Stone.js API
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    authBlueprint: AuthBlueprint = ...

    Opt-in blueprint: import and register it to enable authentication.

    It contributes the auth service provider and a kernel middleware that authenticates every request from its Bearer token (populating event.getUser() when present). Both stone.providers and stone.kernel.middleware are arrays, so this merges with the rest of the app. Configure keys/issuer/audience under stone.auth; enforce access per route with requireAuth() / requireScopes().