINES = 2;
+
+export function collapseLinesForDisplay(lines: string[], cursorLine: number): RenderItem[] {
+  if (lines.length <= COLLAPSE_THRESHOLD) {
+    return lines.map((line, i) => ({ kind: "line" as const, line, originalIndex: i }));
+  }
+  const keep = new Set<number>();
+  for (let i = 0; i < COLLAPSE_HEAD_LINES && i < lines.length; i++) keep.add(i);
+  for (let i = Math.max(0, lines.length - COLLAPSE_TAIL_LINES); i < lines.length; i++) keep.add(i);
+  if (cursorLine >= 0 && cursorLine < lines.length) keep.add(cursorLine);
+  const sorted = [...keep].sort((a, b) => a - b);
+  const out: RenderItem[] = [];
+  let prev = -1;
+  for (const idx of sorted) {
+    if (idx - prev > 1) {
+      out.push({ kind: "skip", linesHidden: idx - prev - 1 });
+    }
+    out.push({ kind: "line", line: lines[idx] ?? "", originalIndex: idx });
+    prev = idx;
+  }
+  return out;
+}

src/cli/ui/RecordView.tsx

@@ -10,7 +10,7 @@
 
 import { Box, Text } from "ink";
 import React from "react";
-import type { TranscriptRecord } from "../../transcript.js";
+import type { TranscriptRecord } from "../../transcript/log.js";
 import { PlanStateBlock } from "./PlanStateBlock.js";
 
 export interface RecordViewProps {
@@ -28,12 +28,18 @@ export function RecordView({ rec, compact = false }: RecordViewProps) {
   const toolContentMax = compact ? 200 : 400;
 
   if (rec.role === "user") {
+    // Continuation indent of 6 spaces matches the `you › ` prefix width
+    // so wrapped multi-line user messages align under the body text
+    // instead of jumping to column 0.
+    const content = rec.content.includes("\n")
+      ? rec.content.split("\n").join("\n      ")
+      : rec.content;
     return (
       <Box marginTop={1}>
         <Text bold color="cyan">
           you ›{" "}
         </Text>
-        <Text>{rec.content}</Text>
+        <Text>{content}</Text>
       </Box>
     );
   }

src/cli/ui/ReplayApp.tsx

@@ -10,8 +10,8 @@
 
 import { Box, Static, Text, useApp, useInput } from "ink";
 import React, { useMemo, useState } from "react";
-import { type TurnPage, computeCumulativeStats } from "../../replay.js";
-import type { TranscriptMeta } from "../../transcript.js";
+import type { TranscriptMeta } from "../../transcript/log.js";
+import { type TurnPage, computeCumulativeStats } from "../../transcript/replay.js";
 import { RecordView } from "./RecordView.js";
 import { StatsPanel } from "./StatsPanel.js";
 
@@ -59,6 +59,7 @@ export function ReplayApp({ meta, pages }: ReplayAppProps) {
     cacheHitRatio: cumStats.cacheHitRatio,
     // Replay is read-only — no live last-turn prompt tokens to show.
     lastPromptTokens: 0,
+    lastTurnCostUsd: 0,
   };
 
   const prefixHash =
@@ -74,11 +75,7 @@ export function ReplayApp({ meta, pages }: ReplayAppProps) {
 
   return (
     <Box flexDirection="column">
-      <StatsPanel
-        summary={summary}
-        model={cumStats.models[0] ?? meta?.model ?? "?"}
-        prefixHash={prefixHash}
-      />
+      <StatsPanel summary={summary} />
 
       <Box flexDirection="column" marginTop={1} paddingX={1}>
         <Box justifyContent="space-between">

src/cli/ui/Select.tsx

@@ -9,8 +9,10 @@
  * rendering quirk bundled (`ink-text-input`); adding more is low value.
  */
 
-import { Box, Text, useInput } from "ink";
+import { Box, Text } from "ink";
 import React, { useState } from "react";
+import { useKeystroke } from "./keystroke-context.js";
+import { COLOR } from "./theme.js";
 
 export interface SelectItem<V extends string = string> {
   /** Stable identifier — returned to caller on submit. */
@@ -21,19 +23,16 @@ export interface SelectItem<V extends string = string> {
   hint?: string;
   /** If true, item is not selectable (rendered dimmed, skipped on nav). */
   disabled?: boolean;
+  /** Tab on this item starts inline-edit; typed text is forwarded as `onSubmit`'s 2nd arg. */
+  denyWithContext?: boolean;
 }
 
 export interface SingleSelectProps<V extends string> {
   items: SelectItem<V>[];
   initialValue?: V;
-  onSubmit: (value: V) => void;
+  onSubmit: (value: V, context?: string) => void;
   onCancel?: () => void;
-  /**
-   * Optional footer rendered dim beneath the list, e.g.
-   * `"↑/↓ navigate · Enter select · Esc cancel"`. Makes keyboard
-   * affordances discoverable — otherwise new users hit `y`/`n` and
-   * wonder why nothing happens.
-   */
+  /** Optional dim footer beneath the list — e.g. "[↑↓] navigate · [Enter] select · [Esc] cancel". */
   footer?: string;
 }
 
@@ -49,33 +48,83 @@ export function SingleSelect<V extends string>({
     items.findIndex((i) => i.value === initialValue && !i.disabled),
   );
   const [index, setIndex] = useState(initialIndex === -1 ? 0 : initialIndex);
+  const [editingContext, setEditingContext] = useState<string | null>(null);
+  const activeItem = items[index];
+  const isEditing = editingContext !== null;
 
-  useInput((_input, key) => {
-    if (key.upArrow) {
+  useKeystroke((ev) => {
+    if (isEditing) {
+      if (ev.paste) {
+        setEditingContext((v) => (v ?? "") + ev.input);
+        return;
+      }
+      if (ev.escape) {
+        setEditingContext(null);
+      } else if (ev.upArrow || ev.downArrow) {
+        setEditingContext(null);
+        setIndex((i) => findNextEnabled(items, i, ev.upArrow ? -1 : +1));
+      } else if (ev.return) {
+        const chosen = items[index];
+        if (chosen && !chosen.disabled) {
+          const ctx = editingContext || undefined;
+          setEditingContext(null);
+          onSubmit(chosen.value, ctx);
+        }
+      } else if (ev.backspace) {
+        setEditingContext((v) => (v ?? "").slice(0, -1));
+      } else if (ev.tab) {
+        setEditingContext((v) => `${v ?? ""}, `);
+      } else if (ev.input) {
+        setEditingContext((v) => (v ?? "") + ev.input);
+      }
+      return;
+    }
+
+    if (ev.paste) return;
+
+    if (ev.upArrow) {
       setIndex((i) => findNextEnabled(items, i, -1));
-    } else if (key.downArrow) {
+    } else if (ev.downArrow) {
       setIndex((i) => findNextEnabled(items, i, +1));
-    } else if (key.return) {
+    } else if (ev.tab && activeItem?.denyWithContext) {
+      setEditingContext("");
+    } else if (ev.return) {
       const chosen = items[index];
       if (chosen && !chosen.disabled) onSubmit(chosen.value);
-    } else if (key.escape && onCancel) {
+    } else if (ev.escape && onCancel) {
       onCancel();
     }
   });
 
+  const canDenyWithContext = activeItem?.denyWithContext;
+  const resolvedFooter = (() => {
+    if (isEditing) return "[Enter] confirm · [Esc] cancel · [↑↓] change option";
+    return (
+      footer ??
+      (canDenyWithContext
+        ? "[↑↓] navigate · [Enter] select · [Tab] add context · [Esc] cancel"
+        : undefined)
+    );
+  })();
+
   return (
     <Box flexDirection="column">
-      {items.map((item, i) => (
-        <SelectRow
-          key={item.value}
-          item={item}
-          active={i === index}
-          marker={i === index ? "▸" : " "}
-        />
-      ))}
-      {footer ? (
+      {items.map((item, i) => {
+        const showEditing = i === index && isEditing;
+        const displayLabel = showEditing ? `${item.label}, ${editingContext}` : item.label;
+        return (
+          <SelectRow
+            key={item.value}
+            item={{ ...item, label: displayLabel }}
+            active={i === index}
+            marker={i === index ? "▸" : " "}
+            showInlineCursor={showEditing}
+          />
+        );
+      })}
+      {resolvedFooter ? (
         <Box marginTop={1}>
-          <Text dimColor>{footer}</Text>
+          <Text dimColor>{resolvedFooter}</Text>
         </Box>
       ) : null}
     </Box>
@@ -87,7 +136,7 @@ export interface MultiSelectProps<V extends string> {
   initialSelected?: V[];
   onSubmit: (values: V[]) => void;
   onCancel?: () => void;
-  /** Footer hint under the list — e.g. "space toggle · enter confirm". */
+  /** Footer hint under the list — e.g. "[Space] toggle · [Enter] confirm". */
   footer?: string;
 }
 
@@ -104,12 +153,13 @@ export function MultiSelect<V extends string>({
   });
   const [selected, setSelected] = useState<Set<V>>(new Set(initialSelected));
 
-  useInput((input, key) => {
-    if (key.upArrow) {
+  useKeystroke((ev) => {
+    if (ev.paste) return;
+    if (ev.upArrow) {
       setIndex((i) => findNextEnabled(items, i, -1));
-    } else if (key.downArrow) {
+    } else if (ev.downArrow) {
       setIndex((i) => findNextEnabled(items, i, +1));
-    } else if (input === " ") {
+    } else if (ev.input === " ") {
       const item = items[index];
       if (!item || item.disabled) return;
       setSelected((prev) => {
@@ -118,13 +168,13 @@ export function MultiSelect<V extends string>({
         else next.add(item.value);
         return next;
       });
-    } else if (key.return) {
+    } else if (ev.return) {
       // Preserve catalog order rather than insertion order, so reruns
       // produce the same spec list for the same checkbox set — makes the
       // `config.json` diff trivially stable.
       const ordered = items.filter((i) => selected.has(i.value)).map((i) => i.value);
       onSubmit(ordered);
-    } else if (key.escape && onCancel) {
+    } else if (ev.escape && onCancel) {
       onCancel();
     }
   });
@@ -158,18 +208,28 @@ function SelectRow<V extends string>({
   item,
   active,
   marker,
+  showInlineCursor = false,
 }: {
   item: SelectItem<V>;
   active: boolean;
   marker: string;
+  showInlineCursor?: boolean;
 }) {
-  const color = item.disabled ? "gray" : active ? "cyan" : undefined;
+  // Color: dim for disabled, primary cyan + bold for active, plain
+  // default for inactive. Keeps the active-row affordance consistent
+  // with the slash + at-mention pickers (▸ + colored text).
+  const color = item.disabled ? COLOR.info : active ? COLOR.primary : undefined;
   return (
     <Box flexDirection="column">
       <Box>
-        <Text color={color}>
+        <Text color={color} bold={active} dimColor={item.disabled}>
           {marker} {item.label}
         </Text>
+        {showInlineCursor ? (
+          <Text backgroundColor="#67e8f9" color="black">
+            {" "}
+          </Text>
+        ) : null}
       </Box>
       {item.hint ? (
         <Box paddingLeft={marker.length + 1}>

src/cli/ui/SessionPicker.tsx

@@ -1,6 +1,7 @@
 import { Box, Text } from "ink";
 import React from "react";
 import { SingleSelect } from "./Select.js";
+import { COLOR, GLYPH } from "./theme.js";
 
 export type SessionChoice = "resume" | "new" | "delete";
 
@@ -12,6 +13,15 @@ export interface SessionPickerProps {
   onChoose: (choice: SessionChoice) => void;
 }
 
+/**
+ * Resume / new / delete picker shown at launch when a prior session
+ * file exists. Three lines of header (brand mark · session summary)
+ * then the selector, then a footer with key bindings.
+ *
+ * Visual grammar matches the design's session-resume modal: brand
+ * glyph in primary color, session name highlighted, the rest dim.
+ * No solid-bg pills — bracket-text style continues.
+ */
 export function SessionPicker({
   sessionName,
   messageCount,
@@ -21,9 +31,14 @@ export function SessionPicker({
   return (
     <Box flexDirection="column" marginY={1}>
       <Box marginBottom={1}>
-        <Text bold color="cyan">
-          {`Session "${sessionName}" has ${messageCount} prior message${messageCount === 1 ? "" : "s"}`}
+        <Text color={COLOR.brand} bold>
+          {GLYPH.brand}
         </Text>
+        <Text>{"  "}</Text>
+        <Text color={COLOR.primary} bold>
+          {`"${sessionName}"`}
+        </Text>
+        <Text dimColor>{` has ${messageCount} prior message${messageCount === 1 ? "" : "s"}`}</Text>
         <Text dimColor>{` · last active ${relativeTime(lastActive)}`}</Text>
       </Box>
       <SingleSelect
@@ -48,7 +63,7 @@ export function SessionPicker({
         onSubmit={(v) => onChoose(v as SessionChoice)}
       />
       <Box marginTop={1}>
-        <Text dimColor>↑↓ to move · Enter to pick</Text>
+        <Text dimColor>{"  ↑↓ navigate · ⏎ select"}</Text>
       </Box>
     </Box>
   );

src/cli/ui/Setup.tsx

@@ -2,6 +2,7 @@ import { Box, Text, useApp } from "ink";
 import TextInput from "ink-text-input";
 import React, { useState } from "react";
 import { defaultConfigPath, isPlausibleKey, redactKey, saveApiKey } from "../../config.js";
+import { COLOR, GLYPH, GRADIENT } from "./theme.js";
 
 export interface SetupProps {
   onReady: (apiKey: string) => void;
@@ -33,18 +34,34 @@ export function Setup({ onReady }: SetupProps) {
   };
 
   return (
-    <Box flexDirection="column" borderStyle="round" borderColor="cyan" paddingX={1}>
-      <Text bold color="cyan">
-        Welcome to Reasonix.
-      </Text>
-      <Box marginTop={1}>
-        <Text>Paste your DeepSeek API key to get started.</Text>
+    <Box flexDirection="column" paddingX={1} marginY={1}>
+      <Box>
+        <Text bold color={GRADIENT[0]}>
+          {GLYPH.brand}
+        </Text>
+        <Text>{"  "}</Text>
+        <Text bold>Welcome to </Text>
+        <Text bold color={GRADIENT[2]}>
+          REASONIX
+        </Text>
       </Box>
-      <Text dimColor>Get one (free credit on signup): https://platform.deepseek.com/api_keys</Text>
-      <Text dimColor>Saved locally to {defaultConfigPath()}</Text>
       <Box marginTop={1}>
-        <Text bold color="cyan">
-          {"key › "}
+        <Text color={COLOR.info}>Paste your DeepSeek API key to get started.</Text>
+      </Box>
+      <Box>
+        <Text dimColor>{"  free credit on signup · "}</Text>
+        <Text color={COLOR.primary}>https://platform.deepseek.com/api_keys</Text>
+      </Box>
+      <Box>
+        <Text dimColor>{"  saved to "}</Text>
+        <Text dimColor>{defaultConfigPath()}</Text>
+      </Box>
+      <Box marginTop={1}>
+        <Text bold color={COLOR.brand}>
+          {GLYPH.bar}
+        </Text>
+        <Text bold color={COLOR.primary}>
+          {" › "}
         </Text>
         <TextInput
           value={value}
@@ -56,15 +73,18 @@ export function Setup({ onReady }: SetupProps) {
       </Box>
       {error ? (
         <Box marginTop={1}>
-          <Text color="red">{error}</Text>
+          <Text color={COLOR.err} bold>
+            {GLYPH.err}
+          </Text>
+          <Text color={COLOR.err}>{`  ${error}`}</Text>
         </Box>
       ) : value ? (
         <Box marginTop={1}>
-          <Text dimColor>preview: {redactKey(value)}</Text>
+          <Text dimColor>{`  preview · ${redactKey(value)}`}</Text>
         </Box>
       ) : null}
       <Box marginTop={1}>
-        <Text dimColor>(Type /exit to abort.)</Text>
+        <Text dimColor>{"  /exit to abort"}</Text>
       </Box>
     </Box>
   );

src/cli/ui/ShellConfirm.tsx

@@ -1,6 +1,8 @@
 import { Box, Text } from "ink";
 import React from "react";
+import { ModalCard } from "./ModalCard.js";
 import { SingleSelect } from "./Select.js";
+import { COLOR } from "./theme.js";
 
 export type ShellConfirmChoice = "run_once" | "always_allow" | "deny";
 
@@ -11,7 +13,14 @@ export interface ShellConfirmProps {
    * "always allow". Typically the first 1-2 tokens of `command`.
    */
   allowPrefix: string;
-  onChoose: (choice: ShellConfirmChoice) => void;
+  /**
+   * Which tool is asking. `run_background` spawns via JobRegistry and
+   * returns early; `run_command` (default) blocks until the process
+   * exits. Shown as a hint in the modal so the user knows whether
+   * approving will block the TUI or not.
+   */
+  kind?: "run_command" | "run_background";
+  onChoose: (choice: ShellConfirmChoice, denyContext?: string) => void;
 }
 
 /**
@@ -23,53 +32,58 @@ export interface ShellConfirmProps {
  *      auto-runs.
  *   3. Deny — tell the model the user refused.
  * Arrow keys + Enter. No y/n hotkey — too easy to trigger by accident
- * when the user was mid-typing a response.
+ * when the user was mid-typing a response. Tab on Deny opens inline
+ * context entry, returned as `onChoose`'s 2nd arg.
  */
-export function ShellConfirm({ command, allowPrefix, onChoose }: ShellConfirmProps) {
+export function ShellConfirm({ command, allowPrefix, kind, onChoose }: ShellConfirmProps) {
+  const isBackground = kind === "run_background";
+  const subtitle = isBackground
+    ? "long-running process — keeps running after approval, /kill to stop"
+    : "model wants to run a shell command";
+
+  const denyItem = {
+    value: "deny" as const,
+    label: "Deny",
+    hint: "Not what you wanted? Press Tab to append `,` and tell the model what to do instead.",
+    denyWithContext: true as const,
+  };
+
   return (
-    <Box flexDirection="column" borderStyle="round" borderColor="yellow" paddingX={1} marginY={1}>
-      <Box>
-        <Text bold color="yellow">
-          ▸ model wants to run a shell command
+    <ModalCard
+      accent={COLOR.err}
+      icon={isBackground ? "⏱" : "⚡"}
+      title={isBackground ? "background process" : "shell command"}
+      subtitle={subtitle}
+    >
+      <Box marginBottom={1}>
+        <Text color={COLOR.primary} bold>
+          {"$ "}
         </Text>
+        <Text bold>{command}</Text>
       </Box>
-      <Box>
-        <Text color="yellow" dimColor>
-          {"──────────────────────────────────────────"}
-        </Text>
-      </Box>
-      <Box marginTop={1}>
-        <Text>
-          <Text dimColor>{"$ "}</Text>
-          <Text color="cyan">{command}</Text>
-        </Text>
-      </Box>
-      <Box marginTop={1}>
-        <SingleSelect
-          initialValue="run_once"
-          items={[
-            {
-              value: "run_once",
-              label: "Run once",
-              hint: "Execute this command, don't remember it.",
-            },
-            {
-              value: "always_allow",
-              label: `Always allow "${allowPrefix}" in this project`,
-              hint: "Save the prefix to ~/.reasonix/config.json; future matches auto-run.",
-            },
-            {
-              value: "deny",
-              label: "Deny",
-              hint: "Tell the model the user refused; it will continue without this command.",
-            },
-          ]}
-          onSubmit={(v) => onChoose(v as ShellConfirmChoice)}
-          onCancel={() => onChoose("deny")}
-          footer="[↑↓] navigate  ·  [Enter] select  ·  [Esc] deny"
-        />
-      </Box>
-    </Box>
+      <SingleSelect
+        initialValue="run_once"
+        items={[
+          {
+            value: "run_once",
+            label: "Run once",
+            hint: "Execute this command, don't remember it.",
+          },
+          {
+            value: "always_allow",
+            label: `Always allow "${allowPrefix}" in this project`,
+            hint: "Save the prefix to ~/.reasonix/config.json; future matches auto-run.",
+          },
+          denyItem,
+        ]}
+        onSubmit={(v, ctx) => {
+          if (v === "deny") onChoose("deny", ctx);
+          else onChoose(v as ShellConfirmChoice);
+        }}
+        onCancel={() => onChoose("deny")}
+        footer="[↑↓] navigate  ·  [Enter] select  ·  [Tab] add context  ·  [Esc] deny"
+      />
+    </ModalCard>
   );
 }
 

src/cli/ui/SlashArgPicker.tsx

@@ -2,6 +2,7 @@ import { Box, Text } from "ink";
 // biome-ignore lint/style/useImportType: tsconfig.jsx = "react" needs React in value scope for JSX compilation
 import React from "react";
 import type { SlashCommandSpec } from "./slash.js";
+import { COLOR, GLYPH } from "./theme.js";
 
