docs: Round 13 Kickoff — Schema Change Detection (WU 2.4)

[supertrained]

Schema change detection: the #1 unsolved problem in autonomous agent infrastructure.

Deliverables

• Fingerprinting engine (capture response schema structure)
• Change detector (identify breaking/non-breaking changes)
• Alert pipeline (webhook, email, in-app dispatch)
• Proxy integration (non-blocking schema capture on every call)
• Admin endpoints + Supabase migration

Acceptance

• 40+ integration tests
• Zero regressions (239 Phase 2 tests still passing)
• Performance: <5ms fingerprinting, <10ms detection, async alerts
• Full operational tooling (admin endpoints, webhooks, config)

Timeline

• Thin-slice execution (Codex 5.3, 4 slices)
• Target: 50–60 min (single sub-agent run)
• Ready for Phase 3 GTM launch after this

See docs/PROXY-CORE-R13-SCHEMA-DETECTION.md for full spec.