feat: Calendar Agent + IoT Agent design + DB migration
- Deployed Calendar Agent (n8n ID: 4ZIEGck9n4l5qaDt)
- 12 Google Calendars via HA proxy, cron 06:30
- GPT-4.1 batch classification -> memory_facts
- Telegram daily briefing
- DB: added source_ref column + dedup index on memory_facts
- DB: created ha_sensor_config table (IoT Agent sensor allowlist)
- 9 seed entries (Pixel 10, Pixel Watch, EY HP, Spotify, GPS)
- README: full IoT Agent design documentation
- Sensor allowlist (regex), LLM-based activity inference
- Three-layer data flow, confidence-gated clarification
- README: Calendar Agent design + workflow diagram
- README: updated infra table, ADR broker, credentials
- CHANGELOG: Calendar Agent milestone
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>