Feature Request: Companion (Murmur) appearance customization

Feature Request

Allow users to customize the appearance of the Murmur companion penguin — specifically, adding accessories like hats, scarves, or other cosmetic options.

Motivation

The companion is a delightful touch in the Claude Code experience. Being able to personalize its appearance (e.g., giving it a hat) would make the tool feel more personal and fun.

Suggested Implementation

A companion key in settings.json or a dedicated config file, e.g.:

{
  "companion": {
    "accessory": "hat",
    "style": "tophat"
  }
}

Or a set of unlockable/selectable cosmetics in the UI.

Context

Currently there is no configuration surface for the companion's appearance — it's entirely built-in with no customization options.