test: harden OpenAI response error handling

PROJECT_STATE.md

@@ -7,11 +7,11 @@ ChatGPT MCP Server
 ## Status
 
 Planning complete.
-Phase 0 complete. Phase 1 complete. Phase 2 in progress.
+Phase 0 complete. Phase 1 complete. Phase 2 complete.
 
 ## Current Phase
 
-Phase 2 - OpenAI Integration
+Phase 3 — Not yet defined
 
 ## Completed Tasks
 
@@ -23,11 +23,8 @@ Phase 2 - OpenAI Integration
 - Task 1.4 — Safe logging helper (`src/utils/logging.js`) ✅
 - Task 2.1 — OpenAI client wrapper (`src/openai/client.js`) ✅
 - Task 2.2 — Response builder (`src/openai/responses.js`) ✅
+- Task 2.3 — Error handling and edge cases for OpenAI integration (tests) ✅
 
 ## Next Phase
 
-Phase 2 - OpenAI Integration
-
-## Next Pending Task
-
-Task 2.3 — Error handling and edge cases for OpenAI integration
+Phase 3 — Not yet defined