- Fix broken unit test for auth tool validation
- Remove unnecessary macOS-only OS restriction for cross-platform compatibility
- Improve CI process reliability with separate test execution
- All 33/33 tests now pass on multiple platforms
- Enhanced test coverage for credentials, cache, and learning systems

Features:
- Comprehensive unit test coverage (33 tests)
- Cross-platform compatibility (Windows, macOS, Linux)
- Reliable CI/CD pipeline
- Secure credential and token management
- OAuth flow with CSRF protection
- Cache system with proper permissions
- Learning system integration