Brings in `ChatRoom.joinedGroupAt` and the pre-join indexing gate, plus schema
v15. No conflict: mantra's only edit to `MarmotOutboundDao` is in
`createMlsDirectMessageChatRoom`, stamping the new column as it builds the
ChatRoom, and every line of this branch's is further down -- `inviteMember`,
`addMembersToChatRoom`, `deliveryWelcome` and the three new announce helpers.
The two changes do meet in one place, and it is worth saying why nothing had to
be done about it. `MIGRATION_14_15` deletes transcript lines, which is exactly
the sort of thing that could quietly eat the lines this branch adds. It cannot:
the delete is scoped to `ChatMessage.UNRESOLVED_MARMOT_TYPES` and to rows whose
`marmotGroupEventId` names an event older than the room, and a membership line
is neither -- it is not a placeholder for an event still to come, and it has no
group event behind it at all. Nor could it ever be in reach, because these lines
are written by the *inviter*, whose own room has no epoch predating them.
828 tests pass -- 526 jvm, 302 android. The six new ones are this branch's.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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