0.5x bounty PKO push/fold chart

A half-size bounty barely changes the maths from a plain ICM bubble: the immediate payout for busting the villain is small next to the pay jump itself, so this chart sits close to the bounty-free ICM range. It is the baseline to compare the wider factors against — if a jam looks about the same here as on a straight ICM chart, the bounty is not doing much yet.