packages/chat: verify, test, and fix #2166
Description
Package: packages/chat
Description: Chat system for NodeTool — conversation management and message handling.
Current State
- Source files: ~10
- Test files: ~5
- Known issues: None identified from scan
Tasks
- Review all source files for placeholder/stub code
- Verify conversation and message handling is complete
- Run full test suite, fix any failures
- Add tests for untested source files
- Verify chat history persistence and retrieval
Acceptance Criteria
- All tests pass
- No placeholder or stub code remains
- All public APIs have test coverage