 export interface SlashArgPickerProps {
   /**
@@ -36,15 +37,28 @@ export function SlashArgPicker({
   kind,
   partial,
 }: SlashArgPickerProps): React.ReactElement | null {
-  // Hint mode: a single dim row explaining the argsHint + summary.
+  // Header row shared by both hint and picker modes — same shape so
+  // the UI looks like the same affordance, just with or without rows
+  // beneath. cmd in accent violet (matches SlashSuggestions), argsHint
+  // in dim, summary in info.
+  const headerRow = (
+    <Box>
+      <Text color={COLOR.accent} bold>
+        {"/ "}
+      </Text>
+      <Text color={COLOR.accent} bold>
+        {`/${spec.cmd}`}
+      </Text>
+      {spec.argsHint ? <Text dimColor>{` ${spec.argsHint}`}</Text> : null}
+      <Text dimColor>{`  ${spec.summary}`}</Text>
+    </Box>
+  );
+
+  // Hint mode: header only.
   if (kind === "hint") {
     return (
-      <Box paddingX={1}>
-        <Text dimColor>
-          {"  "}
-          <Text bold>/{spec.cmd}</Text>
-          {spec.argsHint ? ` ${spec.argsHint}` : ""} — {spec.summary}
-        </Text>
+      <Box paddingX={1} marginTop={1}>
+        {headerRow}
       </Box>
     );
   }
@@ -52,13 +66,15 @@ export function SlashArgPicker({
   if (matches === null) return null;
   if (matches.length === 0) {
     return (
-      <Box flexDirection="column" paddingX={1}>
-        <Text dimColor>
-          {"  "}
-          <Text bold>/{spec.cmd}</Text>
-          {spec.argsHint ? ` ${spec.argsHint}` : ""} — {spec.summary}
-        </Text>
-        <Text color="yellow"> no match for "{partial}" — keep typing, or Backspace to edit</Text>
+      <Box flexDirection="column" paddingX={1} marginTop={1}>
+        {headerRow}
+        <Box>
+          <Text color={COLOR.warn} bold>
+            {GLYPH.warn}
+          </Text>
+          <Text color={COLOR.warn}>{` no match for "${partial}"`}</Text>
+          <Text dimColor>{" — keep typing, or Backspace to edit"}</Text>
+        </Box>
       </Box>
     );
   }
@@ -71,37 +87,28 @@ export function SlashArgPicker({
   const hiddenAbove = windowStart;
   const hiddenBelow = total - windowStart - shown.length;
   return (
-    <Box flexDirection="column" paddingX={1}>
-      <Text dimColor>
-        {"  "}
-        <Text bold>/{spec.cmd}</Text>
-        {spec.argsHint ? ` ${spec.argsHint}` : ""} — {spec.summary}
-      </Text>
-      {hiddenAbove > 0 ? <Text dimColor> ↑ {hiddenAbove} more above</Text> : null}
+    <Box flexDirection="column" paddingX={1} marginTop={1}>
+      {headerRow}
+      {hiddenAbove > 0 ? <Text dimColor>{`   ↑ ${hiddenAbove} above`}</Text> : null}
       {shown.map((value, i) => (
         <ArgRow key={value} value={value} isSelected={windowStart + i === selectedIndex} />
       ))}
-      {hiddenBelow > 0 ? <Text dimColor> ↓ {hiddenBelow} more below</Text> : null}
-      <Text dimColor> [↑↓] navigate · [Tab]/[Enter] pick</Text>
+      {hiddenBelow > 0 ? <Text dimColor>{`   ↓ ${hiddenBelow} below`}</Text> : null}
+      <Box marginTop={0}>
+        <Text dimColor>{"  ↑↓ navigate · Tab / ⏎ pick · esc cancel"}</Text>
+      </Box>
     </Box>
   );
 }
 
 function ArgRow({ value, isSelected }: { value: string; isSelected: boolean }) {
-  const marker = isSelected ? "▸" : " ";
-  if (isSelected) {
-    return (
-      <Box>
-        <Text bold color="cyan">
-          {marker} {value}
-        </Text>
-      </Box>
-    );
-  }
   return (
     <Box>
-      <Text dimColor>
-        {marker} {value}
+      <Text color={isSelected ? COLOR.primary : COLOR.info} bold={isSelected}>
+        {isSelected ? `${GLYPH.cur} ` : "  "}
+      </Text>
+      <Text color={isSelected ? COLOR.user : COLOR.info} bold={isSelected} dimColor={!isSelected}>
+        {value}
       </Text>
     </Box>
   );

src/cli/ui/SlashSuggestions.tsx

@@ -2,6 +2,7 @@ import { Box, Text } from "ink";
 // biome-ignore lint/style/useImportType: tsconfig.jsx = "react" needs React in value scope for JSX compilation
 import React from "react";
 import type { SlashCommandSpec } from "./slash.js";
+import { COLOR, GLYPH } from "./theme.js";
 
 export interface SlashSuggestionsProps {
   /**
@@ -15,11 +16,21 @@ export interface SlashSuggestionsProps {
 }
 
 /**
- * Floating slash-command panel. Rendered below the input box when
- * the user is typing a `/…` prefix. Navigation state lives in the
- * parent (App.tsx owns `slashSelected`) so ↑/↓/Tab/Enter stay
- * consistent with the useInput handler. This component is pure
- * display: `matches` and `selectedIndex` come in, rows go out.
+ * Slash-command palette. Rendered below the input box while the user
+ * is typing a `/…` prefix. Visual grammar matches the design doc's
+ * picker style:
+ *
+ *      / suggestions                                   esc cancel
+ *      ▸ /checkpoint   [name]    snapshot the workspace
+ *        /restore      <name>    roll back files to a checkpoint
+ *        /diff                   cumulative diff vs session start
+ *      [↑↓] navigate · [Tab/⏎] pick
+ *
+ * Cmd tokens render in accent violet (one consistent color for "this
+ * is a command"), descriptions in dim info color. The selected row
+ * gets a leading ▸ + bold cmd; non-selected rows get a 2-space pad in
+ * the same column so the cmd column stays aligned. No solid-bg pill —
+ * the bracket-text pattern from the chrome carries through here.
  */
 export function SlashSuggestions({
   matches,
@@ -28,9 +39,13 @@ export function SlashSuggestions({
   if (matches === null) return null;
   if (matches.length === 0) {
     return (
-      <Box paddingX={1}>
-        <Text color="yellow">no slash command matches that prefix</Text>
-        <Text dimColor> — Backspace to edit, or /help for the full list</Text>
+      <Box paddingX={1} marginTop={1}>
+        <Text color={COLOR.warn} bold>
+          {GLYPH.warn}
+        </Text>
+        <Text> </Text>
+        <Text color={COLOR.warn}>no slash command matches that prefix</Text>
+        <Text dimColor>{" — Backspace to edit, or /help for the full list"}</Text>
       </Box>
     );
   }
@@ -45,40 +60,40 @@ export function SlashSuggestions({
   const hiddenAbove = windowStart;
   const hiddenBelow = total - windowStart - shown.length;
   return (
-    <Box flexDirection="column" paddingX={1}>
-      {hiddenAbove > 0 ? <Text dimColor> ↑ {hiddenAbove} more above</Text> : null}
+    <Box flexDirection="column" paddingX={1} marginTop={1}>
+      <Box>
+        <Text color={COLOR.accent} bold>
+          {"/ "}
+        </Text>
+        <Text dimColor>{`${total} command${total === 1 ? "" : "s"}`}</Text>
+        {hiddenAbove > 0 ? <Text dimColor>{`   ↑ ${hiddenAbove} above`}</Text> : null}
+      </Box>
       {shown.map((spec, i) => (
         <SuggestionRow key={spec.cmd} spec={spec} isSelected={windowStart + i === selectedIndex} />
       ))}
-      {hiddenBelow > 0 ? <Text dimColor> ↓ {hiddenBelow} more below</Text> : null}
-      <Text dimColor> [↑↓] navigate · [Tab]/[Enter] pick</Text>
+      {hiddenBelow > 0 ? <Text dimColor>{`   ↓ ${hiddenBelow} below`}</Text> : null}
+      <Box marginTop={0}>
+        <Text dimColor>{"  ↑↓ navigate · Tab / ⏎ pick · esc cancel"}</Text>
+      </Box>
     </Box>
   );
 }
 
 function SuggestionRow({ spec, isSelected }: { spec: SlashCommandSpec; isSelected: boolean }) {
-  const marker = isSelected ? "▸" : " ";
   const name = `/${spec.cmd}`;
-  const argsSuffix = spec.argsHint ? ` ${spec.argsHint}` : "";
-  // Selected row gets full cyan coloring so it pops out against the
-  // dimmed others — mirrors the style GitHub Issues / Discord use
-  // for focused dropdown rows.
-  if (isSelected) {
-    return (
-      <Box>
-        <Text bold color="cyan">
-          {marker} {name.padEnd(12)}
-          {argsSuffix.padEnd(16)}
-        </Text>
-        <Text color="cyan"> {spec.summary}</Text>
-      </Box>
-    );
-  }
+  const argsSuffix = spec.argsHint ? spec.argsHint : "";
   return (
     <Box>
-      <Text dimColor>
-        {marker} {name.padEnd(12)}
-        {argsSuffix.padEnd(16)} {spec.summary}
+      <Text color={isSelected ? COLOR.primary : COLOR.info} bold={isSelected}>
+        {isSelected ? `${GLYPH.cur} ` : "  "}
+      </Text>
+      <Text color={COLOR.accent} bold={isSelected}>
+        {name.padEnd(14)}
+      </Text>
+      <Text dimColor>{argsSuffix.padEnd(14)}</Text>
+      <Text>{"  "}</Text>
+      <Text color={isSelected ? COLOR.user : COLOR.info} dimColor={!isSelected}>
+        {spec.summary}
       </Text>
     </Box>
   );

src/cli/ui/SplitDiff.tsx

@@ -0,0 +1,108 @@
+/**
+ * Side-by-side diff renderer — git-difftool / delta-style "old | new"
+ * layout. Each row shows the same logical position on both sides;
+ * removed lines have content on the left only with a red wash, added
+ * lines on the right with a green wash, common context appears on
+ * both sides dim.
+ *
+ * Layout:
+ *
+ *   40   function loginUser(...)        │ 40   function loginUser(...)
+ *   41 - if (!email) throw new Error… │ 41 + if (!email || typeof email…
+ *                                      │ 42 +   throw new TypeError(…)
+ *                                      │ 43 + }
+ *   42   return verify(email, …)        │ 44   return verify(email, …)
+ *
+ * Width is derived from the terminal — half each side minus a 3-cell
+ * separator (` │ `). Long lines truncate with `…` rather than wrap,
+ * so the row count stays predictable for the parent's height budget.
+ */
+
+import { Box, Text, useStdout } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for React.Fragment
+import React from "react";
+import type { SplitDiffRow } from "../../code/diff-preview.js";
+import { COLOR } from "./theme.js";
+
+export interface SplitDiffProps {
+  rows: readonly SplitDiffRow[];
+  /**
+   * Total columns budget. Defaults to terminal width. Modal callers
+   * pass a smaller number so the diff fits inside the modal frame.
+   */
+  totalCols?: number;
+}
+
+export function SplitDiff({ rows, totalCols }: SplitDiffProps): React.ReactElement {
+  const { stdout } = useStdout();
+  const cols = totalCols ?? stdout?.columns ?? 80;
+  // Reserve ~6 cells for outer border + padding on the modal/log side,
+  // 3 cells for the ` │ ` separator. Half the rest per column.
+  const innerCols = Math.max(40, cols - 6);
+  const halfCols = Math.floor((innerCols - 3) / 2);
+  return (
+    <Box flexDirection="column">
+      {rows.map((row, i) => (
+        <Box key={`r-${i}-${row.left.num ?? "p"}-${row.right.num ?? "p"}`}>
+          <Cell side={row.left} width={halfCols} which="left" />
+          <Text color={COLOR.info} dimColor>
+            {" │ "}
+          </Text>
+          <Cell side={row.right} width={halfCols} which="right" />
+        </Box>
+      ))}
+    </Box>
+  );
+}
+
+function Cell({
+  side,
+  width,
+  which,
+}: {
+  side: SplitDiffRow["left"] | SplitDiffRow["right"];
+  width: number;
+  which: "left" | "right";
+}) {
+  const numPad = 4; // up to 9999 lines
+  const sgnPad = 1; // single-char sign
+  const inner = Math.max(8, width - numPad - sgnPad - 2 /* spaces */);
+
+  const numStr = side.num !== null ? String(side.num).padStart(numPad) : " ".repeat(numPad);
+  const sign =
+    side.kind === "del" ? "-" : side.kind === "add" ? "+" : side.kind === "pad" ? " " : " ";
+  const raw = side.text;
+  const truncated = raw.length > inner ? `${raw.slice(0, inner - 1)}…` : raw;
+  // Pad to fixed width so the bg color stretches across the whole
+  // column even when the text is short — without this the red/green
+  // wash would only cover the actual chars and the rest of the row
+  // would be terminal default, which looks broken.
+  const padded = truncated.padEnd(inner);
+
+  if (side.kind === "del") {
+    return (
+      <Text color="#fbc8c8" backgroundColor="#2a1212">
+        {`${numStr} ${sign} ${padded}`}
+      </Text>
+    );
+  }
+  if (side.kind === "add") {
+    return (
+      <Text color="#bef0c8" backgroundColor="#0c2718">
+        {`${numStr} ${sign} ${padded}`}
+      </Text>
+    );
+  }
+  if (side.kind === "pad") {
+    // Empty side — mute everything, no bg, no glyph. The "… more
+    // lines" capRows marker also rides this kind on the left side
+    // when present, so we render its text dim italic.
+    return (
+      <Text color={COLOR.info} dimColor italic={!!raw}>
+        {`${numStr} ${sign} ${padded}`}
+      </Text>
+    );
+  }
+  // ctx: same content both sides, dim
+  return <Text dimColor>{`${numStr} ${sign} ${padded}`}</Text>;
+}

src/cli/ui/StatsPanel.tsx

@@ -1,445 +1,254 @@
+import { basename } from "node:path";
 import { Box, Text, useStdout } from "ink";
 import React from "react";
-import { DEEPSEEK_CONTEXT_TOKENS, DEFAULT_CONTEXT_TOKENS } from "../../telemetry.js";
-import type { SessionSummary } from "../../telemetry.js";
-import { VERSION } from "../../version.js";
-import { useTick } from "./ticker.js";
+import stringWidth from "string-width";
+import type { EditMode } from "../../config.js";
+import type { SessionSummary } from "../../telemetry/stats.js";
+import { Bar, ChromeRule } from "./primitives.js";
+import { COLOR, GRADIENT } from "./theme.js";
 
-/**
- * Cyan → blue → purple truecolor gradient for the REASONIX wordmark.
- * Each char gets its own hex color — terminals that support 24-bit
- * color (nearly all since 2016) render this as a smooth fade. Older
- * 256-color terminals snap to nearest; 8-color fall all the way back
- * to plain cyan via Ink's color pipeline, so the worst case is still
- * legible.
- */
-const WORDMARK_STYLES: ReadonlyArray<{ ch: string; color: string; isLogo: boolean }> = [
-  { ch: "◈", color: "#5eead4", isLogo: true }, // teal — brand mark
-  { ch: " ", color: "#5eead4", isLogo: false },
-  { ch: "R", color: "#67e8f9", isLogo: false }, // cyan
-  { ch: "E", color: "#7dd3fc", isLogo: false }, // sky
-  { ch: "A", color: "#93c5fd", isLogo: false }, // blue
-  { ch: "S", color: "#a5b4fc", isLogo: false }, // indigo
-  { ch: "O", color: "#c4b5fd", isLogo: false }, // violet
-  { ch: "N", color: "#d8b4fe", isLogo: false }, // purple
-  { ch: "I", color: "#f0abfc", isLogo: false }, // fuchsia
-  { ch: "X", color: "#f0abfc", isLogo: false }, // fuchsia
-];
-
-/**
- * Gradient-filled, animated app wordmark. The `◈` brand mark breathes
- * (bold on/off) once every ~1.6s when idle, ~600ms when the model is
- * working, so a glance at the top of the screen tells you immediately
- * whether the app is doing something. Letters' keys use the char+color
- * pair (not an index) so React state attaches to the glyph itself;
- * fine because WORDMARK_STYLES never reorders.
- */
-function Wordmark({ busy }: { busy: boolean }) {
-  const tick = useTick();
-  // Slow pulse = 12 ticks (~1.4s). Busy pulse = 5 ticks (~600ms).
-  const period = busy ? 5 : 12;
-  const bright = Math.floor(tick / period) % 2 === 0;
-  return (
-    <Text>
-      {WORDMARK_STYLES.map((c) => (
-        <Text key={`${c.ch}-${c.color}`} color={c.color} bold={c.isLogo ? bright : true}>
-          {c.ch}
-        </Text>
-      ))}
-    </Text>
-  );
-}
+const COLD_START_TURNS = 3;
 
 export interface StatsPanelProps {
   summary: SessionSummary;
-  model: string;
-  prefixHash: string;
-  harvestOn?: boolean;
-  branchBudget?: number;
-  /**
-   * Current `reasoning_effort` cap. Shown as a green "· max" / yellow
-   * "· high" tag in the header so the user always sees which tier the
-   * next turn will use. Absent/undefined hides the tag (e.g. before
-   * the loop is constructed).
-   */
-  reasoningEffort?: "high" | "max";
-  /**
-   * True when `reasonix code` is currently running in read-only Plan
-   * Mode. Surfaced as a red "PLAN" tag in the panel header so the user
-   * can tell at a glance that edits are gated behind submit_plan +
-   * approval.
-   */
   planMode?: boolean;
-  /**
-   * Account balance fetched once at launch (and optionally refreshed
-   * per-turn by the TUI). `null` or absent hides the balance cell
-   * entirely — /user/balance failed or the user ran with `--no-config`.
-   * The top-up warning fires below 1.0 unit of whatever currency
-   * the endpoint reports so a Chinese user with CNY and a U.S. user
-   * with USD both see "getting low."
-   */
+  editMode?: EditMode;
   balance?: { currency: string; total: number } | null;
-  /**
-   * Published npm version newer than VERSION. Rendered as a yellow
-   * "· update: X" nudge in the panel header. `null` / `undefined`
-   * hides the nudge (offline launch, already up to date, or check
-   * still in flight).
-   */
   updateAvailable?: string | null;
-  /**
-   * True when the loop is currently mid-turn — drives the wordmark's
-   * "busy breathing" animation. Visual signal that the app is thinking,
-   * visible at a glance from anywhere on screen.
-   */
-  busy?: boolean;
+  proArmed?: boolean;
+  escalated?: boolean;
+  budgetUsd?: number | null;
+  rootDir?: string;
+  sessionName?: string | null;
 }
 
-/**
- * Terminal width under which we switch from one-line metrics to a
- * stacked layout. Below 120 cols the wide version wraps mid-number
- * and the parens ("in $X · out $Y") get split across lines — which
- * looks broken. Stacking costs one row but stays readable on every
- * SSH / split-pane case we've hit.
- */
-const NARROW_BREAKPOINT = 120;
-
-/**
- * Cache-hit ratio is always zero on turn 1 (there's literally no cache
- * to hit yet). Showing that as red "0.0%" is a false alarm — new users
- * read it as "something is broken." We suppress the gradient until a
- * few turns have landed; by turn 4 the cache has had time to warm up.
- */
-const COLD_START_TURNS = 3;
-
 export function StatsPanel({
   summary,
-  model,
-  prefixHash,
-  harvestOn,
-  branchBudget,
-  reasoningEffort,
   planMode,
+  editMode,
   balance,
   updateAvailable,
-  busy,
+  proArmed,
+  escalated,
+  budgetUsd,
+  rootDir,
+  sessionName,
 }: StatsPanelProps) {
-  const branchOn = (branchBudget ?? 1) > 1;
-  const ctxMax = DEEPSEEK_CONTEXT_TOKENS[model] ?? DEFAULT_CONTEXT_TOKENS;
-  const ctxRatio = summary.lastPromptTokens / ctxMax;
-  const { stdout } = useStdout();
-  const columns = stdout?.columns ?? 80;
-  const narrow = columns < NARROW_BREAKPOINT;
-
-  // Cold-start: first few turns render cache+cost muted so a 0.0% hit
-  // rate on turn 1 doesn't look like an error. Once the cache has
-  // actually had a chance to build, we flip to the live gradient.
   const coldStart = summary.turns <= COLD_START_TURNS;
-
   return (
-    <Box borderStyle="round" borderColor="cyan" flexDirection="column" paddingX={1}>
-      <Header
-        model={model}
-        prefixHash={prefixHash}
-        harvestOn={harvestOn}
-        branchOn={branchOn}
-        branchBudget={branchBudget ?? 1}
-        reasoningEffort={reasoningEffort}
+    <Box flexDirection="column" paddingX={1}>
+      <ChromeRow
+        editMode={editMode}
         planMode={planMode}
-        turns={summary.turns}
+        proArmed={proArmed ?? false}
+        escalated={escalated ?? false}
+        summary={summary}
+        coldStart={coldStart}
+        rootDir={rootDir}
+        sessionName={sessionName ?? null}
         updateAvailable={updateAvailable}
-        narrow={narrow}
-        busy={busy ?? false}
+        balance={balance ?? null}
       />
-      {narrow ? (
-        <StackedMetrics
-          summary={summary}
-          ctxRatio={ctxRatio}
-          ctxMax={ctxMax}
-          balance={balance}
-          coldStart={coldStart}
-        />
-      ) : (
-        <InlineMetrics
-          summary={summary}
-          ctxRatio={ctxRatio}
-          ctxMax={ctxMax}
-          balance={balance}
-          coldStart={coldStart}
-        />
-      )}
-    </Box>
-  );
-}
-
-function Header({
-  model,
-  prefixHash,
-  harvestOn,
-  branchOn,
-  branchBudget,
-  reasoningEffort,
-  planMode,
-  turns,
-  updateAvailable,
-  narrow,
-  busy,
-}: {
-  model: string;
-  prefixHash: string;
-  harvestOn?: boolean;
-  branchOn: boolean;
-  branchBudget: number;
-  reasoningEffort?: "high" | "max";
-  planMode?: boolean;
-  turns: number;
-  updateAvailable?: string | null;
-  narrow: boolean;
-  busy: boolean;
-}) {
-  return (
-    <Box justifyContent="space-between">
-      <Box>
-        <Wordmark busy={busy} />
-        <Text dimColor>{` v${VERSION}`}</Text>
-        <Text dimColor> · </Text>
-        <Text color="yellow">{model}</Text>
-        {narrow ? null : (
-          <>
-            <Text dimColor> · </Text>
-            <Text dimColor>{prefixHash}</Text>
-          </>
-        )}
-        {harvestOn ? <Text color="magenta"> · harvest</Text> : null}
-        {branchOn ? <Text color="blue"> · branch{branchBudget}</Text> : null}
-        {reasoningEffort === "max" ? <Text color="green"> · max</Text> : null}
-        {reasoningEffort === "high" ? <Text color="yellow"> · high</Text> : null}
-        {planMode ? (
-          <Text color="red" bold>
-            {" · PLAN"}
-          </Text>
-        ) : null}
-      </Box>
-      <Text>
-        {updateAvailable ? (
-          <Text color="yellow" bold>{`update: ${updateAvailable} · `}</Text>
-        ) : null}
-        <Text dimColor>{narrow ? `turn ${turns}` : `turn ${turns} · /help`}</Text>
-      </Text>
-    </Box>
-  );
-}
-
-/**
- * Wide-terminal layout (≥120 cols): single metrics row. Matches the
- * original panel, just with calmer spacing and the cold-start
- * treatment folded in.
- */
-function InlineMetrics({
-  summary,
-  ctxRatio,
-  ctxMax,
-  balance,
-  coldStart,
-}: {
-  summary: SessionSummary;
-  ctxRatio: number;
-  ctxMax: number;
-  balance?: { currency: string; total: number } | null;
-  coldStart: boolean;
-}) {
-  return (
-    <Box marginTop={1} gap={3}>
-      <ContextCell ratio={ctxRatio} promptTokens={summary.lastPromptTokens} ctxMax={ctxMax} />
-      <CacheCell hitRatio={summary.cacheHitRatio} coldStart={coldStart} turns={summary.turns} />
-      <CostCell summary={summary} coldStart={coldStart} />
-      {balance ? <BalanceCell balance={balance} /> : null}
-    </Box>
-  );
-}
-
-/**
- * Narrow-terminal layout (<120 cols): one metric per line, in priority
- * order (ctx → balance → cache → cost). Order matters because users
- * scanning a cramped terminal want "am I about to hit a wall?" answered
- * first; dollars spent comes later.
- */
-function StackedMetrics({
-  summary,
-  ctxRatio,
-  ctxMax,
-  balance,
-  coldStart,
-}: {
-  summary: SessionSummary;
-  ctxRatio: number;
-  ctxMax: number;
-  balance?: { currency: string; total: number } | null;
-  coldStart: boolean;
-}) {
-  return (
-    <Box marginTop={1} flexDirection="column">
-      <ContextCell
-        ratio={ctxRatio}
-        promptTokens={summary.lastPromptTokens}
-        ctxMax={ctxMax}
-        showBar
-      />
-      {balance ? <BalanceCell balance={balance} /> : null}
-      <CacheCell hitRatio={summary.cacheHitRatio} coldStart={coldStart} turns={summary.turns} />
-      <CostCell summary={summary} coldStart={coldStart} />
-    </Box>
-  );
-}
-
-function ContextCell({
-  ratio,
-  promptTokens,
-  ctxMax,
-  showBar,
-}: {
-  ratio: number;
-  promptTokens: number;
-  ctxMax: number;
-  showBar?: boolean;
-}) {
-  if (promptTokens === 0) {
-    return (
-      <Text>
-        <Text dimColor>ctx </Text>
-        <Text dimColor>— (no turns yet)</Text>
-      </Text>
-    );
-  }
-  const color = ratio >= 0.8 ? "red" : ratio >= 0.6 ? "yellow" : "green";
-  const pct = Math.round(ratio * 100);
-  return (
-    <Text>
-      <Text dimColor>ctx </Text>
-      {showBar ? <Bar ratio={ratio} color={color} /> : null}
-      {showBar ? <Text> </Text> : null}
-      <Text color={color} bold>
-        {formatTokens(promptTokens)}/{formatTokens(ctxMax)}
-      </Text>
-      <Text dimColor> ({pct}%)</Text>
-      {ratio >= 0.8 ? (
-        <Text color="red" bold>
-          {"  ·  /compact"}
-        </Text>
+      <ChromeRule />
+      {budgetUsd !== null && budgetUsd !== undefined ? (
+        <BudgetRow spent={summary.totalCostUsd} cap={budgetUsd} />
       ) : null}
-    </Text>
+    </Box>
   );
 }
 
