@claude slash commands show in local chat window

<img width="377" height="357" alt="Image" src="https://github.com/user-attachments/assets/c3590207-b664-4fcd-9ed2-4182a810420c" />

I know there is a fake participant and we might need some new concept of how the claude agent gets plugged in. cc @joshspicer or whoever owns the infra