[P2] Supabase(Hermes) 경로 테스트 부재

[kimdzhekhon]

근거

• rg learning-supabase __tests__ → 0건. prod DB_PROVIDER=supabase인데 lease guard·failed_validation·match_memories·retry 경로가 정적 확인뿐
• sqlite 경로만 jest 커버

수정

• Supabase client mock으로:
  • runReflectionWithClaim invalid→error→(MAX)failed_validation
  • markError/failed_validation의 lease expired no-op(.gt lease guard)
  • match_memories p_stale_days 전달
  • reserveReflection/listPendingReflections

[kimdzhekhon]

수정: https://github.com/kimdzhekhon/Quorum/commit/e8fb8d0 — tests/lib/learning-supabase.test.ts 신규(mock client). reflection invalid→error→(MAX)failed_validation, lease guard, match_memories p_stale_days 커버.