Function createDomainCost

Build a MoveCostFn that enforces a movement domain, delegating the per-cell prices to landCost / navalCost. The returned function is what findPath, getMovementRange, and computeFlowField all take, so one unit type's rules are written once and shared by every search.

const shipCost = createDomainCost({ map, isLiquid: world.isWater, domain: 'naval' });
const path = findPath(from, to, shipCost, map);
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