Stone.js API
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    Defines middleware (function, factory, or class) for the Stone.js kernel.

    This utility injects middleware metadata into the stone.kernel.middleware blueprint field. It supports functional, factory, and class-based middleware.

    The middleware implementation (function, factory, or class).

    Optional middleware options and factory indicator.

    A partial StoneBlueprint with the middleware metadata.

    defineMiddleware((event, next) => next(event))