Summary

• GitHub App Integration: Full OAuth flow with installation management, encrypted token storage (AES-GCM), webhook handling, and app-authenticated API access for fetching repository source files
• Live Mode Enhancements: New handshake visualization component, improved live handlers and service with source-file-aware endpoint diffing, and better real-time contract reconciliation
• Diff Engine Improvements: Enhanced endpoint matching algorithm with method+path scoring, better field-level comparison, and expanded test coverage
• Settings Page Overhaul: Redesigned settings UI with GitHub App connection management alongside existing API key and model configuration
• CI/CD: Added Vercel frontend deploy workflow via GitHub Actions
• Cleanup: Removed unused analyzer interface methods and simplified GitHub fetcher and file discovery logic

Test plan

• Verify GitHub App OAuth installation flow end-to-end
• Test webhook handling for installation events
• Confirm live mode handshake visualization renders correctly
• Validate diff engine produces accurate endpoint matches with the new scoring
• Run go test ./pkg/diff/... to verify new diff engine tests pass
• Check settings page loads and manages GitHub App connections
• Verify deploy workflow triggers on push to main