Stone.js API
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    authzBlueprint: AuthzBlueprint = ...

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

    It contributes the authz service provider and a kernel middleware that builds the current principal's ability and attaches it to every request. Both stone.providers and stone.kernel.middleware are arrays, so this merges with the rest of the app. Configure stone.authz.resolveAbility to build abilities from your users; guard routes with authorize(action, subject).