Wrap the generated LiveView with Tribes.Plugin.Layouts.app and mount optional host auth so new plugins render inside the replaceable Tribes chrome by default. Keep ui@1 in the manifest and document that host chrome, direct UI imports, and use Tribes.UI all require the UI provider capability.
Add the shared plugin helper, host-backed test config, and runtime validation entrypoint. Update the example plugin route/docs and replace the old standalone test suite with the host-backed contract and page tests.
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