-function CacheCell({
-  hitRatio,
-  coldStart,
-  turns,
-}: {
-  hitRatio: number;
-  coldStart: boolean;
-  turns: number;
-}) {
-  const pct = (hitRatio * 100).toFixed(1);
-  if (turns === 0) {
-    return (
-      <Text>
-        <Text dimColor>cache </Text>
-        <Text dimColor>—</Text>
-      </Text>
-    );
-  }
-  if (coldStart) {
-    return (
-      <Text>
-        <Text dimColor>cache </Text>
-        <Text dimColor>{pct}% </Text>
-        <Text dimColor italic>
-          (cold start)
-        </Text>
-      </Text>
-    );
-  }
-  const color = hitRatio >= 0.7 ? "green" : hitRatio >= 0.4 ? "yellow" : "red";
-  return (
-    <Text>
-      <Text dimColor>cache </Text>
-      <Text color={color} bold>
-        {pct}%
-      </Text>
-    </Text>
-  );
-}
-
-function CostCell({
+function ChromeRow({
+  editMode,
+  planMode,
+  proArmed,
+  escalated,
   summary,
   coldStart,
+  rootDir,
+  sessionName,
+  updateAvailable,
+  balance,
 }: {
+  editMode?: EditMode;
+  planMode?: boolean;
+  proArmed: boolean;
+  escalated: boolean;
   summary: SessionSummary;
   coldStart: boolean;
+  rootDir?: string;
+  sessionName?: string | null;
+  updateAvailable?: string | null;
+  balance?: { currency: string; total: number } | null;
 }) {
-  if (summary.turns === 0) {
-    return (
-      <Text>
-        <Text dimColor>cost </Text>
-        <Text dimColor>—</Text>
-      </Text>
-    );
-  }
-  // The first turn is unavoidably a cache-miss (nothing to hit),
-  // so the dollar figure is front-loaded. Muting it during the
-  // cold-start window keeps the "expensive first turn" from
-  // reading as "something is wrong."
-  const primaryColor = coldStart ? undefined : "green";
+  const modePill = pickModePill(planMode, editMode);
+  const proPill = escalated
+    ? { label: "⇧ pro", color: COLOR.err }
+    : proArmed
+      ? { label: "⇧ pro", color: COLOR.warn }
+      : null;
+  const projectName = rootDir ? basename(rootDir) : null;
+  const cachePct = Math.round(summary.cacheHitRatio * 100);
+  const cacheColor =
+    summary.cacheHitRatio >= 0.7 ? COLOR.ok : summary.cacheHitRatio >= 0.4 ? COLOR.warn : COLOR.err;
+  const balanceLabel = balance
+    ? `[w ${balance.currency === "USD" ? "$" : ""}${balance.total.toFixed(2)}${balance.currency !== "USD" ? ` ${balance.currency}` : ""}]`
+    : "";
+  const costLabel = `[$${summary.totalCostUsd.toFixed(4)}]`;
+  const cacheLabel = "[c ▰▰▰▰▰▰ 100%]";
+  const updateLabel = updateAvailable ? `↑ ${updateAvailable}` : "";
+
+  // Greedy width-aware fit. Layout (every gap = 2 cells, applied as suffix
+  // to update/mode/pro and as prefix to balance/cache):
+  //   [brand][·project][›session]<spacer>[update][mode][pro][cost][balance][cache]
+  // Always shown: brand, project (if rootDir), mode (if set), pro (if armed),
+  //               cost. These carve fixedLeft / fixedRight first.
+  // Optional, dropped greedy by priority: balance > cache > session > update.
+  // The flexbox spacer can shrink to 0, so no minimum reserve.
+  const { stdout } = useStdout();
+  const cols = (stdout?.columns ?? 80) - 2; // subtract paddingX={1} on both sides
+  const SEP_DOT = stringWidth("  ·  ");
+  const SEP_ARROW = stringWidth("  ›  ");
+  const GAP = 2;
+
+  const fixedLeft =
+    stringWidth("◈ reasonix") + (projectName ? SEP_DOT + stringWidth(projectName) : 0);
+  const modeW = modePill ? GAP + stringWidth(`[${modePill.label}]`) : 0;
+  const proW = proPill ? GAP + stringWidth(`[${proPill.label}]`) : 0;
+  const fixedRight = modeW + proW + stringWidth(costLabel);
+  let budget = cols - fixedLeft - fixedRight;
+
+  const balW = balance ? GAP + stringWidth(balanceLabel) : 0;
+  const cacheW = GAP + stringWidth(cacheLabel);
+  const sessionW = sessionName ? SEP_ARROW + stringWidth(sessionName) : 0;
+  const updateW = updateLabel ? GAP + stringWidth(updateLabel) : 0;
+
+  const showBalance = balW > 0 && budget >= balW;
+  if (showBalance) budget -= balW;
+  const showCache = budget >= cacheW;
+  if (showCache) budget -= cacheW;
+  const showSession = sessionW > 0 && budget >= sessionW;
+  if (showSession) budget -= sessionW;
+  const showUpdate = updateW > 0 && budget >= updateW;
+  if (showUpdate) budget -= updateW;
+
   return (
-    <Text>
-      <Text dimColor>cost </Text>
-      <Text color={primaryColor} bold={!coldStart} dimColor={coldStart}>
-        ${summary.totalCostUsd.toFixed(6)}
+    <Box>
+      <Text bold color={GRADIENT[0]}>
+        {"◈ "}
       </Text>
-      <Text dimColor>
-        {" (in "}${summary.totalInputCostUsd.toFixed(6)}
-        {" · out "}${summary.totalOutputCostUsd.toFixed(6)}
-        {")"}
+      <Text color={COLOR.brand} bold>
+        reasonix
       </Text>
-    </Text>
+      {projectName ? (
+        <>
+          <Text color={COLOR.info} dimColor>
+            {"  ·  "}
+          </Text>
+          <Text>{projectName}</Text>
+          {showSession && sessionName ? (
+            <>
+              <Text color={COLOR.info} dimColor>
+                {"  ›  "}
+              </Text>
+              <Text color={COLOR.info}>{sessionName}</Text>
+            </>
+          ) : null}
+        </>
+      ) : null}
+
+      <Box flexGrow={1} />
+
+      {showUpdate ? (
+        <>
+          <Text color={COLOR.warn} bold>
+            {updateLabel}
+          </Text>
+          <Text>{"  "}</Text>
+        </>
+      ) : null}
+      {modePill ? (
+        <>
+          <Text color={modePill.color} bold>
+            {`[${modePill.label}]`}
+          </Text>
+          <Text>{"  "}</Text>
+        </>
+      ) : null}
+      {proPill ? (
+        <>
+          <Text color={proPill.color} bold>
+            {`[${proPill.label}]`}
+          </Text>
+          <Text>{"  "}</Text>
+        </>
+      ) : null}
+      <Text
+        color={
+          summary.turns === 0 || coldStart ? COLOR.info : sessionCostColor(summary.totalCostUsd)
+        }
+        bold={summary.turns > 0 && !coldStart}
+        dimColor={summary.turns === 0 || coldStart}
+      >
+        {costLabel}
+      </Text>
+      {showBalance && balance ? (
+        <>
+          <Text>{"  "}</Text>
+          <Text color={balance.total < 1 ? COLOR.err : balance.total < 5 ? COLOR.warn : COLOR.ok}>
+            {balanceLabel}
+          </Text>
+        </>
+      ) : null}
+      {showCache ? (
+        <>
+          <Text>{"  "}</Text>
+          <Text dimColor>{"["}</Text>
+          <Text dimColor>{"c "}</Text>
+          <Bar
+            ratio={summary.cacheHitRatio}
+            color={coldStart ? COLOR.info : cacheColor}
+            cells={6}
+            dim={coldStart}
+          />
+          <Text> </Text>
+          <Text color={coldStart ? undefined : cacheColor} dimColor={coldStart}>
+            {coldStart && summary.turns === 0 ? "—" : `${cachePct}%`}
+          </Text>
+          <Text dimColor>{"]"}</Text>
+        </>
+      ) : null}
+    </Box>
   );
 }
 
-function BalanceCell({ balance }: { balance: { currency: string; total: number } }) {
-  const color = balance.total < 1 ? "red" : balance.total < 5 ? "yellow" : "green";
+function pickModePill(
+  planMode: boolean | undefined,
+  editMode: EditMode | undefined,
+): { label: string; color: string } | null {
+  if (planMode) return { label: "PLAN", color: COLOR.err };
+  if (editMode === "yolo") return { label: "yolo", color: COLOR.err };
+  if (editMode === "auto") return { label: "auto", color: COLOR.primary };
+  if (editMode === "review") return { label: "review", color: COLOR.info };
+  return null;
+}
+
+function BudgetRow({ spent, cap }: { spent: number; cap: number }) {
+  const pct = Math.max(0, (spent / cap) * 100);
+  const color = pct >= 100 ? "#f87171" : pct >= 80 ? "#fbbf24" : "#94a3b8";
   return (
-    <Text>
-      <Text dimColor>balance </Text>
-      <Text color={color} bold>
-        {balance.currency === "USD" ? "$" : ""}
-        {balance.total.toFixed(2)}
-        {balance.currency !== "USD" ? ` ${balance.currency}` : ""}
+    <Box>
+      <Text dimColor>{"  budget  "}</Text>
+      <Text color={color}>
+        {`$${spent.toFixed(4)} / $${cap.toFixed(2)}`}
+        <Text dimColor>{`  (${pct.toFixed(0)}%)`}</Text>
       </Text>
-    </Text>
+    </Box>
   );
 }
 
-/**
- * Unicode progress bar for the narrow layout's context cell. 10 cells
- * wide — narrow terminals are already cramped, and the bar is just a
- * visual cue for the percentage next to it, not the primary readout.
- */
-function Bar({ ratio, color }: { ratio: number; color: "green" | "yellow" | "red" }) {
-  const cells = 10;
-  const filled = Math.max(0, Math.min(cells, Math.round(ratio * cells)));
-  const bar = "█".repeat(filled) + "░".repeat(cells - filled);
-  return <Text color={color}>{bar}</Text>;
-}
-
-/**
- * Compact token formatter using binary K (÷1024): 1234 → "1.2K",
- * 131072 → "128K". Matches DeepSeek's marketing label of "128K context
- * length" — showing "131k" confused users (the actual limit is
- * 128×1024 = 131,072 tokens, but the doc consistently says "128K").
- * Uppercase K signals binary-K to anyone who notices.
- */
-function formatTokens(n: number): string {
-  if (n < 1024) return String(n);
-  const k = n / 1024;
-  return k >= 100 ? `${k.toFixed(0)}K` : `${k.toFixed(1)}K`;
+function sessionCostColor(cost: number): string | undefined {
+  if (cost <= 0) return undefined;
+  if (cost >= 5) return COLOR.err;
+  if (cost >= 0.5) return COLOR.warn;
+  return COLOR.ok;
 }

src/cli/ui/WelcomeBanner.tsx

@@ -0,0 +1,165 @@
+/**
+ * Welcome card on the empty session. The FIRST thing every user sees
+ * after launching `reasonix code` — must communicate brand identity,
+ * what to type next, and how to escape, all in the ~5 seconds before
+ * the user starts typing.
+ *
+ * Layout (matches design/tui-redesign-ink.html welcome state):
+ *
+ *                    ◈ R E A S O N I X
+ *
+ *      DeepSeek-native coding agent · cache-first · flash-first
+ *
+ *        /skill         invoke a stored playbook by name
+ *        @file          inline a file's contents in your message
+ *        /checkpoint    snapshot the workspace before a risky turn
+ *        /help          every slash command + keyboard shortcut
+ *
+ *              tip · ctrl+j newline · trailing \ continues
+ *
+ * Why the redesign: the previous version was a left-aligned hint list
+ * with a tiny `◈ welcome` row — functional but invisible as brand. The
+ * gradient wordmark is the one chance per launch to plant identity, so
+ * we make it large + centered + colored across all 8 brand-gradient
+ * stops. The tagline below answers "what is this?" in one line. Cards
+ * answer "what do I type?" — the only three things a new user actually
+ * needs to know in the first 5 seconds.
+ *
+ * Why no animation: an animated gradient pan was tried, but Ink's
+ * eraseLines miscounts on resize when wide rows reflow, leaving
+ * stale frames stacked. Static gradient renders identically and
+ * costs zero ticker subscriptions.
+ */
+
+import { Box, Text, useStdout } from "ink";
+import React from "react";
+import { COLOR, GRADIENT } from "./theme.js";
+
+export interface WelcomeBannerProps {
+  /** True when running `reasonix code`. Surfaces code-mode hints. */
+  inCodeMode?: boolean;
+  /**
+   * Live URL of the embedded dashboard, or null when it isn't running.
+   * Surfacing this in the welcome card is how users discover the web UI
+   * — the chrome pill version was unreliable across terminals, so the
+   * card became the canonical pointer.
+   */
+  dashboardUrl?: string | null;
+}
+
+const WORDMARK = "REASONIX";
+const TAGLINE_CHAT = "DeepSeek-native agent · cache-first · flash-first";
+const TAGLINE_CODE = "DeepSeek-native coding agent · cache-first · flash-first";
+
+interface QuickCard {
+  cmd: string;
+  desc: string;
+}
+
+const CARDS_CHAT: QuickCard[] = [
+  { cmd: "/help", desc: "every slash command + keyboard shortcut" },
+  { cmd: "/skill", desc: "invoke a stored playbook by name" },
+  { cmd: "/dashboard", desc: "open the embedded web UI (chat · stats · settings)" },
+  { cmd: "/preset pro", desc: "switch to v4-pro for hard reasoning tasks" },
+  { cmd: "/exit", desc: "quit the TUI (Ctrl+C twice also works)" },
+];
+
+const CARDS_CODE: QuickCard[] = [
+  { cmd: "@file", desc: "inline a file's contents in your message" },
+  { cmd: "!cmd", desc: "run shell — output is captured for context" },
+  { cmd: "/checkpoint", desc: "snapshot the workspace before a risky turn" },
+  { cmd: "/dashboard", desc: "open the embedded web UI (chat · files · stats · settings)" },
+  { cmd: "/help", desc: "every slash command + keyboard shortcut" },
+];
+
+export function WelcomeBanner({
+  inCodeMode,
+  dashboardUrl,
+}: WelcomeBannerProps): React.ReactElement {
+  const { stdout } = useStdout();
+  const cols = stdout?.columns ?? 80;
+  // Wordmark width: each letter + space between letters. With letter-
+  // spacing of 1 cell, "R E A S O N I X" is 8*2-1 = 15 cells, plus the
+  // brand mark "◈ " = 2 cells, total 17 cells. We center on the term
+  // width, capped to a sane minimum so very narrow terminals don't
+  // produce negative pad.
+  const wordmarkText = `◈ ${WORDMARK.split("").join(" ")}`;
+  const wordmarkWidth = wordmarkText.length;
+  const tagline = inCodeMode ? TAGLINE_CODE : TAGLINE_CHAT;
+  const cards = inCodeMode ? CARDS_CODE : CARDS_CHAT;
+
+  // Center column 1: pad-left to put wordmark at terminal center
+  const wordmarkPad = Math.max(0, Math.floor((cols - wordmarkWidth) / 2));
+  const taglinePad = Math.max(0, Math.floor((cols - tagline.length) / 2));
+  // Cards left-margin: align to a comfortable indent rather than
+  // center each row (keeps the cmd column aligned).
+  const cardsIndent = Math.max(2, Math.floor((cols - 60) / 2));
+  const tipText = "tip · ctrl+j newline · trailing \\ also continues";
+  const tipPad = Math.max(0, Math.floor((cols - tipText.length) / 2));
+
+  return (
+    <Box flexDirection="column" marginY={1}>
+      {/* Wordmark — gradient across the 8 letters of REASONIX. The
+          brand mark `◈` sits in the brand teal as the first stop, then
+          each letter steps through the gradient. Bold throughout for
+          weight; spacing keeps it from reading as a single dense word. */}
+      <Box>
+        <Text>{" ".repeat(wordmarkPad)}</Text>
+        <Text bold color={GRADIENT[0]}>
+          {"◈ "}
+        </Text>
+        {WORDMARK.split("").map((letter, i) => (
+          // Wordmark is fixed-string ("REASONIX") — letters are unique
+          // and the array never reorders, so per-letter key is stable.
+          <React.Fragment key={letter}>
+            <Text bold color={GRADIENT[i % GRADIENT.length]}>
+              {letter}
+            </Text>
+            {i < WORDMARK.length - 1 ? <Text> </Text> : null}
+          </React.Fragment>
+        ))}
+      </Box>
+
+      <Box marginTop={1}>
+        <Text>{" ".repeat(taglinePad)}</Text>
+        <Text color={COLOR.info}>{tagline}</Text>
+      </Box>
+
+      {/* Quick-start cards — cmd token in accent violet, desc dim.
+          Aligned in two columns so the eye can scan command names
+          without having to read each desc. */}
+      <Box flexDirection="column" marginTop={2}>
+        {cards.map((card) => (
+          <Box key={card.cmd}>
+            <Text>{" ".repeat(cardsIndent)}</Text>
+            <Text bold color={COLOR.accent}>
+              {card.cmd.padEnd(14)}
+            </Text>
+            <Text color={COLOR.info}>{card.desc}</Text>
+          </Box>
+        ))}
+      </Box>
+
+      {/* Live dashboard URL — printed once, centered, when the embedded
+          server is up. This is the canonical pointer to the web UI; the
+          chrome pill version was unreliable across terminals so we
+          surface the URL here (one-shot at launch) and let the user
+          re-fetch via `/dashboard` whenever the welcome card has
+          scrolled away. */}
+      {dashboardUrl ? (
+        <Box marginTop={2}>
+          <Text>{" ".repeat(Math.max(0, Math.floor((cols - (dashboardUrl.length + 9)) / 2)))}</Text>
+          <Text color={COLOR.brand} bold>
+            {"▸ web · "}
+          </Text>
+          <Text color={COLOR.accent}>{dashboardUrl}</Text>
+        </Box>
+      ) : null}
+
+      <Box marginTop={dashboardUrl ? 1 : 2}>
+        <Text>{" ".repeat(tipPad)}</Text>
+        <Text dimColor>{tipText}</Text>
+      </Box>
+    </Box>
+  );
+}

