- Add comprehensive setup validation script with dependency checking
- Fix critical database initialization bug (missing _create_tables call)
- Complete requirements.txt with all missing dependencies
- Enhance CLI with better UX, input validation, and error handling
- Add automatic .env template generation
- Improve error handling throughout codebase
- Update documentation with better setup instructions
- Add detailed changelog for tracking improvements

This PR transforms the project from unreliable setup to production-ready
with clear guidance and graceful error handling.