docs: add project roadmap

Covers:
- Phase 1: Foundation (providers, config)
- Phase 2: Personas (Zee, Stanley, Johny features)
- Phase 3: Shared infrastructure (Qdrant, orchestration)
- Phase 4: TUI improvements
- Phase 5: Upstream sync

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/ROADMAP.md

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+# Agent-Core Roadmap
+
+## Current State
+
+Agent-core is a fork of OpenCode with three personas (Zee, Stanley, Johny) sharing orchestration and memory layers.
+
+### What Works
+- [x] Provider system with Antigravity, Cerebras, OpenRouter
+- [x] Three personas with Tab switching
+- [x] Config symlinks for global access
+- [x] OAuth auth for Anthropic and Google
+- [x] Built-in antigravity models (Claude, Gemini)
+
+---
+
+## Phase 1: Foundation (Current)
+
+### 1.1 Provider Stability
+- [x] Fix Antigravity model registration (use built-in `antigravity-*` models)
+- [x] Disable redundant Vertex providers
+- [x] Document provider setup (`docs/PROVIDERS.md`)
+- [ ] Auto-refresh OAuth tokens before expiry (not just on-demand)
+- [ ] Add provider health checks in TUI
+
+### 1.2 Config Management
+- [x] Symlink global config to project config
+- [ ] Single source of truth for agent definitions (remove duplication)
+- [ ] Config validation on startup
+- [ ] Migration tool for config schema changes
+
+---
+
+## Phase 2: Personas
+
+### 2.1 Zee (Personal Assistant)
+- [ ] Qdrant memory integration
+  - [ ] Store conversation summaries
+  - [ ] Semantic search across memories
+  - [ ] Key facts extraction
+- [ ] Messaging integration
+  - [ ] WhatsApp via whatsapp-web.js
+  - [ ] Telegram gateway
+  - [ ] Discord integration
+- [ ] Calendar integration
+  - [ ] Google Calendar sync
+  - [ ] Smart scheduling
+
+### 2.2 Stanley (Investing)
+- [ ] OpenBB integration for market data
+- [ ] Portfolio tracking
+  - [ ] Position management
+  - [ ] P&L tracking
+  - [ ] Risk metrics (VaR)
+- [ ] SEC filings analysis
+- [ ] NautilusTrader backtesting integration
+
+### 2.3 Johny (Learning)
+- [ ] Knowledge graph implementation
+  - [ ] Topic DAG with prerequisites
+  - [ ] Mastery level tracking
+- [ ] Spaced repetition (MathAcademy-inspired)
+  - [ ] Ebbinghaus decay modeling
+  - [ ] FIRe (Fractional Implicit Repetition)
+- [ ] Study session management
+  - [ ] Deliberate practice
+  - [ ] Interleaving
+
+---
+
+## Phase 3: Shared Infrastructure
+
+### 3.1 Memory System
+- [ ] Qdrant vector storage setup
+- [ ] Conversation continuity across compactions
+- [ ] Cross-persona memory sharing
+- [ ] Memory search MCP tool
+
+### 3.2 Orchestration (Tiara)
+- [ ] Drone spawning via Task tool
+- [ ] WezTerm pane management
+- [ ] SPARC methodology integration
+- [ ] Background task status tracking
+
+### 3.3 MCP Servers
+- [ ] Context7 integration (done)
+- [ ] Custom MCP for personas
+  - [ ] Memory MCP
+  - [ ] Calendar MCP
+  - [ ] Portfolio MCP
+
+---
+
+## Phase 4: TUI Improvements
+
+### 4.1 Model Selection
+- [ ] Favorites system
+- [ ] Recently used models
+- [ ] Provider status indicators (auth valid/expired)
+- [ ] Cost display for non-free models
+
+### 4.2 Agent Experience
+- [ ] Agent-specific themes/colors
+- [ ] Persistent agent state across sessions
+- [ ] Agent handoff (delegate to another persona)
+
+### 4.3 Conversation
+- [ ] Better compaction summaries
+- [ ] Conversation branching
+- [ ] Export conversations
+
+---
+
+## Phase 5: Upstream Sync
+
+### 5.1 Merge Strategy
+- [ ] Track upstream OpenCode releases
+- [ ] Maintain patch set for agent-core customizations
+- [ ] Automated conflict detection
+
+### 5.2 Divergence Points
+- Built-in agents removed (only personas)
+- Config paths changed to agent-core
+- Custom provider transforms
+- Persona-specific skills
+
+---
+
+## Backlog
+
+### Nice to Have
+- [ ] Voice input/output
+- [ ] Mobile companion app
+- [ ] Multi-user support
+- [ ] Plugin marketplace for personas
+
+### Technical Debt
+- [ ] Remove "opencode" references in new code
+- [ ] Type safety for persona configs
+- [ ] Test coverage for provider transforms
+- [ ] E2E tests for auth flows
+
+---
+
+## Contributing
+
+When working on roadmap items:
+1. Create a branch: `feat/phase-X.Y-description`
+2. Update this roadmap with progress
+3. Add documentation to `docs/`
+4. Test with all three personas