3 endpoints.

* [API Index](/docs/api-reference/contracts/api-index) — `GET /api/v1`\
  List backend API routes and response envelope metadata.
* [Contracts](/docs/api-reference/contracts/contracts) — `GET /api/v1/contracts`\
  Fetch artifact contract metadata.
* [OpenAPI](/docs/api-reference/contracts/openapi) — `GET /api/v1/openapi.json`\
  Fetch OpenAPI 3.1 contract.