Plugin cloning via menu (#6433)

* Add plugin cloning via menu

* Split plugin commands by action

* Keep plugin enablement in action commands

* Remove unused plugin edit command

* Simplify plugin rescan arguments

* Assume Omarchy shell is running for plugin commands

* Remove plugin compatibility dispatcher

* Flatten plugin clone command

* Keep only shared plugin helpers

* Remove plugin rescan wrapper

* Keep plugin commands self-contained

* Simplify plugin clone lifecycle

shell/plugins/bar/README.md

@@ -180,4 +180,4 @@ Third-party widgets ship as separate plugins under
 declaring `kinds: ["bar-widget"]` and a `barWidget` entry point. See
 [../../README.md](../../README.md) for the manifest schema. Enable,
 rescan, and place third-party plugins with `omarchy plugin enable`,
-`omarchy plugin rescan`, and `omarchy bar plugin add`.
+`omarchy-shell shell rescanPlugins`, and `omarchy bar plugin add`.