Skill audit report

api Audit report.

Use to derive the API contract for a feature — an OpenAPI 3.1 document at docs/features/{slug}/contracts/openapi.yaml plus a drift/sync report (and an events doc when the feature has async flows). Triggers on "api for {slug}", "openapi for {slug}", "API contract for {slug}", "lock the interface for {slug}", "events for {slug}", "/sdd:api {slug}", "контракт API для {slug}", "OpenAPI для {slug}", "опиши ендпоінти". The contract is never hand-written: it is a derived function of data-model.md (typed fields + constraints), the sad.md §6 sequence diagrams (error branches, async actors), and spec.md acceptance criteria. Runs an inline drift check (does the contract match the model and the sequences?) and a reconcile mode. Hard-refuse if data-model.md is missing AND the feature changes the schema → run `data-model {slug}` first; on a legal no-schema-change skip it derives from the existing schema instead.