feat: register remaining MCP tools

PROJECT_STATE.md

@@ -7,7 +7,7 @@ ChatGPT MCP Server
 ## Status
 
 Planning complete.
-Phase 0 complete. Phase 1 complete. Phase 2 complete. Phase 3 complete. Task 4.1 complete. Task 4.2 complete. Task 4.3 complete. Task 4.4 complete. Task 4.5 complete. Phase 4 complete. Task 5.1 complete. Task 5.2 complete.
+Phase 0 complete. Phase 1 complete. Phase 2 complete. Phase 3 complete. Task 4.1 complete. Task 4.2 complete. Task 4.3 complete. Task 4.4 complete. Task 4.5 complete. Phase 4 complete. Task 5.1 complete. Task 5.2 complete. Task 5.3 complete.
 
 ## Current Phase
 
@@ -54,7 +54,24 @@ Phase 5 - MCP Server and Tool Registration
   - tools/call (invalid API key) → structured MCP error `"OpenAI API error (OpenAIAuthError): 401"` ✅
   - All 523 unit tests pass across 18 test files ✅
 
-- Task 5.3 — Register remaining MCP tools (NEXT)
+- Task 5.3 — Register remaining MCP tools ✅
+
+  **Registered tools:**
+  - `review_plan` → handleReviewPlan
+  - `review_code` → handleReviewCode
+  - `debug_issue` → handleDebugIssue
+  - `architecture_review` → handleArchitectureReview
+
+  **All five MCP tools now registered:** ask_chatgpt, review_plan, review_code, debug_issue, architecture_review.
+  
+  **Smoke test results (all passing):**
+  - initialize → server returns `chatgpt-mcp` v0.1.0 ✅
+  - tools/list → 5 tools total ✅
+  - tools/call reaches handlers for all 5 tools ✅
+  - missing OPENAI_API_KEY → structured tool errors (`"Error: Configuration error: OPENAI_API_KEY is missing."`) ✅
+  - npm test → 523 tests pass across 18 test files, no regressions ✅
+
+- Task 5.4 — Normalize MCP tool error formatting (NEXT)
 
 ## Phase 3 Completion Summary
 
@@ -107,4 +124,4 @@ All five tool handlers are implemented and tested:
 
 ## Next Pending
 
-### Task 5.3 - Register remaining MCP tools (review_plan, review_code, debug_issue, architecture_review)
+### Task 5.4 - Normalize MCP tool error formatting