src/cli/ui/Wizard.tsx

@@ -59,7 +59,7 @@ export function Wizard({ onComplete, onCancel, existingApiKey, initial }: Wizard
   const [step, setStep] = useState<Step>(existingApiKey ? "preset" : "apiKey");
   const [data, setData] = useState<WizardData>({
     apiKey: existingApiKey ?? "",
-    preset: initial?.preset ?? "fast",
+    preset: initial?.preset ?? "auto",
     selectedCatalog: deriveInitialCatalog(initial?.mcp ?? []),
     catalogArgs: {},
   });
@@ -97,7 +97,7 @@ export function Wizard({ onComplete, onCancel, existingApiKey, initial }: Wizard
           }}
         />
         <Box marginTop={1}>
-          <Text dimColor>↑/↓ move · enter confirm · esc cancel</Text>
+          <Text dimColor>[↑↓] navigate · [Enter] confirm · [Esc] cancel</Text>
         </Box>
       </StepFrame>
     );
@@ -115,7 +115,7 @@ export function Wizard({ onComplete, onCancel, existingApiKey, initial }: Wizard
             const needsArgs = selected.some((name) => CATALOG_BY_NAME.get(name)?.userArgs);
             setStep(needsArgs ? "mcpArgs" : "review");
           }}
-          footer="↑/↓ move · space toggle · enter confirm · esc cancel · leave empty to skip"
+          footer="[↑↓] navigate  ·  [Space] toggle  ·  [Enter] confirm  ·  [Esc] cancel  ·  empty = skip"
         />
       </StepFrame>
     );
@@ -174,7 +174,7 @@ export function Wizard({ onComplete, onCancel, existingApiKey, initial }: Wizard
             </Box>
           ) : null}
           <Box marginTop={1}>
-            <Text dimColor>enter save · esc cancel</Text>
+            <Text dimColor>[Enter] save · [Esc] cancel</Text>
           </Box>
         </Box>
         <ReviewConfirm
@@ -213,7 +213,7 @@ export function Wizard({ onComplete, onCancel, existingApiKey, initial }: Wizard
         <Text>Run `reasonix` any time to start chatting — your settings are remembered.</Text>
       </Box>
       <Box marginTop={1}>
-        <Text dimColor>Press enter to exit.</Text>
+        <Text dimColor>[Enter] to exit</Text>
       </Box>
       <ExitOnEnter onExit={exit} />
     </Box>
@@ -386,8 +386,8 @@ function SummaryLine({ label, value }: { label: string; value: string }) {
 // ---------- data helpers ----------
 
 function presetItems(): SelectItem<PresetName>[] {
-  return (["fast", "smart", "max"] as PresetName[]).map((name) => ({
-    value: name,
+  return (["auto", "flash", "pro"] as const).map((name) => ({
+    value: name as PresetName,
     label: `${name} — ${PRESET_DESCRIPTIONS[name].headline}`,
     hint: PRESET_DESCRIPTIONS[name].cost,
   }));

src/cli/ui/WorkspaceConfirm.tsx

@@ -0,0 +1,73 @@
+import { Box, Text } from "ink";
+import React from "react";
+import { ModalCard } from "./ModalCard.js";
+import { SingleSelect } from "./Select.js";
+import { COLOR } from "./theme.js";
+
+export type WorkspaceConfirmChoice = "switch" | "deny";
+
+export interface WorkspaceConfirmProps {
+  /** Resolved absolute path the model wants to switch to. */
+  path: string;
+  /** Current session root, shown above the target so the user sees the diff. */
+  currentRoot: string;
+  /** Number of MCP servers still attached — surfaced so the user knows
+   * those won't follow the switch (their child processes were spawned
+   * with the original cwd). 0 means no warning. */
+  mcpServerCount: number;
+  onChoose: (choice: WorkspaceConfirmChoice, denyContext?: string) => void;
+}
+
+/**
+ * Modal-style approval for a `change_workspace` tool call. Two
+ * choices, Enter / Esc bindings. No "always allow" — workspace
+ * switches are per-target by nature. Tab on Deny opens inline
+ * context entry, returned as `onChoose`'s 2nd arg.
+ */
+export function WorkspaceConfirm({
+  path,
+  currentRoot,
+  mcpServerCount,
+  onChoose,
+}: WorkspaceConfirmProps) {
+  const subtitle =
+    mcpServerCount > 0
+      ? `MCP servers (${mcpServerCount}) stay anchored to the original launch root.`
+      : "Re-registers filesystem / shell / memory tools at the new path.";
+
+  return (
+    <ModalCard accent={COLOR.warn} icon="⇄" title="switch workspace" subtitle={subtitle}>
+      <Box flexDirection="column" marginBottom={1}>
+        <Box>
+          <Text dimColor>{"from  "}</Text>
+          <Text color={COLOR.info}>{currentRoot}</Text>
+        </Box>
+        <Box>
+          <Text dimColor>{"to    "}</Text>
+          <Text color={COLOR.primary} bold>
+            {path}
+          </Text>
+        </Box>
+      </Box>
+      <SingleSelect
+        initialValue="switch"
+        items={[
+          {
+            value: "switch",
+            label: "Switch",
+            hint: "Re-register filesystem / shell / memory tools against the new root.",
+          },
+          {
+            value: "deny",
+            label: "Deny",
+            hint: "Tell the model why you're refusing; it will continue without changing directories.",
+            denyWithContext: true,
+          },
+        ]}
+        onSubmit={(v, ctx) => onChoose(v as WorkspaceConfirmChoice, ctx)}
+        onCancel={() => onChoose("deny")}
+        footer="[↑↓] navigate  ·  [Enter] select  ·  [Tab] add context  ·  [Esc] deny"
+      />
+    </ModalCard>
+  );
+}

src/cli/ui/alt-screen.ts

@@ -0,0 +1,39 @@
+/** Alt-screen lifecycle — restore must be idempotent and run on SIGINT/SIGTERM/exit so the user's main buffer always comes back. */
+
+import { useEffect } from "react";
+
+function isInteractiveTty(): boolean {
+  return Boolean(process.stdout?.isTTY);
+}
+
+export function useAltScreen(): void {
+  useEffect(() => {
+    if (!isInteractiveTty()) return;
+    // 1002 = button-event tracking (press + drag + release); 1006 = SGR coords.
+    // Shift+drag bypasses tracking for native terminal selection.
+    process.stdout.write("\x1b[?1049h\x1b[2J\x1b[H\x1b[?1002h\x1b[?1006h");
+
+    let restored = false;
+    const restore = () => {
+      if (restored) return;
+      restored = true;
+      try {
+        process.stdout.write("\x1b[?1006l\x1b[?1002l\x1b[?1000l\x1b[?1049l");
+      } catch {
+        /* terminal closed */
+      }
+    };
+
+    process.once("exit", restore);
+    process.once("SIGINT", () => {
+      restore();
+      process.exit(130);
+    });
+    process.once("SIGTERM", () => {
+      restore();
+      process.exit(143);
+    });
+
+    return restore;
+  }, []);
+}

src/cli/ui/bang.ts

@@ -1,25 +1,5 @@
-/**
- * Bash-mode (`!cmd`) prefix parsing.
- *
- * A `!` at the start of the user's input means "run this as a shell
- * command in the sandbox root, and put both the command and its output
- * into the conversation so the model sees it next turn." Same idea as
- * Claude Code's `!` prefix — faster than round-tripping through the
- * model just to cat a file or check git status.
- *
- * Design choice: user-typed `!` commands skip the allowlist. The
- * allowlist exists to bound what the MODEL can do with run_command;
- * the user typing `!git push` by hand is explicit consent. If a user
- * wants stricter gating they can set `REASONIX_BANG_CONFIRM=1` in a
- * future iteration.
- */
+/** User-typed `!cmd` skips the allowlist — that gate is for the MODEL, not the user. */
 
-/**
- * Return the command portion of a `!`-prefixed input, or `null` if
- * the text isn't a bang invocation. Trims leading/trailing whitespace
- * from the command body. `!` alone (or `!` followed by only whitespace)
- * returns `null` — no command to run.
- */
 export function detectBangCommand(text: string): string | null {
   if (!text.startsWith("!")) return null;
   const body = text.slice(1).trim();
@@ -27,13 +7,6 @@ export function detectBangCommand(text: string): string | null {
   return body;
 }
 
-/**
- * Format a bang command + its output into a single user-role message
- * body that the model will see on the next turn. The `[!cmd]` header
- * marks the run explicitly so the model can distinguish
- * user-typed shell output from its own `run_command` tool results
- * (which are `role: tool`, different message shape entirely).
- */
 export function formatBangUserMessage(cmd: string, output: string): string {
   return `[!${cmd}]\n${output}`;
 }

src/cli/ui/char-bar.tsx

@@ -0,0 +1,118 @@
+/**
+ * Character-cell progress bar — the visual primitive shared across:
+ *   · cache hit ratio in the status bar
+ *   · undo banner countdown
+ *   · /context token-usage breakdown (stacked variant)
+ *   · plan step progress
+ *   · MCP progress notifications
+ *   · walk-through "block N of M" position
+ *
+ * Why one helper: in a TUI you can only convey "fraction" by character
+ * fill, not by gradient bg. Doing it ad-hoc per call site led to five
+ * subtly different bar styles (some used `█/░`, some `■/-`, some
+ * inverted bg). Centralizing here means the visual cue is one
+ * consistent thing the user reads at-a-glance everywhere.
+ *
+ * All variants render in 1 row, 1 cell tall. Width defaults to 24
+ * which is wide enough for "10% increments are visible to the eye"
+ * but narrow enough to fit beside other status info.
+ */
+
+import { Box, Text } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for JSX compilation
+import React from "react";
+import { COLOR, GLYPH } from "./theme.js";
+
+export interface CharBarProps {
+  /** 0–100 (clamped). Negative or NaN → 0; >100 → 100. */
+  pct: number;
+  /** Cell count. Default 24. Min 4 enforced so the bar is at least readable. */
+  width?: number;
+  /** Filled-cell color. Defaults to brand cyan. */
+  color?: string;
+  /** Empty-cell color. Defaults to dim slate. */
+  emptyColor?: string;
+  /**
+   * Whether to render the percentage label after the bar. Off when the
+   * caller wants to put its own meta after (e.g. "12 of 30 done").
+   */
+  showLabel?: boolean;
+  /** Optional label override (default: "{pct}%"). */
+  label?: string;
+}
+
+/**
+ * Single-color progress bar. Render shape:
+ *   `████████████░░░░░░░░░░░░  50%`
+ *
+ * Filled section is `█` in `color`, empty section is `░` in
+ * `emptyColor`. Label sits in the same row, dim by default.
+ */
+export function CharBar({
+  pct,
+  width = 24,
+  color = COLOR.primary,
+  emptyColor,
+  showLabel = true,
+  label,
+}: CharBarProps): React.ReactElement {
+  const total = Math.max(4, width);
+  const clamped = Math.max(0, Math.min(100, Number.isFinite(pct) ? pct : 0));
+  const filled = Math.round((total * clamped) / 100);
+  return (
+    <Box>
+      <Text color={color}>{GLYPH.block.repeat(filled)}</Text>
+      <Text color={emptyColor ?? COLOR.info} dimColor>
+        {GLYPH.shade1.repeat(total - filled)}
+      </Text>
+      {showLabel ? <Text dimColor>{`  ${label ?? `${Math.round(clamped)}%`}`}</Text> : null}
+    </Box>
+  );
+}
+
+export interface StackedSegment {
+  /** Percent of the total width this segment occupies. 0–100. */
+  pct: number;
+  color: string;
+  /** Optional label (used by legend renderer; not rendered in the bar). */
+  label?: string;
+}
+
+export interface StackedCharBarProps {
+  segments: readonly StackedSegment[];
+  width?: number;
+  /** Color of the trailing "free / unused" cells. */
+  emptyColor?: string;
+}
+
+/**
+ * Stacked progress bar. Multiple colored segments + a trailing empty
+ * region. Rendered left-to-right in segment order; if the segments'
+ * pcts sum >100 the trailing empty just becomes 0.
+ *
+ * Used by `/context` to break down system / tools / log / input
+ * occupancy across the prompt budget.
+ */
+export function StackedCharBar({
+  segments,
+  width = 32,
+  emptyColor,
+}: StackedCharBarProps): React.ReactElement {
+  const total = Math.max(4, width);
+  const cells = segments.map((s) => Math.max(0, Math.round((total * s.pct) / 100)));
+  const used = cells.reduce((acc, n) => acc + n, 0);
+  const empty = Math.max(0, total - used);
+  return (
+    <Box>
+      {segments.map((seg, i) => (
+        // biome-ignore lint/suspicious/noArrayIndexKey: ordered, fixed-shape
+        <Text key={`seg-${i}`} color={seg.color}>
+          {GLYPH.block.repeat(cells[i] ?? 0)}
+        </Text>
+      ))}
+      <Text color={emptyColor ?? COLOR.info} dimColor>
+        {GLYPH.shade1.repeat(empty)}
+      </Text>
+    </Box>
+  );
+}

src/cli/ui/clipboard.ts

@@ -0,0 +1,31 @@
+/** OSC 52 clipboard write + temp-file fallback. */
+
+import { writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+const OSC_52_LIMIT = 75_000;
+
+export interface ClipboardWrite {
+  osc52: boolean;
+  filePath: string | null;
+  size: number;
+}
+
+export function writeClipboard(text: string): ClipboardWrite {
+  const filePath = join(tmpdir(), `reasonix-clip-${Date.now()}.txt`);
+  let osc52 = false;
+  if (text.length <= OSC_52_LIMIT) {
+    const b64 = Buffer.from(text, "utf8").toString("base64");
+    process.stdout.write(`\x1b]52;c;${b64}\x1b\\`);
+    osc52 = true;
+  }
+  let writtenPath: string | null = null;
+  try {
+    writeFileSync(filePath, text, "utf8");
+    writtenPath = filePath;
+  } catch {
+    /* read-only fs */
+  }
+  return { osc52, filePath: writtenPath, size: text.length };
+}

src/cli/ui/ctx-breakdown.tsx

@@ -0,0 +1,152 @@
+import { Box, Text } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for JSX compilation
+import React from "react";
+import type { CacheFirstLoop } from "../../loop.js";
+import { DEEPSEEK_CONTEXT_TOKENS, DEFAULT_CONTEXT_TOKENS } from "../../telemetry/stats.js";
+import { countTokens } from "../../tokenizer.js";
+import { formatTokens } from "./primitives.js";
+import { COLOR } from "./theme.js";
+
+export interface CtxBreakdownData {
+  systemTokens: number;
+  toolsTokens: number;
+  logTokens: number;
+  inputTokens: number;
+  ctxMax: number;
+  toolsCount: number;
+  logMessages: number;
+  topTools: Array<{ name: string; tokens: number; turn: number }>;
+}
+
+/**
+ * Walk the loop's prefix + log and tally tokens per category. Cheap
+ * after the tokenizer warm-up (~100 ms first call, sub-ms after).
+ * Memoize at the call site if used inside a render path.
+ */
+export function computeCtxBreakdown(loop: CacheFirstLoop): CtxBreakdownData {
+  const systemTokens = countTokens(loop.prefix.system);
+  const toolsTokens = countTokens(JSON.stringify(loop.prefix.toolSpecs));
+  const entries = loop.log.toMessages();
+  let userTokens = 0;
+  let assistantTokens = 0;
+  let toolResultTokens = 0;
+  let toolCallTokens = 0;
+  const toolBreakdown: Array<{ name: string; tokens: number; turn: number }> = [];
+  let logTurn = 0;
+  for (const e of entries) {
+    const content = typeof e.content === "string" ? e.content : "";
+    if (e.role === "user") {
+      userTokens += countTokens(content);
+      logTurn += 1;
+    } else if (e.role === "assistant") {
+      assistantTokens += countTokens(content);
+      if (Array.isArray(e.tool_calls) && e.tool_calls.length > 0) {
+        toolCallTokens += countTokens(JSON.stringify(e.tool_calls));
+      }
+    } else if (e.role === "tool") {
+      const n = countTokens(content);
+      toolResultTokens += n;
+      toolBreakdown.push({ name: e.name ?? "?", tokens: n, turn: logTurn });
+    }
+  }
+  const logTokens = userTokens + assistantTokens + toolResultTokens + toolCallTokens;
+  const ctxMax = DEEPSEEK_CONTEXT_TOKENS[loop.model] ?? DEFAULT_CONTEXT_TOKENS;
+  const topTools = [...toolBreakdown].sort((a, b) => b.tokens - a.tokens).slice(0, 5);
+  return {
+    systemTokens,
+    toolsTokens,
+    logTokens,
+    inputTokens: 0,
+    ctxMax,
+    toolsCount: loop.prefix.toolSpecs.length,
+    logMessages: entries.length,
+    topTools,
+  };
+}
+
+/**
+ * 4-segment stacked bar with legend + top-tools list. Pushed to
+ * scrollback by the `/context` slash; the always-on bottom footer
+ * uses its own slim 1-row layout in `CtxFooter`.
+ */
+export function CtxBreakdownBlock({ data }: { data: CtxBreakdownData }): React.ReactElement {
+  const total = data.systemTokens + data.toolsTokens + data.logTokens + data.inputTokens;
+  const winPct = data.ctxMax > 0 ? Math.round((total / data.ctxMax) * 100) : 0;
+  const barWidth = 48;
+  const cellOf = (n: number) => (data.ctxMax > 0 ? Math.round((n / data.ctxMax) * barWidth) : 0);
+  const sysCells = cellOf(data.systemTokens);
+  const toolsCells = cellOf(data.toolsTokens);
+  const logCells = cellOf(data.logTokens);
+  const inputCells = cellOf(data.inputTokens);
+  const used = sysCells + toolsCells + logCells + inputCells;
+  const freeCells = Math.max(0, barWidth - used);
+  const sevColor = winPct >= 80 ? COLOR.err : winPct >= 60 ? COLOR.warn : COLOR.ok;
+
+  return (
+    <Box
+      flexDirection="column"
+      marginY={1}
+      borderStyle="single"
+      borderTop={false}
+      borderRight={false}
+      borderBottom={false}
+      borderColor={COLOR.brand}
+      paddingLeft={1}
+    >
+      <Box>
+        <Text color={COLOR.brand} bold>
+          ▣ context
+        </Text>
+        <Text dimColor>{`  ${formatTokens(total)} of ${formatTokens(data.ctxMax)}`}</Text>
+        <Text dimColor>{"  ·  "}</Text>
+        <Text color={sevColor} bold>
+          {`${winPct}%`}
+        </Text>
+        {winPct >= 80 ? (
+          <Text color={COLOR.err} bold>
+            {"  ·  /compact"}
+          </Text>
+        ) : null}
+      </Box>
+      <Box>
+        <Text color={COLOR.brand}>{"█".repeat(sysCells)}</Text>
+        <Text color={COLOR.accent}>{"█".repeat(toolsCells)}</Text>
+        <Text color={COLOR.primary}>{"█".repeat(logCells)}</Text>
+        <Text color={COLOR.tool}>{"█".repeat(inputCells)}</Text>
+        <Text color={COLOR.info} dimColor>
+          {"░".repeat(freeCells)}
+        </Text>
+      </Box>
+      <Box>
+        <Text color={COLOR.brand}>■</Text>
+        <Text dimColor>{` system ${formatTokens(data.systemTokens)}`}</Text>
+        <Text>{"   "}</Text>
+        <Text color={COLOR.accent}>■</Text>
+        <Text dimColor>{` tools ${formatTokens(data.toolsTokens)}`}</Text>
+        <Text dimColor>{` (${data.toolsCount})`}</Text>
+        <Text>{"   "}</Text>
+        <Text color={COLOR.primary}>■</Text>
+        <Text dimColor>{` log ${formatTokens(data.logTokens)}`}</Text>
+        <Text dimColor>{` (${data.logMessages} msg)`}</Text>
+        <Text>{"   "}</Text>
+        <Text color={COLOR.tool}>■</Text>
+        <Text dimColor>{` input ${formatTokens(data.inputTokens)}`}</Text>
+      </Box>
+      {data.topTools.length > 0 ? (
+        <Box marginTop={1} flexDirection="column">
+          <Text dimColor>{`  top tool results by cost (${data.topTools.length}):`}</Text>
+          {data.topTools.map((t) => (
+            <Box key={`${t.turn}-${t.name}`}>
+              <Text dimColor>{`    turn ${String(t.turn).padStart(3)}  `}</Text>
+              <Text color={COLOR.info}>{t.name.padEnd(22)}</Text>
+              <Text dimColor>{`  ${formatTokens(t.tokens).padStart(8)}`}</Text>
+            </Box>
+          ))}
+        </Box>
+      ) : null}
+      <Box marginTop={1}>
+        <Text dimColor>{"  /compact shrinks oversized tool results · /new wipes log"}</Text>
+      </Box>
+    </Box>
+  );
+}

