api/inventions/v1/creatorIds was a stub returning an empty list, so the
watch's GetCreatorIdsOfInventionsInRoom never learned which creators it
must request invention permissions for before spawning a room's
invention-based geometry. Resolve the real set from
InventionEntity.CreationRoomId and factor the room->inventions lookup the
/room endpoint already used into a shared ResolveRoomInventionsAsync
helper (direct matches unioned with the imported cluster). ByRoom now
calls the helper too. creatorIds returns List<int> of distinct creator
account ids.
Alexa
fad8d81961