Plugin uninstall/marketplace removal leaves orphaned cache directories

Description

When a plugin is uninstalled or a marketplace is removed, the corresponding cache directories under ~/.claude/plugins/cache/ are not cleaned up. Over time this accumulates stale plugin data that can cause confusion during debugging and wastes disk space.

Repro

1. Install a marketplace with plugins (e.g., sefirot-marketplace with brando, bad, etc.)
2. Observe cache created at ~/.claude/plugins/cache/sefirot-marketplace/brando/1.1.0/
3. Uninstall the plugin: /plugin → remove brando
4. Check cache: ls ~/.claude/plugins/cache/sefirot-marketplace/brando/ → still exists
5. Remove the entire marketplace: /plugin → remove sefirot-marketplace
6. Check cache: ls ~/.claude/plugins/cache/sefirot-marketplace/ → still exists with all plugin dirs

Also observed:

• Renamed marketplace leaves old cache behind (e.g., fabula-marketplace/ cache persists after marketplace was renamed to sefirot-marketplace)
• Renamed plugin source directories leave old cache entries (e.g., bad-plugin/ cache persists after source renamed to bad/)

Expected

• Plugin uninstall removes the corresponding cache directory
• Marketplace removal removes the entire marketplace cache directory
• claude plugin update cleans up stale cache entries that no longer match the marketplace source

Actual

Cache directories persist indefinitely. Manual rm -rf is required to clean up.

Environment

• Claude Code 2.1.81
• Linux (OrbStack)

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