src/cli/ui/edit-history.ts

@@ -0,0 +1,121 @@
+import { formatAllBlockDiffs } from "../../code/diff-preview.js";
+import type { ApplyResult, EditBlock, EditSnapshot } from "../../code/edit-blocks.js";
+
+/** Session-only — restoring pre-apply content across restarts is git's job, not ours. */
+export interface EditHistoryEntry {
+  /** Sequence number within the session, stable for `/show <id>`. */
+  id: number;
+  /** Epoch ms when the entry was opened (first edit landed). */
+  at: number;
+  /** Tag for what produced the batch — "auto" / "auto-text" / "review-apply". */
+  source: string;
+  /** Edit blocks included in this batch, in arrival order. */
+  blocks: EditBlock[];
+  /** Per-block outcome — some may be "not-found" if SEARCH drifted. */
+  results: ApplyResult[];
+  /** First-snapshot-per-path wins — multi-edit turns roll back to pre-turn state. */
+  snapshots: EditSnapshot[];
+  /** Per-path so a multi-file batch can be partially undone. */
+  undoneFiles: Set<string>;
+}
+
+/** True when every path in the entry has been undone. */
+export function isEntryFullyUndone(e: EditHistoryEntry): boolean {
+  return e.snapshots.length > 0 && e.snapshots.every((s) => e.undoneFiles.has(s.path));
+}
+
+/** Per-entry three-state status label for display. */
+export function entryStatus(e: EditHistoryEntry): "applied" | "UNDONE" | "PARTIAL" {
+  if (e.undoneFiles.size === 0) return "applied";
+  if (isEntryFullyUndone(e)) return "UNDONE";
+  return "PARTIAL";
+}
+
+/** Status prefix is `✓`/`✗` so the line reads without color (piped, screenshots). */
+export function formatEditResults(results: ApplyResult[]): string {
+  const lines = results.map((r) => {
+    const mark = r.status === "applied" || r.status === "created" ? "✓" : "✗";
+    const detail = r.message ? ` (${r.message})` : "";
+    return `  ${mark} ${r.status.padEnd(11)} ${r.path}${detail}`;
+  });
+  const ok = results.filter((r) => r.status === "applied" || r.status === "created").length;
+  const total = results.length;
+  const header = `▸ edit blocks: ${ok}/${total} applied — /undo to roll back, or \`git diff\` to review`;
+  return [header, ...lines].join("\n");
+}
+
+/** `[N]` labels so users can `/apply 1,3-4` instead of all-or-nothing. */
+export function formatPendingPreview(blocks: EditBlock[]): string {
+  const partial = blocks.length > 1 ? "  ·  /apply N or 1,3-4 for partial" : "";
+  const header = `▸ ${blocks.length} pending edit block(s) — /apply (or y) to commit · /discard (or n) to drop${partial}`;
+  const diffLines = formatAllBlockDiffs(blocks, { numbered: blocks.length > 1 });
+  return [header, ...diffLines].join("\n");
+}
+
+/** Empty input → `{ ok: [] }` so callers detect "no indices" → default to all-blocks. */
+export function parseEditIndices(raw: string, max: number): { ok: number[] } | { error: string } {
+  const trimmed = raw.trim();
+  if (!trimmed) return { ok: [] };
+  if (max <= 0) return { error: "no pending edits to address" };
+  const seen = new Set<number>();
+  const tokens = trimmed
+    .split(",")
+    .map((t) => t.trim())
+    .filter((t) => t.length > 0);
+  if (tokens.length === 0) return { ok: [] };
+  for (const tok of tokens) {
+    const range = tok.match(/^(\d+)-(\d+)$/);
+    if (range) {
+      const a = Number.parseInt(range[1] ?? "", 10);
+      const b = Number.parseInt(range[2] ?? "", 10);
+      if (!Number.isFinite(a) || !Number.isFinite(b) || a < 1 || b < 1) {
+        return { error: `invalid range: "${tok}"` };
+      }
+      const lo = Math.min(a, b);
+      const hi = Math.max(a, b);
+      if (hi > max) return { error: `index ${hi} out of range (max ${max})` };
+      for (let i = lo; i <= hi; i++) seen.add(i);
+      continue;
+    }
+    if (!/^\d+$/.test(tok)) return { error: `invalid index: "${tok}"` };
+    const n = Number.parseInt(tok, 10);
+    if (!Number.isFinite(n) || n < 1) return { error: `invalid index: "${tok}"` };
+    if (n > max) return { error: `index ${n} out of range (max ${max})` };
+    seen.add(n);
+  }
+  return { ok: [...seen].sort((a, b) => a - b) };
+}
+
+export function partitionEdits<T>(
+  edits: readonly T[],
+  indices1Based: readonly number[],
+): { selected: T[]; remaining: T[] } {
+  const picked = new Set(indices1Based);
+  const selected: T[] = [];
+  const remaining: T[] = [];
+  for (let i = 0; i < edits.length; i++) {
+    if (picked.has(i + 1)) selected.push(edits[i] as T);
+    else remaining.push(edits[i] as T);
+  }
+  return { selected, remaining };
+}
+
+export function formatUndoRows(results: ApplyResult[]): string[] {
+  return results.map((r) => {
+    const mark = r.status === "applied" ? "✓" : "✗";
+    const detail = r.message ? ` (${r.message})` : "";
+    return `  ${mark} ${r.path}${detail}`;
+  });
+}
+
+export function describeRepair(repair: {
+  scavenged: number;
+  truncationsFixed: number;
+  stormsBroken: number;
+}): string {
+  const parts: string[] = [];
+  if (repair.scavenged) parts.push(`scavenged ${repair.scavenged}`);
+  if (repair.truncationsFixed) parts.push(`repaired ${repair.truncationsFixed} truncation`);
+  if (repair.stormsBroken) parts.push(`broke ${repair.stormsBroken} storm`);
+  return parts.length ? `[repair] ${parts.join(", ")}` : "";
+}

src/cli/ui/frame-render.tsx

@@ -0,0 +1,18 @@
+import { Box, Text } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for JSX compilation
+import React from "react";
+import { type Frame, frameToAnsi } from "../../frame/index.js";
+
+/** Frame → JSX. One Box per row. */
+export function renderFrame(f: Frame, keyPrefix: string): React.ReactElement {
+  return (
+    <>
+      {f.rows.map((row, i) => (
+        // biome-ignore lint/suspicious/noArrayIndexKey: row index is the row's identity
+        <Box key={`${keyPrefix}/${i}`} height={1} flexShrink={0}>
+          <Text>{frameToAnsi({ width: f.width, rows: [row] })}</Text>
+        </Box>
+      ))}
+    </>
+  );
+}

src/cli/ui/hash-memory.ts

@@ -0,0 +1,96 @@
+/** `#` writes project memory, `#g` global; `##+` stays a markdown heading; `\#` escapes and submits the literal `#`. */
+
+import { appendFileSync, existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import { homedir } from "node:os";
+import { dirname, join } from "node:path";
+import { PROJECT_MEMORY_FILE } from "../../memory/project.js";
+
+const PROJECT_HEADER = `# Reasonix project memory
+
+Notes the user pinned via the \`#\` prompt prefix. The whole file is
+loaded into the immutable system prefix every session — keep it terse.
+
+`;
+
+const GLOBAL_HEADER = `# Reasonix global memory
+
+Cross-project notes the user pinned via the \`#g\` prompt prefix. Loaded
+into every Reasonix session's prefix regardless of working directory.
+Private to this machine — not committed anywhere.
+
+`;
+
+export type HashMemoryParse =
+  | { kind: "memory"; note: string }
+  | { kind: "memory-global"; note: string }
+  | { kind: "escape"; text: string };
+
+/** Order: escape > `##` heading > `#g <body>` (mandatory space) > `#<body>` project. */
+export function detectHashMemory(text: string): HashMemoryParse | null {
+  if (text.startsWith("\\#")) {
+    return { kind: "escape", text: text.slice(1) };
+  }
+  if (!text.startsWith("#")) return null;
+  // Markdown headings of level 2+ pass through to the model unchanged.
+  // Only a single leading `#` (level-1 heading shape) is ambiguous; we
+  // resolve that ambiguity in favor of memory write and document the
+  // `\#` escape for users who want a literal H1 in the prompt.
+  if (text.startsWith("##")) return null;
+  // `#g <note>` — global memory. The space after `g` is mandatory so
+  // notes like `#golang preference` route to project memory, not global.
+  // `#g` alone (or `#g` + only whitespace) is treated as null — the
+  // user clearly wanted the global form but typed no body, so we don't
+  // silently fall back to project memory with body=`g`.
+  if (/^#g\s*$/.test(text)) return null;
+  const globalMatch = /^#g\s+(.+)$/s.exec(text);
+  if (globalMatch) {
+    const body = globalMatch[1]!.trim();
+    if (!body) return null;
+    return { kind: "memory-global", note: body };
+  }
+  const body = text.slice(1).trim();
+  if (!body) return null;
+  return { kind: "memory", note: body };
+}
+
+export interface AppendMemoryResult {
+  /** Absolute path written to. */
+  path: string;
+  /** True iff the file did not exist before this call. */
+  created: boolean;
+}
+
+export function appendProjectMemory(rootDir: string, note: string): AppendMemoryResult {
+  return appendBulletToFile(join(rootDir, PROJECT_MEMORY_FILE), note, PROJECT_HEADER);
+}
+
+export const GLOBAL_MEMORY_DIR = ".reasonix";
+export const GLOBAL_MEMORY_FILE = "REASONIX.md";
+
+export function globalMemoryPath(homeDir: string = homedir()): string {
+  return join(homeDir, GLOBAL_MEMORY_DIR, GLOBAL_MEMORY_FILE);
+}
+
+export function appendGlobalMemory(note: string, homeDir?: string): AppendMemoryResult {
+  return appendBulletToFile(globalMemoryPath(homeDir), note, GLOBAL_HEADER);
+}
+
+function appendBulletToFile(path: string, note: string, newFileHeader: string): AppendMemoryResult {
+  const trimmed = note.trim();
+  if (!trimmed) throw new Error("note body cannot be empty");
+  const bullet = `- ${trimmed}\n`;
+  if (!existsSync(path)) {
+    mkdirSync(dirname(path), { recursive: true });
+    writeFileSync(path, `${newFileHeader}${bullet}`, "utf8");
+    return { path, created: true };
+  }
+  let prefix = "";
+  try {
+    const existing = readFileSync(path, "utf8");
+    if (existing.length > 0 && !existing.endsWith("\n")) prefix = "\n";
+  } catch {
+    // Unreadable but exists — let appendFileSync surface the real error.
+  }
+  appendFileSync(path, `${prefix}${bullet}`, "utf8");
+  return { path, created: false };
+}

src/cli/ui/key-normalize.ts

@@ -0,0 +1,73 @@
+/** CSI tail recovery for Ink useInput — Windows ConPTY splits `\x1b[A` across reads; we re-merge. */
+/** Only rewrites when no structured key flag is set AND input matches a known tail exactly. */
+
+/** Structured-flag subset of Ink's Key — optional across Ink versions. */
+export interface CsiKeyFlags {
+  upArrow?: boolean;
+  downArrow?: boolean;
+  leftArrow?: boolean;
+  rightArrow?: boolean;
+  pageUp?: boolean;
+  pageDown?: boolean;
+  delete?: boolean;
+  shift?: boolean;
+  tab?: boolean;
+}
+
+/** Bracketed-paste `[200~`/`[201~` excluded — handled by PromptInput's paste accumulator. */
+const CSI_TAIL_TO_FLAGS: ReadonlyArray<{ tail: string; flags: CsiKeyFlags }> = [
+  // Arrow keys — the most common ConPTY victim.
+  { tail: "[A", flags: { upArrow: true } },
+  { tail: "[B", flags: { downArrow: true } },
+  { tail: "[C", flags: { rightArrow: true } },
+  { tail: "[D", flags: { leftArrow: true } },
+  // Page navigation.
+  { tail: "[5~", flags: { pageUp: true } },
+  { tail: "[6~", flags: { pageDown: true } },
+  // Forward-delete (the key labelled Delete on most keyboards).
+  { tail: "[3~", flags: { delete: true } },
+  // Shift+Tab — terminal sends `\x1b[Z` rather than tab-with-shift.
+  { tail: "[Z", flags: { shift: true, tab: true } },
+];
+
+function alreadyStructured(flags: CsiKeyFlags): boolean {
+  return Boolean(
+    flags.upArrow ||
+      flags.downArrow ||
+      flags.leftArrow ||
+      flags.rightArrow ||
+      flags.pageUp ||
+      flags.pageDown ||
+      flags.delete ||
+      (flags.tab && flags.shift),
+  );
+}
+
+/** Already-structured events short-circuit so a real arrow press isn't rewritten. */
+export function recoverCsiTail(input: string, existing: CsiKeyFlags = {}): CsiKeyFlags | null {
+  if (alreadyStructured(existing)) return null;
+  for (const entry of CSI_TAIL_TO_FLAGS) {
+    if (input === entry.tail || input === `\x1b${entry.tail}`) {
+      return entry.flags;
+    }
+  }
+  return null;
+}
+
+/** Includes paste `[200~`/`[201~` for the case where their markers chunked across reads. */
+export const STRIPPABLE_CSI_FRAGMENTS: readonly string[] = [
+  "\u001b[200~",
+  "\u001b[201~",
+  "[200~",
+  "[201~",
+  ...CSI_TAIL_TO_FLAGS.flatMap((e) => [`\u001b${e.tail}`, e.tail]),
+];
+
+/** Remove every recognised CSI fragment from a string. */
+export function stripCsiFragments(input: string): string {
+  let out = input;
+  for (const frag of STRIPPABLE_CSI_FRAGMENTS) {
+    if (out.includes(frag)) out = out.replaceAll(frag, "");
+  }
+  return out;
+}

src/cli/ui/keystroke-context.tsx

@@ -0,0 +1,134 @@
+/**
+ * KeystrokeContext — React surface in front of the raw stdin reader.
+ *
+ * Replaces Ink's `useInput` chain. Reasonix's components no longer
+ * import `useInput` from "ink"; they call `useKeystroke(handler,
+ * isActive)` from this module. The provider mounted once at App
+ * level owns a `StdinReader`, subscribes a single fan-out function
+ * to it, and dispatches each parsed `KeyEvent` to every active
+ * consumer.
+ *
+ * Why a Context instead of a singleton import: the provider can be
+ * disabled in tests / replay mode without touching the components,
+ * and the lifecycle (start/stop on mount/unmount) is tied to the
+ * React tree rather than a global side effect.
+ *
+ * Why not just keep Ink's useInput: Ink's parse-keypress uses a
+ * 100 ms intra-CSI timeout that's too short for Windows ConPTY,
+ * leaking arrow-key bytes / paste markers into the buffer. Our
+ * reader uses 250 ms and recognises the ESC-stripped variants too
+ * — see `stdin-reader.ts`.
+ */
+
+import { useInput } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React as a runtime value
+import React, { createContext, useContext, useEffect, useRef } from "react";
+import { type KeyEvent, type StdinReader, getStdinReader } from "./stdin-reader.js";
+
+interface KeystrokeBus {
+  /** Subscribe — returns an unsubscribe function. */
+  subscribe(handler: KeystrokeHandler): () => void;
+}
+
+export type KeystrokeHandler = (ev: KeyEvent) => void;
+
+const KeystrokeContext = createContext<KeystrokeBus | null>(null);
+
+export interface KeystrokeProviderProps {
+  children: React.ReactNode;
+  /**
+   * Optional reader override. Tests inject a synthetic reader so
+   * they can `feed()` chunks instead of touching real stdin. Production
+   * callers leave this unset and get the singleton.
+   */
+  reader?: StdinReader;
+}
+
+export function KeystrokeProvider({
+  children,
+  reader: providedReader,
+}: KeystrokeProviderProps): React.ReactElement {
+  const handlersRef = useRef<Set<KeystrokeHandler>>(new Set());
+  // Ref so the bus value's identity is stable across re-renders —
+  // consumers don't accidentally re-subscribe every render.
+  const busRef = useRef<KeystrokeBus | null>(null);
+  if (busRef.current === null) {
+    busRef.current = {
+      subscribe(handler) {
+        handlersRef.current.add(handler);
+        return () => {
+          handlersRef.current.delete(handler);
+        };
+      },
+    };
+  }
+
+  useEffect(() => {
+    const reader = providedReader ?? getStdinReader();
+    reader.start();
+    const unsubscribe = reader.subscribe((ev) => {
+      // Snapshot the handler set so handlers added/removed during
+      // dispatch don't perturb iteration. Cheap — typical N=1-3.
+      for (const fn of [...handlersRef.current]) fn(ev);
+    });
+    return () => {
+      unsubscribe();
+      // Don't `stop()` the singleton on every unmount — multiple
+      // mounts (test reruns, hot-reload) must not tear down stdin.
+      // The singleton's own start() is idempotent; stop() is the
+      // process-exit handler's job.
+    };
+  }, [providedReader]);
+
+  return <KeystrokeContext.Provider value={busRef.current}>{children}</KeystrokeContext.Provider>;
+}
+
+/** Subscribe to keystroke events; falls back to Ink's useInput when no KeystrokeProvider is mounted. */
+export function useKeystroke(handler: KeystrokeHandler, isActive = true): void {
+  const bus = useContext(KeystrokeContext);
+  const handlerRef = useRef(handler);
+  handlerRef.current = handler;
+
+  useEffect(() => {
+    if (!bus || !isActive) return undefined;
+    return bus.subscribe((ev) => handlerRef.current(ev));
+  }, [bus, isActive]);
+
+  useInput(
+    (input, key) => {
+      if (bus) return;
+      handlerRef.current({
+        input,
+        upArrow: key.upArrow,
+        downArrow: key.downArrow,
+        leftArrow: key.leftArrow,
+        rightArrow: key.rightArrow,
+        return: key.return,
+        escape: key.escape,
+        backspace: key.backspace,
+        delete: key.delete,
+        tab: key.tab,
+        shift: key.shift,
+        ctrl: key.ctrl,
+        meta: key.meta,
+        pageUp: key.pageUp,
+        pageDown: key.pageDown,
+      });
+    },
+    { isActive: !bus && isActive },
+  );
+}
+
+/**
+ * Lower-level hook for components that need a stable subscription
+ * across the lifetime of the consumer (typically StdinReader-aware
+ * unit tests).
+ */
+export function useKeystrokeBus(): KeystrokeBus | null {
+  return useContext(KeystrokeContext);
+}
+
+/** Test helper — assemble a KeyEvent with sensible defaults. */
+export function makeKeyEvent(overrides: Partial<KeyEvent> = {}): KeyEvent {
+  return { input: "", ...overrides };
+}

