Generates an OpenAPI 3.0 specification from bootgs @RestController classes via static TypeScript AST analysis (not runtime reflection), and documents the DTO-first contract workflow between a bootgs backend and its client. Use when adding or changing a bootgs endpoint, keeping openapi.json in sync with controllers, or generating a typed client from a bootgs backend. Not for writing the client that consumes the spec or for debugging a route miss (`bootgs-client`), nor for entry-point wiring (`bootgs-quickstart`).
