Add kitchen sink plugin example

packages/plugins/examples/plugin-kitchen-sink-example/README.md

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+# @paperclipai/plugin-kitchen-sink-example
+
+Kitchen Sink is the first-party reference plugin that demonstrates nearly the full currently implemented Paperclip plugin surface in one package.
+
+It is intentionally broad:
+
+- full plugin page
+- dashboard widget
+- project and issue surfaces
+- comment surfaces
+- sidebar surfaces
+- settings page
+- worker bridge data/actions
+- events, jobs, webhooks, tools, streams
+- state, entities, assets, metrics, activity
+- local workspace and process demos
+
+This plugin is for local development, contributor onboarding, and runtime regression testing. It is not meant as a production plugin template to ship unchanged.
+
+## Install
+
+```sh
+pnpm --filter @paperclipai/plugin-kitchen-sink-example build
+pnpm paperclipai plugin install ./packages/plugins/examples/plugin-kitchen-sink-example
+```
+
+Or install it from the Paperclip plugin manager as a bundled example once this repo is built.
+
+## Notes
+
+- Local workspace and process demos are trusted-only and default to safe, curated commands.
+- The plugin settings page lets you toggle optional demo surfaces and local runtime behavior.
+- Some SDK-defined host surfaces still depend on the Paperclip host wiring them visibly; this package aims to exercise the currently mounted ones and make the rest obvious.