[KAJdev]

Native API routes accepted parameters that requests could not populate.

@app.api()
class Search:
    @get("/search")
    def search(self, q="hello"):
        return {"q": q}

GET /search?q=world returned {"q": "hello"} because native handlers did not bind query parameters. Required parameters could fail with HTTP 500, and body annotations did not validate fields.

Now native declarations require literal paths and instance methods with no input, or one required positional JSON-object argument for POST, PUT, PATCH, and DELETE. Unsupported signatures and schema annotations fail during application import with guidance to use a FastAPI factory.

Request-body handling is covered by the companion runtime PR #13. Both releases are needed for the complete contract.

Refs CON-2064.

[justinwlin]

Looks good. The check matches what the runtime can call, and the tests fail without the change. Two notes inline, not blocking.

[promptless]

Promptless documentation updates

• docs(sdk): Document native @app.api route signature rules and FastAPI apps documents the route signature rules for @app.api classes in "Build an app", adds a FastAPI app alternative, and updates "Known differences" in "Migrating from Flash".