Feature request: allow customizing the Companion (buddy)

Summary

Currently the Companion (Clotch, the mushroom) is a fixed UI element with no configuration options. It would be great to allow users to customize or change it — choosing a different character, name, or personality.

Motivation

The Companion adds personality to the CLI experience, but different users might prefer different buddies. Customization would make the experience feel more personal.

Suggested approach

A setting in settings.json or via /config to choose or configure the companion, e.g.:

{
  "companion": {
    "character": "cat",
    "name": "Mochi"
  }
}

Or even just a selection from a preset list of companions.

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