docs: refresh README for MVP completion

AGENT_HANDOFF.md

@@ -116,9 +116,17 @@ MCP tool error formatting normalized in `src/server.js`. All 5 tool registration
 
 Smoke tests: npm test 523 passed ✅ · tools/list 5 tools ✅ · ask_chatgpt single prefix ✅ · review_plan single prefix ✅
 
+### Task 5.5 - Claude Code MCP configuration and local end-to-end setup ✅
+
+Project-local Claude Code discovery configured:
+- `.claude/` added to `.gitignore` — no machine-specific paths in repo
+- README.md updated with Setup, MCP Tools, and Running sections
+- MCP config uses `"command": "npm"`, `"args": ["start"]` — platform-independent
+- All 5 tools documented: `ask_chatgpt`, `review_plan`, `review_code`, `debug_issue`, `architecture_review`
+
 ## Next Pending
 
-### Task 5.5 - Claude Code MCP configuration and local end-to-end setup
+N/A — all planned tasks complete.
 
 ## General Rules