ICM

Harville placement and win probabilities, expected payouts from a prize vector, top-k and last-place conveniences, and pairwise bubble factors from payout finite differences.

Stack inputs are chip counts; payouts length must match player count. Not the same as normalizedStackFractions (raw chip share only).

Stacks (and some outputs) accept Float64Array and optional returnFormat: 'float64'. See Float64 ICM input.

Export	Summary
icmWinProbabilitiesHarville	First-place probabilities.
icmHarvillePlacementProbabilities	Full n×n placement matrix.
icmTopKFinishProbabilities	P(finish in top k).
icmLastPlaceProbabilitiesHarville	P(finish last).
icmExpectedPayouts	Expected $ per seat.
icmPairwiseBubbleFactor	Loss/gain ratio on payouts.
icmExpectedPayoutsWeitzman	Independent chip-utility ICM (stack^alpha).
icmEqualChopPayouts	Equal split of prize pool per seat.
icmTotalPrizePool	Sum of payout ladder.
icmDealEvPerChip	ICM $EV divided by stack.
icmSatelliteAdvanceProbability	Per-seat probability of cashing satellite.
icmPayoutStructureGini	Inequality index of payout ladder.