Plugins panel shows stale version number after uninstall/reinstall + full app restart

Description
The Settings → Plugins panel displays an outdated version number for a plugin even after
uninstalling it, reinstalling the latest version, and fully quitting/reopening the app.

Steps to reproduce

1. Install a plugin from a marketplace (e.g. radd-ai-toolkit from a custom marketplace

pointing at a git repo).

1. Marketplace/plugin gets updated upstream to a newer version (e.g. 1.4.0).
2. Settings → Plugins still shows the old version (e.g. 1.2.0) with an "Update" button.
3. Click "Update" — button has no effect / stays on old version.
4. Uninstall the plugin entirely, reinstall it fresh, fully quit the app (not just the window),

reopen.

1. Settings → Plugins still shows the old version number (1.2.0).

Expected behavior
The Plugins panel should reflect the actually-installed version.

Actual behavior
Panel shows 1.2.0 while the on-disk install is confirmed correct at 1.4.0:

• ~/.claude/plugins/installed_plugins.json records version "1.4.0" with a fresh installedAt

timestamp matching the reinstall.

• ~/.claude/plugins/cache/<marketplace>/<plugin>/1.4.0/.claude-plugin/plugin.json confirms

version "1.4.0".

• ~/.claude/settings.json correctly enables the plugin.
• No stale 1.2.0 cache directory remains anywhere under ~/.claude/plugins.

This suggests the Settings UI reads plugin version metadata from a separate cache (not the
~/.claude/plugins state) that isn't invalidated by Update, uninstall, or app restart.

Environment

• Platform: macOS (Darwin 25.5.0)
• Plugin source: custom marketplace (git-based)