ICM & side pots

ICM (Harville)

Start with icmWinProbabilitiesHarville and icmExpectedPayouts. Placement matrices and bubble factors are under the ICM API category.

For chip-utility ICM (independent Weitzman model, stack^alpha), use icmExpectedPayoutsWeitzman instead of Harville placement math.

Side pots

sidePotLadderFromCommitments builds layers; layeredPotChipEvFromEquities assigns chip EV per player per layer.