Complete rewrite of the support bot to stateless architecture:
- State derived from group composition + chat history (survives restarts)
- Card dashboard in team group with live status, preview, /join commands
- Two-profile architecture (main + Grok) with profileMutex serialization
- Grok join race condition fix via bufferedGrokInvitations
- Card preview: newest-first truncation, newline sanitization, sender prefixes
- Best-effort startup (invite link, group profile update)
- Team group preferences: directMessages, fullDelete, commands
- 122 tests across 27 suites
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Narasimha-sc