Allow customizing companion name and appearance

Feature Request

Currently the companion (Chiseled the bunny) has a hardcoded name and appearance. It would be great to allow users to customize:

• Name — rename the companion via settings.json or config
• Appearance — optionally change the ASCII art

Use case

Personalization. Users who spend a lot of time in Claude Code may want to give their companion a custom name.

Suggested implementation

A setting in settings.json like:

{
  "companion": {
    "name": "MyBuddy"
  }
}