Two bugs in concluded discussion channel handling:
1. before_model_resolve did not check rec.discussion.concluded, so it
still initialized the speaker list and ran turn management. Fixed by
returning NO_REPLY early for concluded discussions (same as report mode).
2. message_received fired for all agent VM contexts, causing multiple
"This discussion is closed" auto-replies per incoming message. Fixed
with process-level dedup keyed on channelId:messageId (same pattern
as agent_end runId dedup). Also fixed message_id extraction to look
in metadata.conversation_info.message_id first.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
hzhang
9e61af4a16