refactor: consolidate naming from opencode to agent-core

- Change comments and commands in new code to use "agent-core"
- Rename OAUTH_DUMMY_KEY to agent-core-oauth-dummy-key
- Add AGENT_CORE_TEST_HOME env var (with OPENCODE_TEST_HOME compat)
- Keep external service URLs (opencode.ai, antigravity.opencode.ai)
- Keep OPENCODE_* flags for upstream compatibility

Part of technical debt cleanup (Phase 7).

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

packages/agent-core/src/auth/index.ts

@@ -4,7 +4,7 @@ import fs from "fs/promises"
 import z from "zod"
 import { Log } from "../util/log"
 
-export const OAUTH_DUMMY_KEY = "opencode-oauth-dummy-key"
+export const OAUTH_DUMMY_KEY = "agent-core-oauth-dummy-key"
 
 // Buffer time before expiry to trigger refresh (10 minutes)
 const REFRESH_BUFFER_MS = 10 * 60 * 1000

packages/agent-core/src/global/index.ts

@@ -12,9 +12,9 @@ const state = path.join(xdgState!, app)
 
 export namespace Global {
   export const Path = {
-    // Allow override via OPENCODE_TEST_HOME for test isolation
+    // Allow override for test isolation (AGENT_CORE_TEST_HOME preferred, OPENCODE_TEST_HOME for compat)
     get home() {
-      return process.env.OPENCODE_TEST_HOME || os.homedir()
+      return process.env.AGENT_CORE_TEST_HOME || process.env.OPENCODE_TEST_HOME || os.homedir()
     },
     data,
     bin: path.join(data, "bin"),

src/index.ts

@@ -1,7 +1,7 @@
 /**
  * Agent Core - Unified AI Agent Foundation
  *
- * Powers Stanley (GUI/GPUI), Zee (WhatsApp/Telegram), and OpenCode (CLI/TUI)
+ * Powers Stanley (GUI/GPUI), Zee (WhatsApp/Telegram), and agent-core (CLI/TUI)
  * with subscription-based auth support (Claude Max, ChatGPT Plus, GitHub Copilot).
  *
  * ## Architecture Overview

src/surface/cli.ts

@@ -2,7 +2,7 @@
  * CLI/TUI Surface Adapter
  *
  * Terminal-based interaction with streaming text output and interactive permission prompts.
- * Designed for OpenCode and similar terminal-based agent interfaces.
+ * Designed for agent-core and similar terminal-based agent interfaces.
  */
 
 import { createInterface, type Interface as ReadlineInterface } from 'node:readline';

src/wezterm/workspace.lua

@@ -32,7 +32,7 @@ function M.spawn_drone_pane(window, persona)
     cwd = M.config.agent_core_path,
   })
 
-  drone_pane:send_text(string.format("opencode --agent %s\n", persona))
+  drone_pane:send_text(string.format("agent-core --agent %s\n", persona))
   return drone_pane
 end