Upgrade Plugin

Upgrade a plugin's skills, hooks, and patterns to align with the latest Claude Code capabilities, model features, and skill-writing best practices.

Arguments: $ARGUMENTS -- plugin name (e.g., creator-stack, scheduler) and optional focus areas. If no plugin specified, ask which one.

Locate Target Plugin

Find the plugin to upgrade:

1. Check <cwd>/<plugin-name>/.claude-plugin/plugin.json (source mode -- marketplace repo)
2. If not found, check ~/.claude/plugins/cache/*/<plugin-name>/ (installed mode)

If neither found, list available plugins and ask the user to clarify.

Set PLUGIN_ROOT to the resolved path.