V2.2 Hardening Sprint - RELEASED 2026-03-24

1. Supabase Migration: PROVEN - all state durable
2. Heartbeat: PROVEN - 15s intervals, LIVE badges
3. Claude API: PROVEN - haiku execution, 203 tokens
4. QA Layer: PROVEN - 6 check types + browser
5. Skills: PROVEN - enforcement blocks unauthorized
6. E2E Proof: PROVEN - 7 stages, 7 artifacts