OptionalcurrentOptionalisOptionallatestOptionalmessageOptionalprocessingOptionaltotalOptionaltypeOptionalwaitingThe room is idle pending the human agent's input.
True while a human holds the floor, and also true for an idle room with no speaker, nothing queued and nothing in flight — including the moment between a message being accepted and processing starting. So it answers "may the human send something", not "is the human being asked something". For the latter, compare currentSpeaker against the human's nickname.
Discriminates this from RoomErrorUpdate on the same channel.