Tests expose:
1. DM Engine ignores dm_reply.enabled config (checks nonexistent 'disable_ai_messaging')
2. Logs 'Successfully sent' without verifying actual Send button click
3. Generates garbage replies from 'No previous context' (story replies)
4. No max-iteration guard — sent 20 messages in test, 8 in production
All 4 tests FAIL. Ready for GREEN phase.