/api/v1. Authenticate with a scoped bearer token or an interactive owner session; credential management and trace replay require an interactive owner session. Errors use { "error": { "code": "...", "message": "..." } }.
GET /healthz is the unauthenticated infrastructure liveness probe and returns { "ok": true }. It is outside the application API contract.
See authentication for access setup and OpenAPI definition for downloading or regenerating the contract.