7806425ba6
Adds tests/contracts/test_openapi_baseline.py which loads the live FastAPI app and diffs its OpenAPI schema against a checked-in baseline. Fails on: - Any removed path or operation - Any removed response status code on an existing operation - Any new required request body field (would break existing clients) Passes silently on additive changes. The baseline is regenerated by running tests/contracts/regenerate_baseline.py — only when a contract change has been reviewed and every consumer (admin-compliance, developer-portal, SDKs) has been updated in the same change set. This is the safety harness for the Phase 1 backend-compliance refactor: every subsequent refactor commit must keep this test green. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>