🐧 Emperor Penguin Dive Lab: Breath-Hold, Buoyancy and Foraging Trips Beneath the Ice

Steer one emperor penguin on a foraging trip in a split above/below-water polar scene: swim against the buoyant air in the feathers, manage a breath-hold oxygen budget and the aerobic dive limit, hunt a fish school and decide when to leave (marginal value theorem), dodge a leopard seal, then walk home and feed the chick. Real equations, a deterministic seed, three levels, CSV/JSON export and eight independent checks.