src/cli/ui/log-rows.tsx

@@ -0,0 +1,613 @@
+/**
+ * Row-granular log rendering pipeline. Each `DisplayEvent` is
+ * decomposed into one or more {@link LogItem}s — either a 1-row
+ * inline `LogRow` (most chat noise: info / warn / error /
+ * step-progress) or a multi-row atomic `LogBlock` (complex
+ * components like plan / ctx-breakdown that we haven't broken
+ * down yet).
+ *
+ * Why this exists: Ink's `overflow="hidden"` does NOT reliably clip
+ * children with negative `marginTop` — content bleeds upward into
+ * sibling regions (the chrome pills disappeared at scroll=0 in 0.13.0
+ * because of exactly this). Clipping IS reliable for positive
+ * overflow at the BOTTOM of a fixed-height parent. So instead of
+ * fighting layout, we pre-flatten events into terminal-row units,
+ * slice the row list, and render the slice as a stack of `<Box
+ * height={1}>` items. Each item maps 1:1 to a terminal line, the
+ * parent's overflow=hidden naturally clips overflow at the bottom,
+ * and `justifyContent="flex-end"` (when at scroll=0) clips overflow
+ * at the top by the same mechanism.
+ *
+ * Migration plan:
+ *   · 0.13.x : info / warn / error / step-progress → rows.
+ *              Everything else falls back to a single `LogBlock`
+ *              wrapping the existing `<EventRow>` component, so
+ *              the pipeline works end-to-end while complex roles
+ *              keep their old rendering.
+ *   · later  : user / assistant text bodies → rows (split on \n,
+ *              one row per visual line).
+ *   · later  : tool / edit_file diff → rows.
+ *   · later  : plan / plan-replay / ctx-breakdown → rows.
+ *
+ * The slicer (`sliceLogItems`) treats `LogBlock`s as snap-points:
+ * a partially-visible block at the viewport's top edge gets either
+ * fully included or fully excluded, the user briefly "sticks" on
+ * boundaries when wheel-scrolling through one. Once everything is
+ * migrated to rows, scrolling is uniformly smooth.
+ */
+
+import { Box, Text } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for JSX compilation
+import React from "react";
+import { type DisplayEvent, EventRow } from "./EventLog.js";
+import { COLOR } from "./theme.js";
+
+/**
+ * Greedy character-count wrap. Accurate for ASCII / Latin; CJK
+ * (where one char ≈ 2 cells) under-counts, but the parent's
+ * overflow="hidden" still clips the bleed — at worst a visually-
+ * tight row, not a layout break. Word-aware wrap is a future polish;
+ * for now we just need the row count to be close enough that the
+ * slicer's row arithmetic and the scrollbar thumb position aren't
+ * obviously off.
+ */
+function wrapToWidth(text: string, width: number): string[] {
+  if (width <= 0) return [text];
+  const out: string[] = [];
+  for (const line of text.split("\n")) {
+    if (line.length === 0) {
+      out.push("");
+      continue;
+    }
+    if (line.length <= width) {
+      out.push(line);
+      continue;
+    }
+    let i = 0;
+    while (i < line.length) {
+      out.push(line.slice(i, i + width));
+      i += width;
+    }
+  }
+  return out;
+}
+
+/**
+ * One terminal line. Always renders inside an outer `<Box height={1}
+ * flexShrink={0}>` so the slicer's row arithmetic stays exact —
+ * overlong content soft-wraps in Ink unless we constrain row height,
+ * which we don't here, but the parent's `overflow="hidden"` clips
+ * any wrap-induced overflow.
+ */
+export interface LogRow {
+  kind: "row";
+  /** Stable React key. Must be unique within the rendered slice. */
+  id: string;
+  content: React.ReactElement;
+}
+
+/**
+ * A multi-row atomic component. Used as the fall-back when an event
+ * role hasn't been broken down into individual rows yet. The slicer
+ * snaps to block boundaries — partially-visible blocks at the viewport
+ * top either render in full or get excluded.
+ */
+export interface LogBlock {
+  kind: "block";
+  id: string;
+  /** Estimated terminal row count. Used by the slicer for cumulative
+   *  row arithmetic. Over-estimates are safer (reserve more rows
+   *  than needed) than under-estimates (block crowds the viewport
+   *  and content past the bottom clips silently). */
+  rows: number;
+  content: React.ReactElement;
+}
+
+export type LogItem = LogRow | LogBlock;
+
+/**
+ * Row count for an item, used by the slicer.
+ * `LogRow` is always 1; `LogBlock` carries its own estimate.
+ */
+export function itemRows(item: LogItem): number {
+  return item.kind === "row" ? 1 : item.rows;
+}
+
+/**
+ * Detect the leading glyph in an info-row text and pick a color tone.
+ * Mirrors the existing dispatch in `EventLog.tsx` so migrated rows
+ * look identical to the legacy renderer for the same event payload.
+ */
+function detectInfoTone(text: string): { lead: string; color: string; body: string } {
+  const m = text.match(/^([▸▶▲⚠✓✗✖↻ⓘ])\s*(.*)$/s);
+  const lead = m?.[1] ?? "▸";
+  const body = m?.[2] ?? text;
+  let color: string = COLOR.info;
+  if (lead === "▲" || lead === "⚠") color = COLOR.warn;
+  else if (lead === "✓") color = COLOR.ok;
+  else if (lead === "✗" || lead === "✖") color = COLOR.err;
+  else if (lead === "↻") color = COLOR.primary;
+  return { lead, color, body };
+}
+
+/**
+ * Render a single accent-bar row. The bar is the left vertical
+ * border of the wrapper Box; subsequent rows of the same event share
+ * the bar's color so vertically-adjacent rows visually merge into one
+ * continuous bar (which is what users read as "this is one log entry").
+ *
+ * `prefix` is rendered inline before the line's body; pass `null` for
+ * continuation lines that should align under the body, not the glyph.
+ */
+function AccentRow({
+  color,
+  prefix,
+  body,
+  bodyColor,
+  bodyDim,
+}: {
+  color: string;
+  prefix: React.ReactNode | null;
+  body: string;
+  bodyColor?: string;
+  bodyDim?: boolean;
+}) {
+  return (
+    <Box
+      borderStyle="single"
+      borderTop={false}
+      borderRight={false}
+      borderBottom={false}
+      borderColor={color}
+      paddingLeft={1}
+    >
+      {prefix}
+      <Text color={bodyColor} dimColor={bodyDim}>
+        {body}
+      </Text>
+    </Box>
+  );
+}
+
+/**
+ * Decompose a plain "accent-bar + glyph + multiline text" event into
+ * one row per visual line, word-wrapping at `width`. The first line
+ * carries the glyph; continuation lines align under the body so they
+ * read as one entry.
+ */
+function accentRows(
+  baseId: string,
+  glyph: string,
+  glyphColor: string,
+  text: string,
+  bodyColor: string | undefined,
+  bodyDim: boolean,
+  width: number,
+): LogRow[] {
+  // Reserve cells for the border (1) + paddingLeft (1) + glyph + 2-space
+  // gap so the wrap width matches the visual content column.
+  const indentCells = 1 + 1 + glyph.length + 2;
+  const inner = Math.max(8, width - indentCells);
+  const lines = wrapToWidth(text, inner);
+  return lines.map((line, i) => ({
+    kind: "row" as const,
+    id: `${baseId}/${i}`,
+    content:
+      i === 0 ? (
+        <AccentRow
+          color={glyphColor}
+          prefix={
+            <>
+              <Text color={glyphColor} bold>
+                {glyph}
+              </Text>
+              <Text>{"  "}</Text>
+            </>
+          }
+          body={line}
+          bodyColor={bodyColor}
+          bodyDim={bodyDim}
+        />
+      ) : (
+        <AccentRow
+          color={glyphColor}
+          prefix={<Text>{" ".repeat(glyph.length + 2)}</Text>}
+          body={line}
+          bodyColor={bodyColor}
+          bodyDim={bodyDim}
+        />
+      ),
+  }));
+}
+
+/**
+ * Decompose a finished `assistant` event into rows so a long summary
+ * scrolls one terminal line at a time. Header (glyph + model badge)
+ * is its own row; body becomes one row per wrapped line under the
+ * assistant accent bar; stats / repair occupy dedicated trailing rows.
+ *
+ * **Fall-through:** events that carry branch / reasoning / non-empty
+ * planState fall back to the legacy `LogBlock` because those
+ * sub-components have their own internal layout we haven't row-split
+ * yet. This keeps every advanced-feature event readable; the dominant
+ * case (a plain summary turn) gets row-level scrolling.
+ *
+ * **Trade-off:** the row body bypasses the markdown renderer, so
+ * inline formatting (bold / italic / code spans) is rendered as plain
+ * text. Most assistant prose reads fine without it, and the original
+ * formatted text is still in `~/.reasonix/sessions/<name>.jsonl`. If
+ * code-block fidelity matters, users can /transcript or pipe the file
+ * to `bat`. Worth it for the scrolling win.
+ */
+function assistantToRows(event: DisplayEvent, projectRoot?: string, width = 80): LogItem[] {
+  // Skip row migration for events with branch / reasoning / planState —
+  // those sub-blocks have nested layout we'd lose by flattening, and
+  // they're uncommon enough that LogBlock fall-back is fine for v1.
+  const hasComplexSub =
+    event.branch || event.reasoning || (event.planState && Object.keys(event.planState).length > 0);
+  if (hasComplexSub) {
+    return [
+      {
+        kind: "block",
+        id: event.id,
+        rows: estimatedHeight(event),
+        content: <EventRow event={event} projectRoot={projectRoot} />,
+      },
+    ];
+  }
+
+  const items: LogItem[] = [];
+  // Top spacer matches the legacy renderer's `marginTop={1}`.
+  items.push({
+    kind: "row",
+    id: `${event.id}/spacer-top`,
+    content: <Text> </Text>,
+  });
+  // Header: assistant glyph + (optional) model badge.
+  items.push({
+    kind: "row",
+    id: `${event.id}/head`,
+    content: (
+      <Box>
+        <Text color={COLOR.assistant} bold>
+          {"◆"}
+        </Text>
+        {event.stats ? (
+          <>
+            <Text>{"  "}</Text>
+            <Text backgroundColor={COLOR.assistant} color="black" bold>
+              {` ${event.stats.model.replace(/^deepseek-/, "")} `}
+            </Text>
+          </>
+        ) : null}
+      </Box>
+    ),
+  });
+  // Body rows — one per wrapped line, all sharing the assistant
+  // accent bar on the left so they read as one entry visually even
+  // though they're independent rows for scroll arithmetic.
+  const body = event.text || "(empty body — likely tool-call only)";
+  const dim = !event.text;
+  items.push(...accentRows(event.id, "", COLOR.assistant, body, COLOR.assistant, dim, width));
+  // Repair note: single line, accent violet, indented under the body.
+  if (event.repair) {
+    items.push({
+      kind: "row",
+      id: `${event.id}/repair`,
+      content: (
+        <Box paddingLeft={2}>
+          <Text color={COLOR.accent}>{event.repair}</Text>
+        </Box>
+      ),
+    });
+  }
+  // Stats line — inlined here (kept as a 1-row LogRow rather than a
+  // LogBlock) so the user can scroll past it cleanly.
+  if (event.stats) {
+    const hit = (event.stats.cacheHitRatio * 100).toFixed(1);
+    const hitColor =
+      event.stats.cacheHitRatio >= 0.7
+        ? "#4ade80"
+        : event.stats.cacheHitRatio >= 0.4
+          ? "#fcd34d"
+          : "#f87171";
+    items.push({
+      kind: "row",
+      id: `${event.id}/stats`,
+      content: (
+        <Box paddingLeft={2}>
+          <Text color={hitColor} bold>
+            {`⌬ ${hit}%`}
+          </Text>
+          <Text dimColor>{"  ·  "}</Text>
+          <Text color="#94a3b8">{"in "}</Text>
+          <Text color="#67e8f9" bold>
+            {event.stats.usage.promptTokens}
+          </Text>
+          <Text color="#94a3b8">{" → out "}</Text>
+          <Text color="#c4b5fd" bold>
+            {event.stats.usage.completionTokens}
+          </Text>
+          <Text dimColor>{"  ·  "}</Text>
+          <Text color="#86efac" bold>{`$${event.stats.cost.toFixed(6)}`}</Text>
+        </Box>
+      ),
+    });
+  }
+  return items;
+}
+
+/**
+ * Convert a single `DisplayEvent` to its row-pipeline representation.
+ * Migrated roles return `LogRow[]` (one item per visual terminal line,
+ * word-wrapped to `width`); everything else falls back to a single
+ * `LogBlock` wrapping the legacy `<EventRow>` component.
+ *
+ * `projectRoot` is forwarded to the legacy renderer for fall-back
+ * blocks (used by the markdown renderer to resolve relative paths).
+ *
+ * `width` is the terminal column count. Used to word-wrap accent rows
+ * so a single long line decomposes into the right number of rows —
+ * this matters for the slicer's row arithmetic and for the scrollbar
+ * thumb position, both of which assume row count == visual lines.
+ */
+export function eventToItems(event: DisplayEvent, projectRoot?: string, width = 80): LogItem[] {
+  if (event.role === "info") {
+    const { lead, color, body } = detectInfoTone(event.text);
+    return accentRows(event.id, lead, color, body, undefined, true, width);
+  }
+  if (event.role === "warning") {
+    return accentRows(event.id, "▲ warn", COLOR.warn, event.text, COLOR.warn, false, width);
+  }
+  if (event.role === "error") {
+    return accentRows(event.id, "✦ error", COLOR.err, event.text, COLOR.err, false, width);
+  }
+  if (event.role === "assistant" && !event.streaming) {
+    return assistantToRows(event, projectRoot, width);
+  }
+  if (event.role === "step-progress") {
+    const sp = event.stepProgress;
+    const counter = sp && sp.total > 0 ? `${sp.completed}/${sp.total}` : "";
+    const label = sp?.title ? `${sp.stepId} · ${sp.title}` : (sp?.stepId ?? "");
+    const rows: LogRow[] = [];
+    // marginTop={1} in the legacy renderer — emit one blank spacer row.
+    rows.push({
+      kind: "row",
+      id: `${event.id}/spacer`,
+      content: <Text> </Text>,
+    });
+    // Header row: green-on-black STEP pill + counter + label.
+    rows.push({
+      kind: "row",
+      id: `${event.id}/head`,
+      content: (
+        <Box>
+          <Text backgroundColor="#4ade80" color="black" bold>
+            {" ✓ STEP "}
+          </Text>
+          {counter ? (
+            <>
+              <Text>{"  "}</Text>
+              <Text color="#4ade80" bold>
+                {counter}
+              </Text>
+            </>
+          ) : null}
+          <Text>{"  "}</Text>
+          <Text color="#86efac">{label}</Text>
+        </Box>
+      ),
+    });
+    // Optional body lines (one per \n-split line).
+    if (event.text) {
+      for (const [i, line] of event.text.split("\n").entries()) {
+        rows.push({
+          kind: "row",
+          id: `${event.id}/body/${i}`,
+          content: (
+            <Box paddingLeft={2}>
+              <Text dimColor>{line}</Text>
+            </Box>
+          ),
+        });
+      }
+    }
+    if (sp?.notes) {
+      rows.push({
+        kind: "row",
+        id: `${event.id}/notes`,
+        content: (
+          <Box paddingLeft={2}>
+            <Text color="#fbbf24" dimColor>
+              {`note: ${sp.notes}`}
+            </Text>
+          </Box>
+        ),
+      });
+    }
+    return rows;
+  }
+
+  // Fallback: render the whole event as one atomic block via the
+  // legacy `EventRow`. Estimates row count via a copy of the slicer's
+  // heightOf logic. Once a role is migrated above, this branch stops
+  // running for that role.
+  return [
+    {
+      kind: "block",
+      id: event.id,
+      rows: estimatedHeight(event),
+      content: <EventRow event={event} projectRoot={projectRoot} />,
+    },
+  ];
+}
+
+/**
+ * Mirror of the slicer's `heightOfEvent` from App.tsx — kept in sync
+ * by hand. Used only for fall-back `LogBlock`s; migrated roles
+ * compute their row count exactly via the row count itself.
+ */
+function estimatedHeight(e: DisplayEvent): number {
+  const text = e.text ?? "";
+  const wrapLines = Math.max(0, Math.floor(text.length / 80));
+  if (e.role === "user") return 3 + wrapLines;
+  if (e.role === "assistant") {
+    let h = 4 + wrapLines;
+    if (e.reasoning) h += 3;
+    if (e.branch) h += 4;
+    return h;
+  }
+  if (e.role === "tool") {
+    const isEditFile = e.toolName === "edit_file" || e.toolName?.endsWith("_edit_file");
+    if (isEditFile) {
+      const diffLines = (text.match(/\n/g)?.length ?? 0) + 1;
+      return 6 + Math.min(20, diffLines);
+    }
+    return 2;
+  }
+  if (e.role === "plan" || e.role === "plan-replay" || e.role === "plan-resumed") return 10;
+  if (e.role === "ctx-breakdown") return 7;
+  return 2;
+}
+
+export interface RowSlice {
+  items: LogItem[];
+  /** Highest valid scroll offset (rows). Caller clamps with this. */
+  maxScrollRows: number;
+  /** Total rows across all events (informational, e.g. for "↑ N rows above" hints). */
+  totalRows: number;
+}
+
+/**
+ * Slice the flat `LogItem` list to fit `available` viewport rows,
+ * scrolled up by `scrollOffsetRows` from the bottom.
+ *
+ * Snap behavior: if the viewport top edge would fall *inside* a
+ * `LogBlock`, the block is included in full (so it might extend
+ * partially above the viewport — clipped by the parent's flex-end
+ * + overflow=hidden). The same trick that makes the BOTTOM of a tall
+ * latest event readable is what makes block snap-rendering safe.
+ */
+export function sliceLogItems(
+  items: readonly LogItem[],
+  available: number,
+  scrollOffsetRows: number,
+): RowSlice {
+  if (items.length === 0) {
+    return { items: [], maxScrollRows: 0, totalRows: 0 };
+  }
+  const heights = items.map(itemRows);
+  const totalRows = heights.reduce((a, b) => a + b, 0);
+  // Cap the scroll so the OLDEST viewport-full of rows (oldest line at
+  // the top of the viewport) is reachable but the user never scrolls
+  // past it into empty space. With `totalRows - 1` the user could
+  // scroll until only one row remained visible — scrollbar at the top
+  // and viewport mostly empty, which feels broken. Leaving a viewport-
+  // worth of rows below the absolute top means Home / max-scroll lands
+  // on a fully-populated viewport showing the start of the log.
+  const maxScrollRows = Math.max(0, totalRows - available);
+  const offset = Math.max(0, Math.min(scrollOffsetRows, maxScrollRows));
+
+  const viewportBottom = totalRows - offset;
+  const viewportTop = Math.max(0, viewportBottom - available);
+
+  // Walk forward, picking items whose row range overlaps the viewport.
+  // Items entirely above viewport are dropped; entirely below ends the
+  // walk early.
+  let cursor = 0;
+  let firstIdx = -1;
+  let lastIdx = -1;
+  for (let i = 0; i < items.length; i++) {
+    const eStart = cursor;
+    const eEnd = cursor + heights[i]!;
+    cursor = eEnd;
+    if (eEnd <= viewportTop) continue;
+    if (eStart >= viewportBottom) break;
+    if (firstIdx === -1) firstIdx = i;
+    lastIdx = i;
+  }
+  if (firstIdx === -1) {
+    // Should not happen with clamped offset + non-empty items, but
+    // fall back to "render the last item" so the user never sees a
+    // blank middle.
+    return { items: [items[items.length - 1]!], maxScrollRows, totalRows };
+  }
+  return {
+    items: items.slice(firstIdx, lastIdx + 1),
+    maxScrollRows,
+    totalRows,
+  };
+}
+
+/**
+ * Wrap a `LogItem` in the height-1 (or natural-height for blocks) Box
+ * that keeps the slicer's row arithmetic exact. `flexShrink={0}`
+ * prevents Ink from squashing rows when the parent's content overflows.
+ */
+export function renderLogItem(item: LogItem): React.ReactElement {
+  if (item.kind === "row") {
+    return (
+      <Box key={item.id} height={1} flexShrink={0}>
+        {item.content}
+      </Box>
+    );
+  }
+  return (
+    <Box key={item.id} flexShrink={0}>
+      {item.content}
+    </Box>
+  );
+}
+
+/**
+ * One-row hint pinned at the bottom of the log viewport when the user
+ * has scrolled up. Tells them how many rows of newer content sit
+ * below the visible window and how to jump back. Hidden when the user
+ * is at the bottom (offset === 0) since there's nothing to point to.
+ *
+ * `rowsBelow` is the same as the active `logScrollOffset` (rows from
+ * the bottom that aren't currently visible).
+ */
+export function BottomHint({
+  rowsBelow,
+  totalRows,
+  viewportRows,
+}: {
+  rowsBelow: number;
+  totalRows: number;
+  viewportRows: number;
+}) {
+  if (rowsBelow <= 0) return null;
+  const maxScroll = Math.max(1, totalRows - viewportRows);
+  const ratioFromTop = Math.max(0, Math.min(1, (totalRows - rowsBelow - viewportRows) / maxScroll));
+  const pct = Math.round((1 - ratioFromTop) * 100);
+  const rowsAbove = Math.max(0, totalRows - viewportRows - rowsBelow);
+  const barCells = 16;
+  const markerAt = Math.max(0, Math.min(barCells - 1, Math.round(ratioFromTop * (barCells - 1))));
+  const left = "─".repeat(markerAt);
+  const right = "─".repeat(barCells - 1 - markerAt);
+  return (
+    <Box height={1} flexShrink={0}>
+      <Text color={COLOR.primary} bold>
+        {`↑ ${rowsAbove}`}
+      </Text>
+      <Text>{"  "}</Text>
+      <Text dimColor>▕</Text>
+      <Text color={COLOR.info} dimColor>
+        {left}
+      </Text>
+      <Text color={COLOR.brand} bold>
+        ●
+      </Text>
+      <Text color={COLOR.info} dimColor>
+        {right}
+      </Text>
+      <Text dimColor>▏</Text>
+      <Text>{"  "}</Text>
+      <Text color={COLOR.primary} bold>{`${pct}%`}</Text>
+      <Text>{"  "}</Text>
+      <Text color={COLOR.primary}>{`↓ ${rowsBelow}`}</Text>
+      <Text dimColor>{"  ·  End to jump · wheel to scroll"}</Text>
+    </Box>
+  );
+}

src/cli/ui/loop.ts

@@ -0,0 +1,80 @@
+/** Pure parsing for `/loop <interval> <prompt>`; cancellation contract is enforced in App.tsx. */
+
+/** Lower bound on loop interval (ms). Faster than this would queue submits faster than turns finish. */
+export const MIN_LOOP_INTERVAL_MS = 5_000;
+/** Upper bound on loop interval (ms). Beyond a few hours, use cron. */
+export const MAX_LOOP_INTERVAL_MS = 6 * 60 * 60_000;
+
+/** Returns null on bad shape OR out-of-range; caller surfaces as usage hint. */
+export function parseLoopInterval(raw: string): { ms: number } | null {
+  const s = raw.trim().toLowerCase();
+  if (!s) return null;
+  const m = /^([0-9]+(?:\.[0-9]+)?)(s|sec|secs|m|min|mins|h|hr|hrs)?$/.exec(s);
+  if (!m) return null;
+  const n = Number.parseFloat(m[1] ?? "");
+  if (!Number.isFinite(n) || n <= 0) return null;
+  const unit = m[2] ?? "s";
+  let ms: number;
+  if (unit === "s" || unit === "sec" || unit === "secs") ms = Math.round(n * 1000);
+  else if (unit === "m" || unit === "min" || unit === "mins") ms = Math.round(n * 60_000);
+  else if (unit === "h" || unit === "hr" || unit === "hrs") ms = Math.round(n * 60 * 60_000);
+  else return null;
+  if (ms < MIN_LOOP_INTERVAL_MS) return null;
+  if (ms > MAX_LOOP_INTERVAL_MS) return null;
+  return { ms };
+}
+
+export interface ParsedLoopArgs {
+  intervalMs: number;
+  prompt: string;
+}
+
+export type LoopCommand =
+  | { kind: "start"; intervalMs: number; prompt: string }
+  | { kind: "stop" }
+  | { kind: "status" }
+  | { kind: "error"; message: string };
+
+export function parseLoopCommand(args: readonly string[]): LoopCommand {
+  if (args.length === 0) return { kind: "status" };
+  const first = (args[0] ?? "").toLowerCase();
+  if (args.length === 1 && (first === "stop" || first === "off" || first === "cancel")) {
+    return { kind: "stop" };
+  }
+  const interval = parseLoopInterval(args[0] ?? "");
+  if (!interval) {
+    return {
+      kind: "error",
+      message:
+        "usage: /loop <interval> <prompt>   (interval = 5s..6h, e.g. 30s, 5m, 1h)\n" +
+        "       /loop stop                  (cancel an active loop)\n" +
+        "       /loop                       (show active-loop status)",
+    };
+  }
+  const prompt = args.slice(1).join(" ").trim();
+  if (!prompt) {
+    return {
+      kind: "error",
+      message: `usage: /loop ${args[0]} <prompt>   — interval is fine but the prompt is missing.`,
+    };
+  }
+  return { kind: "start", intervalMs: interval.ms, prompt };
+}
+
+export function formatLoopStatus(prompt: string, nextFireMs: number, iter: number): string {
+  const preview = prompt.length > 36 ? `${prompt.slice(0, 33)}…` : prompt;
+  const when = nextFireMs <= 0 ? "firing now" : `next in ${formatDuration(nextFireMs)}`;
+  return `loop: \`${preview}\` · ${when} · iter ${iter}`;
+}
+
+export function formatDuration(ms: number): string {
+  if (ms < 1000) return `${ms}ms`;
+  const totalSec = Math.round(ms / 1000);
+  if (totalSec < 60) return `${totalSec}s`;
+  const m = Math.floor(totalSec / 60);
+  const s = totalSec % 60;
+  if (m < 60) return s === 0 ? `${m}m` : `${m}m${s}s`;
+  const h = Math.floor(m / 60);
+  const mm = m % 60;
+  return mm === 0 ? `${h}h` : `${h}h${mm}m`;
+}

