Add setting to disable companion (Larder ghost)

Request

Add a companionEnabled: boolean field to settings.json so users can disable the Larder companion ghost globally.

Why

• The companion adds visual noise to the input box without providing workflow value
• There is currently no way to turn it off -- claude config set --global companionEnabled false fails because the field doesn't exist in the schema
• Power users who spend long sessions in Claude Code would benefit from a distraction-free option

Suggested implementation

Add to the settings schema:

{
  "companionEnabled": {
    "description": "Whether to show the companion ghost (Larder) in the input box (default: true)",
    "type": "boolean"
  }
}

Then respect the setting in the UI layer that renders the companion.

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