[FEATURE] List subcommand for plugins

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

If you want to see which plugins you have installed.

I can get to that via the enable or disable flags:

<img width="1253" height="295" alt="Image" src="https://github.com/user-attachments/assets/193cfc57-cfa1-4343-9f6c-fdf900691571" />

But there's no equivalent of

claude mcp list

Which I would have expected to exist to just show the plugins i have installed maybe in a format that shows the markplace from which they were installed too

Proposed Solution

My usual workflow would be:

• See which plugins I have
• See what to keep/remove

Subcommand:

claude plugins list

To provide that showing plugin list and marketplace associations

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_