Companion customization: allow choosing different buddy animals

Feature Request

The current companion (Slattox the cat) is a fun addition, but it would be great to have the option to choose a different companion animal — or at least a different species.

Use case: Not everyone is a cat person. I'd love a German Shepherd Dog (GSD) as my console buddy. A setting in ~/.claude/settings.json or similar to pick from a few companion options would be appreciated.

Suggested approach:

• A configurable companion setting (species/breed selection)
• Even just a few options (cat, dog, etc.) would go a long way
• Bonus: an option to disable the companion entirely for those who prefer a clean UI

Thanks for a great product — just want to personalize it a bit more.