This commit addresses issues found during review of PRs #12 and #28:
## PR #12 (Auth Error Handling) Fixes
- Create shared auth.py module with centralized AUTH_ERROR_PATTERNS,
is_auth_error(), and print_auth_error_help() functions
- Fix start.bat to use directory check instead of outdated
.credentials.json file check (matching start.sh behavior)
- Update process_manager.py to import from shared auth module
- Update start.py to import from shared auth module
- Update documentation comments in autonomous_agent_demo.py and
client.py to remove references to deprecated .credentials.json
## PR #28 (Feature Management) Improvements
- Add _priority_lock threading lock to feature_mcp.py to prevent
race conditions when multiple features are created simultaneously
- Apply lock to feature_create, feature_create_bulk, and feature_skip
- Add checkAndSendTimeoutRef cleanup in useAssistantChat.ts to
prevent memory leaks on component unmount
- Clear currentAssistantMessageRef on response_done
## Code Quality
- All Python files pass ruff linting
- All security tests pass (91/91)
- UI passes ESLint and TypeScript compilation
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
