Group chats could be created but never deleted — the only way out was
manually ungrouping every member, which still left the shared room log
in plugin storage forever.
The group-chat workspace header now has a trash button behind a
ConfirmDialog. Disband is soft: it clears every member's group
assignment (syncs cross-machine via ui_meta), drops the room log from
the atom and the persisted group-chats map, clears the needs-you badge,
and closes the room view. The members' per-group gateway sessions
("Group: <name>") are intentionally kept and remain reachable from each
bot's session browser. A room with a drive still in flight leaves a
runtime-only epoch-bumped tombstone so the round-robin loop bails at its
next member boundary; the tombstone is never persisted.
Teknium
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