Two fixes:
1. Remove assistant prefill from team task reminders. The injected
[user]+[assistant]+[user] pattern caused LLMs to treat the canned
ack as "turn complete", returning NO_REPLY for every user message
in group sessions with active tasks. Reminders are now merged into
the user message as prefix tags.
2. Add PeerKind propagation to team notification routing. TaskTicker
and progress notifications were missing PeerKind on InboundMessage,
causing them to route to phantom DM sessions instead of the correct
group session. PeerKind is now carried through event payloads,
notify queue metadata, and all inbound message publications.