[DOCS] Admit that claude-code isn't open source.

Documentation Type

Unclear/confusing documentation

Documentation Location

github

Section/Topic

open source

Current Documentation

Make it clear that claude-code isn't open source instead of making a github to pretend it's open source.

Wasted time trying to find references to env vars before I realised this repo is just a stub of a repo.

What's Wrong or Missing?

The README doesn't say that claude code isn't part of the repo that it is only pretending to be the code of claude code.

Suggested Improvement

Just be honest and say "Claude code CLI is closed source, this repo just contains plugins and readme, not the actual source code."

Impact

Medium - Makes feature difficult to understand

Additional Context

_No response_