- Integration of ruff, eslint, prettier for consistent code style - Global error handling and structured logging in backend - Comprehensive testing strategy with 100% pass rate (33 backend, 2 frontend) - Graceful handling of missing Gemini API key (non-blocking startup) - New /settings/status endpoint and UI warning indicators - Full documentation update (ARCHITECTURE.md, CONTRIBUTING.md, README.md, GEMINI.md) - Restored missing frontend logic and fixed UI syntax errors
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