feat: Phase 4 - session and reminder tools
Add multi-agent session coordination and reminder management:
- store.rs: Added sessions and reminders tables (schema v2)
- handlers/session.rs: Session ping (start/heartbeat/end) + list
- handlers/reminder.rs: Reminder CRUD with gates, snoozing, clearing
- voice.rs: Added info() function for informational messages
- state.rs: Added for_test() helper with test-helpers feature
New MCP tools (6):
- blue_session_ping, blue_session_list
- blue_reminder_create, blue_reminder_list
- blue_reminder_snooze, blue_reminder_clear
Total: 28 MCP tools, 21 tests passing
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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