V2.2 Hardening Sprint - Release Note

Delivered:
1. Supabase-backed atomic task state machine (worker.py)
2. End-to-end 7-stage project lifecycle proof
3. QA layer with 5 check types + per-check reporting
4. Heartbeat direct to Supabase every 15s
5. Claude API execution (haiku/sonnet/opus model selection)
6. Skills enforcement blocking mismatched agent-task pairs

All items proven with real execution on mac-mini-01.