src/cli/ui/markdown-frame.ts

@@ -0,0 +1,310 @@
+/** Markdown→Frame compiler reusing `parseBlocks` from markdown.tsx; tables / edit blocks / citations fall back to plain text. */
+
+import {
+  type Cell,
+  type Frame,
+  type TextOpts,
+  borderLeft,
+  empty,
+  pad,
+  text,
+  vstack,
+} from "../../frame/index.js";
+import { type Block, parseBlocks } from "./markdown.js";
+import { COLOR } from "./theme.js";
+
+/** Mirrors `markdown.tsx` INLINE_RE — link/bold/italic/code/strike/escape. */
+const INLINE_RE =
+  /(\[([^\]\n]+)\]\(([^)\n]+)\)|\*\*\*([^*\n]+?)\*\*\*|\*\*([^*\n]+?)\*\*|```([^\n]+?)```|`([^`\n]+?)`|~~([^~\n]+?)~~|(?<![*\w])\*([^*\n]+?)\*(?!\w)|\\([*_~`[\](){}#+\-.!\\]))/g;
+
+interface InlineSegment {
+  text: string;
+  opts: Omit<TextOpts, "width">;
+}
+
+function parseInline(input: string, baseOpts: Omit<TextOpts, "width">): InlineSegment[] {
+  const out: InlineSegment[] = [];
+  let lastEnd = 0;
+  // The regex is /g so we must reset lastIndex when reusing it.
+  INLINE_RE.lastIndex = 0;
+  for (let m = INLINE_RE.exec(input); m !== null; m = INLINE_RE.exec(input)) {
+    if (m.index > lastEnd) {
+      out.push({ text: input.slice(lastEnd, m.index), opts: baseOpts });
+    }
+    const linkText = m[2];
+    const linkUrl = m[3];
+    const boldItalic = m[4];
+    const bold = m[5];
+    const code3 = m[6];
+    const code1 = m[7];
+    const strike = m[8];
+    const italic = m[9];
+    const escapeChar = m[10];
+    if (linkText !== undefined) {
+      out.push({
+        text: linkText,
+        opts: { ...baseOpts, fg: COLOR.accent, underline: true, href: linkUrl },
+      });
+    } else if (boldItalic !== undefined) {
+      out.push({ text: boldItalic, opts: { ...baseOpts, bold: true, italic: true } });
+    } else if (bold !== undefined) {
+      out.push({ text: bold, opts: { ...baseOpts, bold: true } });
+    } else if (code3 !== undefined) {
+      // Strip leading "lang " prefix (consistent with the legacy renderer)
+      const stripped = code3.replace(/^(\w+)\s+/, "");
+      out.push({ text: stripped, opts: { ...baseOpts, fg: "#67e8f9", bg: "#0f172a" } });
+    } else if (code1 !== undefined) {
+      out.push({ text: code1, opts: { ...baseOpts, fg: "#67e8f9", bg: "#0f172a" } });
+    } else if (strike !== undefined) {
+      out.push({ text: strike, opts: { ...baseOpts, dim: true } });
+    } else if (italic !== undefined) {
+      out.push({ text: italic, opts: { ...baseOpts, italic: true } });
+    } else if (escapeChar !== undefined) {
+      out.push({ text: escapeChar, opts: baseOpts });
+    }
+    lastEnd = m.index + m[0]!.length;
+  }
+  if (lastEnd < input.length) {
+    out.push({ text: input.slice(lastEnd), opts: baseOpts });
+  }
+  return out;
+}
+
+/** Single wrap loop over flattened (cell, style) atoms — keeps wrap logic in one place across styles. */
+function segmentsToFrame(segs: readonly InlineSegment[], width: number): Frame {
+  if (width <= 0) return empty(0);
+  // Build a flat list of "atoms" — each atom is one grapheme + its
+  // style. We reuse Frame's text() to handle grapheme width / 2-wide
+  // chars correctly: rendering each segment to a 1-row Frame at a
+  // very wide budget gives back its cell array, which we splice
+  // together for the wrap.
+  const atoms: Cell[] = [];
+  for (const seg of segs) {
+    if (!seg.text) continue;
+    // Use a generous width so the segment doesn't pre-wrap inside text()
+    const f = text(seg.text, { ...seg.opts, width: Math.max(width, seg.text.length * 2 + 4) });
+    if (f.rows.length > 0) {
+      // Strip trailing space-padding the text() helper adds; the
+      // segment's actual cells are the leading non-space prefix.
+      let stop = f.rows[0]!.length;
+      while (
+        stop > 0 &&
+        f.rows[0]![stop - 1]!.char === " " &&
+        f.rows[0]![stop - 1]!.fg === undefined &&
+        f.rows[0]![stop - 1]!.bg === undefined
+      ) {
+        stop--;
+      }
+      for (let i = 0; i < stop; i++) atoms.push(f.rows[0]![i]!);
+    }
+    // Multi-line segments (rare with inline markup, but possible if
+    // text contained \n) — append blank cells then continue.
+    for (let li = 1; li < f.rows.length; li++) {
+      // Insert a newline marker via a sentinel cell? Simpler: emit
+      // a hard-break row right now and continue with the next line.
+      // To keep `atoms` 1-D, we encode \n as a special cell char and
+      // handle in the wrap loop. Use a SOH sentinel char that won't
+      // appear in real text.
+      atoms.push({ char: "\n", width: 1 });
+      let stop = f.rows[li]!.length;
+      while (
+        stop > 0 &&
+        f.rows[li]![stop - 1]!.char === " " &&
+        f.rows[li]![stop - 1]!.fg === undefined
+      ) {
+        stop--;
+      }
+      for (let i = 0; i < stop; i++) atoms.push(f.rows[li]![i]!);
+    }
+  }
+  // Greedy wrap: walk atoms, accumulate cells until current row width
+  // would exceed `width` (skipping tail cells from the count); on a
+  // newline atom, force a row break.
+  const SPACE: Cell = { char: " ", width: 1 };
+  const rows: Cell[][] = [];
+  let cur: Cell[] = [];
+  let curW = 0;
+  let lastSpaceIdx = -1;
+  const flushRow = (forceNewline = false): void => {
+    while (curW < width) {
+      cur.push(SPACE);
+      curW += 1;
+    }
+    rows.push(cur);
+    cur = [];
+    curW = 0;
+    lastSpaceIdx = -1;
+    if (forceNewline) return;
+  };
+  for (const a of atoms) {
+    if (a.char === "\n") {
+      flushRow(true);
+      continue;
+    }
+    const w = a.tail ? 0 : a.width;
+    if (curW + w > width) {
+      // Try to break at the last whitespace we saw — soft wrap.
+      if (lastSpaceIdx >= 0 && lastSpaceIdx > 0) {
+        // Cut the row at lastSpaceIdx; carry overflow atoms into the
+        // next row.
+        const overflow = cur.slice(lastSpaceIdx + 1);
+        cur = cur.slice(0, lastSpaceIdx);
+        let newW = 0;
+        for (const c of cur) newW += c.tail ? 0 : c.width;
+        // Pad current row to width
+        while (newW < width) {
+          cur.push(SPACE);
+          newW += 1;
+        }
+        rows.push(cur);
+        cur = overflow;
+        curW = 0;
+        for (const c of cur) curW += c.tail ? 0 : c.width;
+        lastSpaceIdx = -1;
+      } else {
+        // No whitespace to break at — hard wrap.
+        flushRow();
+      }
+    }
+    if (a.char === " ") lastSpaceIdx = cur.length;
+    cur.push(a);
+    curW += w;
+  }
+  if (cur.length > 0 || rows.length === 0) {
+    flushRow();
+  }
+  return { width, rows };
+}
+
+function paragraphFrame(p: { text: string }, width: number): Frame {
+  const segs = parseInline(p.text, {});
+  return segmentsToFrame(segs, width);
+}
+
+function headingFrame(h: { level: number; text: string }, width: number): Frame {
+  const isMajor = h.level <= 3;
+  const fg = isMajor ? COLOR.brand : COLOR.accent;
+  const segs = parseInline(h.text, { bold: true, fg, dim: !isMajor });
+  return vstack(segmentsToFrame(segs, width), text("", { width }));
+}
+
+/** Continuation lines align under the body, not under the bullet. */
+function bulletListFrame(
+  b: { items: { text: string; task?: "done" | "todo" }[]; ordered?: boolean },
+  width: number,
+): Frame {
+  const rows: Frame[] = [];
+  for (let i = 0; i < b.items.length; i++) {
+    const item = b.items[i]!;
+    let prefix: string;
+    let prefixOpts: Omit<TextOpts, "width">;
+    if (item.task === "done") {
+      prefix = "[x] ";
+      prefixOpts = { fg: COLOR.ok, bold: true };
+    } else if (item.task === "todo") {
+      prefix = "[ ] ";
+      prefixOpts = { fg: COLOR.warn, bold: true };
+    } else if (b.ordered) {
+      prefix = `${i + 1}. `;
+      prefixOpts = { fg: COLOR.info, bold: true };
+    } else {
+      prefix = "• ";
+      prefixOpts = { fg: COLOR.info, bold: true };
+    }
+    const prefixWidth = prefix.length;
+    const indentRow = " ".repeat(prefixWidth);
+    const innerSegs = parseInline(item.text, {});
+    const innerFrame = segmentsToFrame(innerSegs, Math.max(8, width - prefixWidth));
+    // Decorate first line with prefix, subsequent lines with spaces.
+    const decoratedRows: Frame[] = innerFrame.rows.map((r, li) => {
+      const indent =
+        li === 0
+          ? text(prefix, { width: prefixWidth, ...prefixOpts })
+          : text(indentRow, { width: prefixWidth });
+      return {
+        width: prefixWidth + innerFrame.width,
+        rows: [[...indent.rows[0]!, ...r]],
+      };
+    });
+    rows.push(...decoratedRows);
+  }
+  return vstack(...rows);
+}
+
+function codeBlockFrame(c: { lang: string; text: string }, width: number): Frame {
+  const lines = c.text.split("\n");
+  const rows: Frame[] = [];
+  if (c.lang) {
+    rows.push(text(c.lang, { width, fg: COLOR.info, dim: true, italic: true }));
+  }
+  for (const line of lines) {
+    rows.push(text(line || " ", { width, fg: "#67e8f9", bg: "#0f172a" }));
+  }
+  return vstack(...rows);
+}
+
+function blockquoteFrame(bq: { children: Block[] }, width: number): Frame {
+  const inner = bq.children.map((child) => blockToFrame(child, Math.max(8, width - 2)));
+  const stacked = inner.length === 0 ? empty(Math.max(8, width - 2)) : vstack(...inner);
+  return borderLeft(pad(stacked, 0, 0, 0, 1), COLOR.info);
+}
+
+function hrFrame(width: number): Frame {
+  return text("─".repeat(width), { width, fg: COLOR.info, dim: true });
+}
+
+function blockToFrame(b: Block, width: number): Frame {
+  switch (b.kind) {
+    case "paragraph":
+      return paragraphFrame(b, width);
+    case "heading":
+      return headingFrame(b, width);
+    case "bullet":
+      return bulletListFrame(b, width);
+    case "code":
+      return codeBlockFrame(b, width);
+    case "quote":
+      return blockquoteFrame(b, width);
+    case "hr":
+      return hrFrame(width);
+    case "table":
+      // Tables: render as plain-text rows for now; full table layout
+      // is a future migration. Header gets bold, body rows dim.
+      return vstack(
+        text(b.header.join(" | "), { width, bold: true }),
+        text(b.header.map(() => "─").join("─┼─"), { width, dim: true }),
+        text(b.rows.map((r) => r.join(" | ")).join("\n"), { width, dim: true }),
+      );
+    case "edit-block":
+      // Aider edit blocks: render filename + SEARCH/REPLACE summaries
+      // as plain text. The full diff renderer lives in EditBlockRow
+      // which we keep on the legacy Ink path until migration.
+      return text(`${b.filename}\n<<< SEARCH\n${b.search}\n=======\n${b.replace}\n>>> REPLACE`, {
+        width,
+        dim: true,
+      });
+    default:
+      // Unknown block kind — should never happen given the parser's
+      // exhaustive Block union, but stay defensive.
+      return empty(width);
+  }
+}
+
+export function markdownToFrame(markdown: string, width: number): Frame {
+  if (!markdown) return empty(width);
+  const blocks = parseBlocks(markdown);
+  if (blocks.length === 0) return empty(width);
+  const frames: Frame[] = [];
+  for (let i = 0; i < blocks.length; i++) {
+    const b = blocks[i]!;
+    frames.push(blockToFrame(b, width));
+    // Inter-block separator. Skip after blocks that already include
+    // their own trailing spacer (headings) so we don't double-space.
+    const isLast = i === blocks.length - 1;
+    const carriesOwnSpacer = b.kind === "heading";
+    if (!isLast && !carriesOwnSpacer) {
+      frames.push(text("", { width }));
+    }
+  }
+  return vstack(...frames);
+}

src/cli/ui/mcp-browse.ts

@@ -1,24 +1,4 @@
-/**
- * `/resource` and `/prompt` slash handlers for the chat/code TUI.
- *
- * The slash-command registry (slash.ts) advertises both commands so the
- * argument-level picker and /help surface them, but the actual read/fetch
- * work is async — McpClient.readResource and getPrompt both round-trip to
- * the server — so it doesn't fit the synchronous `handleSlash` shape used
- * by every other slash command. App.tsx intercepts the commands directly
- * and calls into the helpers below.
- *
- * Split by effect boundary:
- *   - formatters (resource list, contents, prompt list, messages) are
- *     pure over already-fetched data and unit-tested
- *   - find-server helpers are pure lookups against inspection reports
- *   - `handleMcpBrowseSlash` is the async orchestrator App.tsx calls
- *
- * v1 intentionally does NOT inject the fetched resource/prompt into the
- * next model turn. It's a display-only browser so users can see what
- * their MCP servers expose. A future version may add a Tab-to-inject
- * hotkey once the UX is settled.
- */
+/** `/resource` + `/prompt` handlers — async (round-trip to MCP server), so App.tsx calls directly instead of `handleSlash`. */
 
 import type { McpClient } from "../../mcp/client.js";
 import type {
@@ -30,11 +10,6 @@ import type {
 import type { DisplayEvent } from "./EventLog.js";
 import type { McpServerSummary } from "./slash.js";
 
-/**
- * React setState for Historical — typed loose because the App state
- * shape is App-internal. We only ever append, so `(prev) => prev.concat(row)`
- * works against any array-of-DisplayEvent state.
- */
 export type HistoricalSetter = (updater: (prev: DisplayEvent[]) => DisplayEvent[]) => void;
 
 export function formatResourceList(servers: readonly McpServerSummary[]): string {
@@ -167,12 +142,6 @@ function formatOnePromptMessage(m: McpPromptMessage): string {
   return `[non-text content: ${block.type ?? "unknown"}]`;
 }
 
-/**
- * Orchestrator. Looks up the right server, calls readResource/getPrompt
- * via its `client`, and pushes one info row into `Historical`. Errors
- * (server missing, -32601, network) surface as a warning row; the user
- * can always fall back to `reasonix mcp inspect <spec>` for diagnostics.
- */
 export async function handleMcpBrowseSlash(
   kind: "resource" | "prompt",
   arg: string,

src/cli/ui/multiline-keys.ts

@@ -1,25 +1,4 @@
-/**
- * Pure keystroke → action reducer for PromptInput.
- *
- * Kept separate from the React component so the keyboard semantics
- * are easy to unit-test. The component threads `useInput` through
- * this function and applies the returned action.
- *
- * Edit model:
- *   - Full cursor support. ←/→ move one column. ↑/↓ move across
- *     lines in a multi-line buffer (column preserved when possible).
- *     Ctrl+A / Ctrl+E jump to start / end of the current line.
- *   - Backspace deletes the char before the cursor; Delete deletes
- *     the char under the cursor.
- *   - Printable chars (including multi-char paste bursts) insert
- *     at the cursor.
- *   - Enter submits unless Shift is held (newline), the line ends
- *     with '\' and cursor is at end (bash-style continuation), or
- *     the input is Ctrl+J (LF, terminal-universal newline).
- *   - Parent owns Tab, Esc, PageUp/Down (slash-complete, abort,
- *     unused). Arrow keys are split: empty buffer → parent (history
- *     recall); non-empty → child (cursor movement).
- */
+/** Pure keystroke→action reducer; arrow keys at buffer boundary defer to the parent for history recall. */
 
 export interface MultilineKey {
   input: string;
@@ -47,8 +26,14 @@ export interface MultilineAction {
   /** When `true`, fire `onSubmit(submitValue ?? value)`. */
   submit: boolean;
   submitValue?: string;
+  /** Set when ↑/↓ hits a buffer boundary — parent handles history recall. */
+  historyHandoff?: "prev" | "next";
+  /** Reducer is pure — hands raw paste to PromptInput which allocates a sentinel and inserts that. */
+  pasteRequest?: { content: string };
 }
 
+import { recoverCsiTail, stripCsiFragments } from "./key-normalize.js";
+
 const BACKSLASH_SUFFIX = /\\$/;
 
 const NOOP: MultilineAction = { next: null, cursor: null, submit: false };
@@ -56,19 +41,46 @@ const NOOP: MultilineAction = { next: null, cursor: null, submit: false };
 export function processMultilineKey(
   value: string,
   cursor: number,
-  key: MultilineKey,
+  keyIn: MultilineKey,
 ): MultilineAction {
-  // Parent-owned keys: Tab (slash-complete), Esc (abort), PageUp/Down.
-  if (key.tab || key.escape || key.pageUp || key.pageDown) {
+  // CSI recovery — bare `[A` / `[C` / `[Z` / `[5~` / etc. that
+  // Windows ConPTY leaves in `input` after parse-keypress eats the
+  // leading `\x1b`. See key-normalize.ts for the long version.
+  const recovered = recoverCsiTail(keyIn.input, keyIn);
+  const key: MultilineKey = recovered ? { ...keyIn, ...recovered, input: "" } : keyIn;
+
+  // Parent-owned keys: Tab (slash-complete), Esc (abort).
+  if (key.tab || key.escape) {
     return NOOP;
   }
 
-  // Empty buffer + ↑/↓ → parent handles history recall.
-  if (value.length === 0 && (key.upArrow || key.downArrow)) {
-    return NOOP;
+  // Buffer-wide navigation. Per-line motion (↑/↓ / Ctrl+A / Ctrl+E)
+  // is already covered; PageUp/PageDown are the missing "jump to
+  // top / bottom of the WHOLE buffer" pair, useful after pasting a
+  // 500-line blob where ↑×500 is absurd. Repurposed from the
+  // previous NOOP behavior (PageUp/Down had no binding).
+  if (key.pageUp) {
+    return cursor === 0 ? NOOP : { next: null, cursor: 0, submit: false };
+  }
+  if (key.pageDown) {
+    return cursor === value.length ? NOOP : { next: null, cursor: value.length, submit: false };
   }
 
-  // Cursor motion.
+  // History recall is bound to Ctrl+P / Ctrl+N (bash readline
+  // convention) rather than ↑/↓. Reason: Windows Terminal + ConPTY
+  // translates mouse wheel events to ↑/↓ keystrokes for raw-mode
+  // child processes — indistinguishable at the byte level. If ↑/↓
+  // recalled history, every wheel-scroll would corrupt the prompt
+  // with a prior message. Ctrl+P/N is wheel-immune.
+  if (key.ctrl && key.input === "p") {
+    return { ...NOOP, historyHandoff: "prev" };
+  }
+  if (key.ctrl && key.input === "n") {
+    return { ...NOOP, historyHandoff: "next" };
+  }
+
+  // Cursor motion. Empty single-line buffer + ↑/↓ is now a no-op
+  // (used to recall history; see Ctrl+P/N comment above).
   if (key.leftArrow) {
     return { next: null, cursor: Math.max(0, cursor - 1), submit: false };
   }
@@ -92,8 +104,58 @@ export function processMultilineKey(
   if (key.ctrl && key.input === "e") {
     return { next: null, cursor: endOfLine(value, cursor), submit: false };
   }
+  // Bash / readline conventions:
+  //   Ctrl+U — clear the whole buffer (readline treats this as
+  //     "clear from cursor to start"; for our text-area we treat it
+  //     as "clear all" because there's no ergonomic way to clear a
+  //     huge paste otherwise).
+  //   Ctrl+W — delete the word before the cursor.
+  if (key.ctrl && key.input === "u") {
+    return value.length === 0 ? NOOP : { next: "", cursor: 0, submit: false };
+  }
+  if (key.ctrl && key.input === "w") {
+    if (cursor === 0) return NOOP;
+    const wordStart = previousWordStart(value, cursor);
+    return {
+      next: value.slice(0, wordStart) + value.slice(cursor),
+      cursor: wordStart,
+      submit: false,
+    };
+  }
 
-  // Newline: Ctrl+J (LF literal) or ctrl+'j' normalized form.
+  // Paste-burst detection. If `input` contains a newline (or
+  // bracketed-paste markers from a terminal that supports them),
+  // this is a paste — surface it as a `pasteRequest` so the parent
+  // can register the blob and insert ONE sentinel codepoint instead
+  // of the full content. The buffer stays small + readable; the
+  // user sees `[paste #N · M lines]` where the paste lives.
+  //
+  // Always overrides `key.return` for pastes: Ink occasionally sets
+  // key.return when a paste's trailing \n looks like Enter, which
+  // would submit the partial buffer mid-paste and silently truncate
+  // the content. Pastes always insert; Enter only submits typed
+  // content. We normalize \r\n and bare \r to \n so mixed-line-
+  // ending pastes (Windows clipboard, web copy) land cleanly.
+  // Strip every recognised CSI fragment (paste markers, arrow tails,
+  // etc.) defensively — if any leaked past structured-key recovery
+  // they shouldn't get inserted into the buffer as text.
+  const stripped = stripCsiFragments(key.input);
+  // Paste = newline-containing input with MORE than just the newline
+  // itself. A bare "\n" is Ctrl+J / one-keystroke newline (handled
+  // below); only multi-char input wrapped around a newline is a real
+  // paste burst that warrants a sentinel.
+  const looksLikePaste =
+    stripped.length > 1 && (stripped.includes("\n") || stripped.includes("\r"));
+  if (looksLikePaste) {
+    const normalized = stripped.replace(/\r\n?/g, "\n");
+    return {
+      next: null,
+      cursor: null,
+      submit: false,
+      pasteRequest: { content: normalized },
+    };
+  }
+  // Single-char Ctrl+J / LF: insert one newline.
   if (key.input === "\n" || (key.ctrl && key.input === "j")) {
     return insertAt(value, cursor, "\n");
   }
@@ -148,11 +210,6 @@ function insertAt(value: string, cursor: number, insert: string): MultilineActio
   };
 }
 
-/**
- * Line + column of a cursor inside a buffer. Exported because the
- * renderer needs the same mapping for drawing the cursor block on the
- * right line.
- */
 export function lineAndColumn(value: string, cursor: number): { line: number; col: number } {
   let line = 0;
   let col = 0;
@@ -172,6 +229,14 @@ function startOfLine(value: string, cursor: number): number {
   return value.lastIndexOf("\n", cursor - 1) + 1;
 }
 
+/** Skips trailing whitespace first so Ctrl+W after a space still removes the previous word. */
+function previousWordStart(value: string, cursor: number): number {
+  let i = cursor;
+  while (i > 0 && /\s/.test(value[i - 1] ?? "")) i--;
+  while (i > 0 && !/\s/.test(value[i - 1] ?? "")) i--;
+  return i;
+}
+
 function endOfLine(value: string, cursor: number): number {
   const nl = value.indexOf("\n", cursor);
   return nl === -1 ? value.length : nl;

src/cli/ui/paste-collapse.ts

@@ -1,18 +1,5 @@
-/**
- * Collapse long user-typed input for display purposes.
- *
- * Problem: pasting a stack trace, log dump, or sample file into the
- * prompt box floods the Historical scrollback with a huge block — the
- * user can't see their previous turns, the assistant's replies, or
- * where the cursor is. Terminal UIs have shipped this shape for
- * years (iTerm's "pasted text" notation, Claude Code's preview).
- *
- * Split of concerns: the MODEL still gets the full text. This helper
- * only rewrites what we render in the Historical row. `@` expansions
- * and `!` bang outputs have their own display paths (unaffected).
- */
+/** Display-only — the MODEL always receives full paste text. */
 
