- GROUP_CHAT_MAX_CONTINUATIONS=2 caps continuation rounds independently of
the message cap, so pathological @mention chains can't consume the room's
whole budget on handoffs.
- unaddressedGroupMentions now orders by log INDEX instead of entry id:
ids are UUIDs (groupChatEntryId), not monotonic — string comparison could
both re-drive answered members and miss stranded ones.
- New unaddressed-mentions.test.mjs exercises the REAL function via the
vm-slice pattern (replacing concept-only helpers) and pins the ordering
fix with a UUID-vs-log-order case.
beplee
411f9c2f44