Plugin marketplace/ecosystem not updating properly, persists after reinstall (macOS)

Description

On macOS, the plugin marketplace and skill/plugin ecosystems do not update properly. The stale state persists even after a full reinstall of the app — suggesting the cache or ecosystem state is stored outside the app bundle and survives reinstall.

Steps to Reproduce

1. Open Claude Code for Mac
2. Navigate to the plugin marketplace or ecosystem panel
3. Observe that plugins/skills appear outdated or fail to reflect the latest state
4. Uninstall and reinstall the app
5. Reopen — ecosystem state remains stale

Expected Behavior

• Plugin marketplace should fetch and display the latest available plugins/skills on load or on manual refresh
• A reinstall should reset any cached ecosystem state and start fresh

Actual Behavior

• Marketplace/ecosystem shows stale or incorrect data
• Reinstalling the app does not resolve the issue — state survives the reinstall

Environment

• Platform: macOS
• App: Claude Code (desktop/Mac)

Additional Context

The fact that reinstall does not clear the state suggests ecosystem/marketplace data is cached outside the app bundle (e.g., in ~/Library/Application Support/, ~/Library/Caches/, or similar user-scoped directories). A full reset path (manual cache clear or a "Reset ecosystem" option in settings) would help as a workaround.