Add comprehensive CORS configuration section to CLAUDE.md including:
- Implementation patterns with From<CorsSettings> trait
- Development and production configuration examples
- Security constraints and fail-safe defaults
- Test coverage documentation (15 tests)
- Updated project structure showing CORS-related files
- Updated technology stack and active specification list
Updated tasks.md to reflect Phase 0.5 completion (T009-T016).
Phase: 0.5 - CORS Configuration & Production Security (Complete)