- Add avatar field to hosts.json config for Neko and Mochi
- Create HostContext to provide host config to components
- Display host avatar and name in chat messages instead of generic Claude
- Add user avatar and first name to user messages
- Include avatar in /api/hosts endpoint response
- Fix appendFileSync import for debug logging
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
