v3.11.0 - Mentions, Markdown Styling & UX Polish

Major Features:
- Full Markdown styling support for Signal messages (bold, italic, strikethrough, spoiler, monospace)
- Proper Signal @mentions throughout verification flow
- Multi-source display name resolution (DB → Cache → Signal API)
- !inquire command for Q&A follow-up questions
- Research Tools integration for enhanced news analysis

@Mentions Now Work In:
- !request @NewUser - New user gets notified
- Verification "Do you vouch?" - Voucher gets notified
- Group welcome messages - Voucher mentioned
- Breakout room joins - New member mentioned
- Entry/INDOC welcome - New member + voucher mentioned

Improvements:
- deploy.sh now syncs compose.yml and verifies env vars
- Fixed textStyles parameter (was textStyle) for signal-cli
- Display name extraction from mention text (not just DB)
- Breakout room DMs with catch-up summaries

Database:
- 013_add_qa_inquiries.sql - Q&A inquiry tracking

Documentation:
- Wiki: Text Formatting page added
- Phase 2 Roadmap created (ROADMAP_PHASE_2.md)
- UX Guide compliance tracking

Bug Fixes:
- Question hash FK instead of question_id
- Various build fixes for attachments/sendMessage