-/** Defaults tuned to typical prose vs. typical code-paste shapes. */
 export const DEFAULT_PASTE_LINE_THRESHOLD = 40;
 export const DEFAULT_PASTE_CHAR_THRESHOLD = 2000;
 /** Lines kept visible at the head of a collapsed paste. */
@@ -35,19 +22,6 @@ export interface PasteCollapseResult {
   originalLines: number;
 }
 
-/**
- * Collapse `input` when it exceeds either the line OR char threshold.
- * Display shape:
- *
- *     ▸ pasted 2.3 KB (84 lines) — first 10 shown, full text sent to model
- *     line 1
- *     line 2
- *     …
- *     line 10
- *     … (74 more lines)
- *
- * Short input passes through unchanged — collapsed = false.
- */
 export function formatLongPaste(
   input: string,
   opts: PasteCollapseOptions = {},

src/cli/ui/paste-sentinels.ts

@@ -0,0 +1,81 @@
+/** PUA range U+E100..U+E1FF (BMP, no surrogate pairs) so each sentinel is one codepoint and cursor arithmetic stays trivial. */
+
+export const PASTE_SENTINEL_BASE = 0xe100;
+export const PASTE_SENTINEL_RANGE = 256;
+export const PASTE_SENTINEL_END = PASTE_SENTINEL_BASE + PASTE_SENTINEL_RANGE;
+
+export interface PasteEntry {
+  id: number;
+  content: string;
+  lineCount: number;
+  charCount: number;
+}
+
+export function encodePasteSentinel(id: number): string {
+  if (id < 0 || id >= PASTE_SENTINEL_RANGE) {
+    throw new Error(`paste sentinel id ${id} out of range [0, ${PASTE_SENTINEL_RANGE})`);
+  }
+  return String.fromCharCode(PASTE_SENTINEL_BASE + id);
+}
+
+/** Returns the paste id, or `null` if `ch` is not a sentinel codepoint. */
+export function decodePasteSentinel(ch: string): number | null {
+  if (ch.length === 0) return null;
+  const cp = ch.charCodeAt(0);
+  if (cp < PASTE_SENTINEL_BASE || cp >= PASTE_SENTINEL_END) return null;
+  return cp - PASTE_SENTINEL_BASE;
+}
+
+export function isPasteSentinel(ch: string): boolean {
+  return decodePasteSentinel(ch) !== null;
+}
+
+export function makePasteEntry(id: number, content: string): PasteEntry {
+  return {
+    id,
+    content,
+    lineCount: content.split("\n").length,
+    charCount: content.length,
+  };
+}
+
+/** Unknown sentinels drop to empty — never leak a PUA codepoint into the prompt. */
+export function expandPasteSentinels(
+  text: string,
+  pastes: ReadonlyMap<number, PasteEntry>,
+): string {
+  let out = "";
+  for (let i = 0; i < text.length; i++) {
+    const ch = text[i]!;
+    const id = decodePasteSentinel(ch);
+    if (id === null) {
+      out += ch;
+      continue;
+    }
+    const entry = pastes.get(id);
+    out += entry?.content ?? "";
+  }
+  return out;
+}
+
+export function bufferHasPaste(text: string): boolean {
+  for (let i = 0; i < text.length; i++) {
+    if (decodePasteSentinel(text[i]!) !== null) return true;
+  }
+  return false;
+}
+
+export function listPasteIdsInBuffer(text: string): number[] {
+  const ids: number[] = [];
+  for (let i = 0; i < text.length; i++) {
+    const id = decodePasteSentinel(text[i]!);
+    if (id !== null) ids.push(id);
+  }
+  return ids;
+}
+
+export function formatBytesShort(n: number): string {
+  if (n < 1024) return `${n}B`;
+  if (n < 1024 * 1024) return `${(n / 1024).toFixed(n < 1024 * 10 ? 1 : 0)}KB`;
+  return `${(n / (1024 * 1024)).toFixed(1)}MB`;
+}

src/cli/ui/presets.ts

@@ -1,47 +1,80 @@
-/**
- * One place that defines what each preset means. Both `slash.ts`
- * (in-chat `/preset`) and the wizard (first-run setup) read from here.
- *
- * Presets are the single vocabulary we teach new users: they don't need
- * to know model IDs, Pillar 2, branch budgets, or cost tradeoffs
- * independently — they pick "fast / smart / max" and we translate.
- */
+/** Preset table — branch and harvest stay off here so users never get ambushed into N× cost without opting in. */
 
 import type { PresetName } from "../../config.js";
 
 export interface PresetSettings {
   model: string;
+  reasoningEffort: "high" | "max";
+  autoEscalate: boolean;
+  /** Pillar-2 harvest. Always false in presets — opt-in via /harvest. */
   harvest: boolean;
-  /** Branch budget. `1` means branching off. */
+  /** Branch budget. Always 1 in presets — opt-in via /branch. */
   branch: number;
 }
 
-export const PRESETS: Record<PresetName, PresetSettings> = {
-  // `deepseek-chat` / `deepseek-reasoner` are retained as the fast /
-  // smart models because they're deprecated-but-working compat aliases
-  // for v4-flash's non-thinking and thinking modes respectively. Same
-  // billing, smaller config churn for existing users. `max` promotes
-  // to v4-pro — 12× flash on input/output, reserved for hard tasks.
-  fast: { model: "deepseek-chat", harvest: false, branch: 1 },
-  smart: { model: "deepseek-reasoner", harvest: true, branch: 1 },
-  max: { model: "deepseek-v4-pro", harvest: true, branch: 3 },
-};
-
-export const PRESET_DESCRIPTIONS: Record<PresetName, { headline: string; cost: string }> = {
-  fast: {
-    headline: "deepseek-chat (= v4-flash non-thinking), no harvest, no branching",
-    cost: "~1¢ per 100 turns · default",
+/** Old names `fast`/`smart`/`max` aliased via `resolvePreset` so legacy configs still load. */
+export const PRESETS: Record<"auto" | "flash" | "pro", PresetSettings> = {
+  // auto — flash baseline + auto-escalate to pro when the model emits
+  // <<<NEEDS_PRO>>> OR after 3+ tool failure signals in one turn.
+  // The default: cheap when easy, smart when hard.
+  auto: {
+    model: "deepseek-v4-flash",
+    reasoningEffort: "max",
+    autoEscalate: true,
+    harvest: false,
+    branch: 1,
   },
-  smart: {
-    headline: "deepseek-reasoner (= v4-flash thinking) + Pillar 2 harvest",
-    cost: "same price as fast · slower · better on multi-step tasks",
+  // flash — always flash, never escalate. `/pro` still arms a single
+  // manual turn; auto-promotion is the thing this disables. Use when
+  // you want predictable cost per turn.
+  flash: {
+    model: "deepseek-v4-flash",
+    reasoningEffort: "max",
+    autoEscalate: false,
+    harvest: false,
+    branch: 1,
   },
-  max: {
-    headline: "deepseek-v4-pro + harvest + self-consistency (3 branches)",
-    cost: "~30× cost vs fast · slowest · for hard single-shots",
+  // pro — always pro. Hard pin; the model never downgrades. Use for
+  // multi-turn architecture work where flash is just going to keep
+  // escalating anyway and the back-and-forth wastes turns.
+  pro: {
+    model: "deepseek-v4-pro",
+    reasoningEffort: "max",
+    autoEscalate: false,
+    harvest: false,
+    branch: 1,
   },
 };
 
+export const PRESET_DESCRIPTIONS: Record<
+  "auto" | "flash" | "pro",
+  { headline: string; cost: string }
+> = {
+  auto: {
+    headline: "flash → pro on hard turns",
+    cost: "default · ~96% turns stay on flash · pro kicks in only when needed",
+  },
+  flash: {
+    headline: "v4-flash always",
+    cost: "cheapest · predictable · /pro still works for a one-turn bump",
+  },
+  pro: {
+    headline: "v4-pro always",
+    cost: "~3× flash (5/31 discount) / ~12× full price · for hard multi-turn work",
+  },
+};
+
+/** Legacy aliases: fast→flash+high, smart→auto, max→pro. Unknown names fall through to auto. */
 export function resolvePreset(name: PresetName | undefined): PresetSettings {
-  return PRESETS[name ?? "fast"];
+  if (name === "auto" || name === "flash" || name === "pro") return PRESETS[name];
+  if (name === "fast") return { ...PRESETS.flash, reasoningEffort: "high" };
+  if (name === "smart") return PRESETS.auto;
+  if (name === "max") return PRESETS.pro;
+  return PRESETS.auto;
+}
+
+/** Canonical name for storage / display — unknown values become auto. */
+export function canonicalPresetName(name: PresetName | undefined): "auto" | "flash" | "pro" {
+  if (name === "auto" || name === "flash" || name === "pro") return name;
+  return "auto";
 }

src/cli/ui/primitives.tsx

@@ -0,0 +1,97 @@
+import { Text, useStdout } from "ink";
+// biome-ignore lint/style/useImportType: tsconfig jsx=react needs React in value scope for JSX compilation
+import React from "react";
+import { COLOR } from "./theme.js";
+
+/**
+ * Faint full-width horizontal rule. Width tracks the terminal columns
+ * minus 2 cells so it lines up exactly under content rendered inside
+ * a `paddingX={1}` parent — the standard chrome layout. Used by the
+ * top chrome bar, the replay StatsPanel, and the bottom ctx footer.
+ */
+export function ChromeRule(): React.ReactElement {
+  const { stdout } = useStdout();
+  const cols = stdout?.columns ?? 80;
+  const w = Math.max(20, cols - 2);
+  return <Text dimColor>{"─".repeat(w)}</Text>;
+}
+
+/** Compact binary-K formatter — `1234 → "1.2K"`, `131072 → "128K"`. */
+export function formatTokens(n: number): string {
+  if (n < 1024) return String(n);
+  const k = n / 1024;
+  return k >= 100 ? `${k.toFixed(0)}K` : `${k.toFixed(1)}K`;
+}
+
+/**
+ * Filled / empty progress bar. `▰▱` glyphs have distinct shapes so the
+ * boundary stays visible even when the terminal collapses to 8-color slots.
+ */
+export function Bar({
+  ratio,
+  color,
+  cells = 14,
+  dim,
+}: {
+  ratio: number;
+  color: string;
+  cells?: number;
+  dim?: boolean;
+}): React.ReactElement {
+  const filled = Math.max(0, Math.min(cells, Math.round(ratio * cells)));
+  return (
+    <Text>
+      <Text color={color} dimColor={dim}>
+        {"▰".repeat(filled)}
+      </Text>
+      <Text dimColor>{"▱".repeat(cells - filled)}</Text>
+    </Text>
+  );
+}
+
+/**
+ * `▣ ctx ▰▰▱▱…  14K/128K (11%)` — the canonical context-pressure cell.
+ * Used by the persistent footer (chat) and StatsPanel (replay). Color
+ * thresholds match the `/compact` warning policy in the loop:
+ *   green <60% · amber 60-80% · red ≥80% (with `· /compact` hint).
+ */
+export function ContextCell({
+  ratio,
+  promptTokens,
+  ctxMax,
+  showBar,
+}: {
+  ratio: number;
+  promptTokens: number;
+  ctxMax: number;
+  showBar?: boolean;
+}): React.ReactElement {
+  if (promptTokens === 0) {
+    return (
+      <Text>
+        <Text color={COLOR.info} dimColor>
+          {"▣ ctx "}
+        </Text>
+        <Text dimColor>— (no turns yet)</Text>
+      </Text>
+    );
+  }
+  const color = ratio >= 0.8 ? COLOR.err : ratio >= 0.6 ? COLOR.warn : COLOR.ok;
+  const pct = Math.round(ratio * 100);
+  return (
+    <Text>
+      <Text color={COLOR.info}>{"▣ ctx  "}</Text>
+      <Bar ratio={ratio} color={color} cells={showBar ? 14 : 10} />
+      <Text> </Text>
+      <Text color={color} bold>
+        {formatTokens(promptTokens)}/{formatTokens(ctxMax)}
+      </Text>
+      <Text dimColor> ({pct}%)</Text>
+      {ratio >= 0.8 ? (
+        <Text color={COLOR.err} bold>
+          {"  ·  /compact"}
+        </Text>
+      ) : null}
+    </Text>
+  );
+}

src/cli/ui/prompt-viewport.ts

@@ -0,0 +1,243 @@
+/** Slice each prompt line to a single visual row — Ink/Yoga wrap miscounts on CJK Windows terminals and leaks ghost rows. */
+
+import { type PasteEntry, decodePasteSentinel, formatBytesShort } from "./paste-sentinels.js";
+
+export type Segment = { kind: "text"; text: string } | { kind: "paste"; id: number; label: string };
+
+export interface Viewport {
+  /** Segments to render left-to-right. Sum of cells <= visibleCells. */
+  segments: Segment[];
+  /** `null` when cursor is not on this line. */
+  cursorCell: number | null;
+  /** True when content was clipped on the left side. */
+  hiddenLeft: boolean;
+  /** True when content was clipped on the right side. */
+  hiddenRight: boolean;
+}
+
+/** Treats Ambiguous=1 to match Ink/Yoga's own miscount — agreement matters more than correctness here. */
+export function charCells(ch: string): number {
+  if (ch.length === 0) return 0;
+  const code = ch.charCodeAt(0);
+  if (code < 0x20 || code === 0x7f) return 0;
+  if (code < 0x1100) return 1;
+  // Hangul Jamo
+  if (code >= 0x1100 && code <= 0x115f) return 2;
+  // CJK Radicals, Kangxi Radicals, Ideographic Description, CJK Symbols
+  if (code >= 0x2e80 && code <= 0x303e) return 2;
+  // Hiragana, Katakana, Bopomofo, Hangul Compat Jamo, Kanbun
+  if (code >= 0x3041 && code <= 0x33ff) return 2;
+  // CJK Unified Ext A
+  if (code >= 0x3400 && code <= 0x4dbf) return 2;
+  // CJK Unified Ideographs
+  if (code >= 0x4e00 && code <= 0x9fff) return 2;
+  // Yi Syllables
+  if (code >= 0xa000 && code <= 0xa4cf) return 2;
+  // Hangul Syllables
+  if (code >= 0xac00 && code <= 0xd7a3) return 2;
+  // CJK Compatibility Ideographs
+  if (code >= 0xf900 && code <= 0xfaff) return 2;
+  // CJK Compatibility Forms
+  if (code >= 0xfe30 && code <= 0xfe4f) return 2;
+  // Halfwidth and Fullwidth Forms (fullwidth half is wide)
+  if (code >= 0xff00 && code <= 0xff60) return 2;
+  // Fullwidth signs
+  if (code >= 0xffe0 && code <= 0xffe6) return 2;
+  return 1;
+}
+
+/** Total cells of a string, with paste sentinels expanded to placeholder width. */
+export function stringCells(s: string, pastes?: ReadonlyMap<number, PasteEntry>): number {
+  let n = 0;
+  for (let i = 0; i < s.length; i++) {
+    const ch = s[i]!;
+    const id = decodePasteSentinel(ch);
+    if (id !== null) {
+      n += pasteSentinelCells(id, pastes);
+    } else {
+      n += charCells(ch);
+    }
+  }
+  return n;
+}
+
+/** Paste sentinel placeholder width — what we'd render for that sentinel. */
+export function pasteSentinelLabel(id: number, entry: PasteEntry | undefined): string {
+  if (!entry) return `[paste #${id + 1} · (missing)]`;
+  return `[paste #${id + 1} · ${entry.lineCount}l · ${formatBytesShort(entry.charCount)}]`;
+}
+
+function pasteSentinelCells(id: number, pastes?: ReadonlyMap<number, PasteEntry>): number {
+  const entry = pastes?.get(id);
+  return pasteSentinelLabel(id, entry).length;
+}
+
+export function buildViewport(
+  line: string,
+  cursorCol: number | null,
+  visibleCells: number,
+  pastes?: ReadonlyMap<number, PasteEntry>,
+): Viewport {
+  if (visibleCells <= 0) {
+    return {
+      segments: [],
+      cursorCell: cursorCol === null ? null : 0,
+      hiddenLeft: false,
+      hiddenRight: line.length > 0,
+    };
+  }
+  const totalCells = stringCells(line, pastes);
+
+  // Fast path: whole line fits.
+  if (totalCells <= visibleCells) {
+    const segments = textToSegments(line, pastes);
+    let cursorCell: number | null = null;
+    if (cursorCol !== null) {
+      cursorCell = stringCells(line.slice(0, cursorCol), pastes);
+    }
+    return { segments, cursorCell, hiddenLeft: false, hiddenRight: false };
+  }
+
+  // Static viewport (cursor not on this line) — clip from the right.
+  if (cursorCol === null) {
+    return clipFromLeft(line, visibleCells, pastes);
+  }
+
+  // Cursor-bearing line: slide a window so cursor stays visible.
+  // Reserve 1 cell on each potentially-clipped side for the marker.
+  return clipAroundCursor(line, cursorCol, visibleCells, pastes);
+}
+
+function clipFromLeft(
+  line: string,
+  visibleCells: number,
+  pastes?: ReadonlyMap<number, PasteEntry>,
+): Viewport {
+  // Show as much of the head as fits; mark the right edge as hidden.
+  // Reserve 1 cell for the `›` marker.
+  const budget = Math.max(1, visibleCells - 1);
+  let used = 0;
+  let end = 0;
+  while (end < line.length) {
+    const ch = line[end]!;
+    const cw = charCellsAt(line, end, pastes);
+    if (used + cw > budget) break;
+    used += cw;
+    end++;
+  }
+  const segments = textToSegments(line.slice(0, end), pastes);
+  return { segments, cursorCell: null, hiddenLeft: false, hiddenRight: end < line.length };
+}
+
+function clipAroundCursor(
+  line: string,
+  cursorCol: number,
+  visibleCells: number,
+  pastes?: ReadonlyMap<number, PasteEntry>,
+): Viewport {
+  // `cursorCol` is between 0 and line.length (inclusive). The cursor
+  // visually sits BEFORE the char at line[cursorCol] (or after the
+  // last char when cursorCol === line.length).
+  // We want both the char at the cursor (if any) AND a cell of cursor
+  // padding visible.
+
+  // Budget — leave 1 cell for each marker we may need.
+  let budget = visibleCells;
+  // Right marker: needed if we don't reach end of line.
+  // Left marker: needed if start > 0.
+  // We don't know in advance, so allocate conservatively: -2 cells.
+  const reservedForMarkers = 2;
+  budget = Math.max(1, budget - reservedForMarkers);
+
+  // Try to keep cursor roughly centred. Start by aiming `start` ~
+  // halfway behind cursorCol.
+  const halfBudget = Math.floor(budget / 2);
+
+  // Walk left from cursor, accumulating cells, until we've spent
+  // halfBudget OR hit the start of the line.
+  let start = cursorCol;
+  let leftCells = 0;
+  while (start > 0 && leftCells < halfBudget) {
+    const cw = charCellsAt(line, start - 1, pastes);
+    if (leftCells + cw > halfBudget) break;
+    start--;
+    leftCells += cw;
+  }
+
+  // Walk right from cursor, filling the remaining budget. We always
+  // include a cell for the cursor itself if line[cursorCol] exists
+  // (since the cursor block covers that char). At end-of-line we
+  // include a phantom cell of cursor space.
+  const rightBudget = budget - leftCells;
+  let end = cursorCol;
+  let rightCells = 0;
+  // Include the char at the cursor (1 or 2 cells depending on width)
+  // if there is one.
+  const cursorChar = cursorCol < line.length ? charCellsAt(line, cursorCol, pastes) : 1;
+  if (rightBudget >= cursorChar) {
+    if (cursorCol < line.length) end = cursorCol + 1;
+    rightCells = cursorChar;
+    while (end < line.length && rightCells < rightBudget) {
+      const cw = charCellsAt(line, end, pastes);
+      if (rightCells + cw > rightBudget) break;
+      rightCells += cw;
+      end++;
+    }
+  }
+
+  // If we have leftover right-budget and there's still room on the
+  // left, expand leftwards more (cursor stays towards the right
+  // edge but more left context is shown — common when typing at
+  // end of a long line).
+  let extraLeftBudget = rightBudget - rightCells;
+  while (start > 0 && extraLeftBudget > 0) {
+    const cw = charCellsAt(line, start - 1, pastes);
+    if (cw > extraLeftBudget) break;
+    start--;
+    leftCells += cw;
+    extraLeftBudget -= cw;
+  }
+
+  const hiddenLeft = start > 0;
+  const hiddenRight = end < line.length;
+  const segments = textToSegments(line.slice(start, end), pastes);
+  // Cursor cell relative to the start of the slice. Markers are
+  // rendered separately by the caller — they don't shift the
+  // segment-relative offset so we don't add them here.
+  const cursorCell = stringCells(line.slice(start, cursorCol), pastes);
+  return { segments, cursorCell, hiddenLeft, hiddenRight };
+}
+
+function charCellsAt(line: string, idx: number, pastes?: ReadonlyMap<number, PasteEntry>): number {
+  const ch = line[idx]!;
+  const id = decodePasteSentinel(ch);
+  if (id !== null) {
+    const entry = pastes?.get(id);
+    return pasteSentinelLabel(id, entry).length;
+  }
+  return charCells(ch);
+}
+
+export function textToSegments(line: string, pastes?: ReadonlyMap<number, PasteEntry>): Segment[] {
+  const out: Segment[] = [];
+  let buf = "";
+  const flushBuf = () => {
+    if (buf.length > 0) {
+      out.push({ kind: "text", text: buf });
+      buf = "";
+    }
+  };
+  for (let i = 0; i < line.length; i++) {
+    const ch = line[i]!;
+    const id = decodePasteSentinel(ch);
+    if (id !== null) {
+      flushBuf();
+      const label = pasteSentinelLabel(id, pastes?.get(id));
+      out.push({ kind: "paste", id, label });
+    } else {
+      buf += ch;
+    }
+  }
+  flushBuf();
+  return out;
+}