- New packages/kaya-openapi with OpenAPIMixin, @operation decorator,
and generate_spec() that walks the routing tree
- Enables kaya-core's Tree.register to expose the original handler
callback as an instance attribute for metadata introspection
- Registers GET /openapi.json and GET /docs (Swagger UI) routes
- Supports and path parameters, docstring
descriptions, @operation metadata, and excludes wildcard/WS routes
- Adds example/openapi.py, updates CI, README, and requirements