- Implemented HubSnapshot and central HubStateStore for normalized in-memory state caching (<0.05ms)
- Refactored AccountsView and RoutingView with reusable AccountCardWidget and RoutingRoleWidget to eliminate widget recreation
- Implemented central HermesRefreshScheduler with 5s tick, concurrency throttling, dedup, and spread initial delays
- Added typed EventBus with thread-safe UI main loop dispatching via root.after
- Implemented dynamic ModelRegistry with capability-based role requirements and multi-dimensional scoring
- Integrated Antigravity separate quota buckets (Claude vs Gemini) and same-account model fallback
- Enhanced SessionAffinityTracker with TTL expiration and LRU capacity bounds
- Eliminated long subprocess holding of _CM_LOCK and ensured Windows credential restoration in finally block
- Added FastAPI REST contracts in gui_server.py as foundation for future Tauri frontend
- Verified 100% pass across all 91 pytest tests and 7/7 release gate criteria
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