- Make user_id required on all request models with field validators
- Always include user_id in WHERE clause for chunk queries (prevents cross-user data leak)
- Add bearer token auth on all endpoints except /health
- Add composite index on (user_id, room_id) for conversation_chunks
- Bot: guard query_chunks with sender check, pass room_id, send auth token
- Docker: pass MEMORY_SERVICE_TOKEN to both bot and memory-service
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>