Enhance SmartFlow AI with production-ready features
- Implement actual MCP connector classes with OAuth support
- Enforce mandatory secrets at startup with fail-fast validation
- Add comprehensive scenario-specific integration tests with pytest
- Harden prompt handling with Gemini safety blocks and input sanitization
- Demonstrate A2A communication between generated agents
- Fix Unicode encoding issues for Windows terminal compatibility
- Add proper error handling and retry logic throughout
- Include deployment configurations and environment variables