feat: v0.12.0 — contracts → packages: load/fly/abandon gameplay (ATR 72-600 capacity 6, manual flight to any airport, time-scaled abandon penalty 15–60%), one-time DB migration preserving wallet/clock; new endpoints /api/packages/:id/load|abandon + /api/planes/:planeId/fly

lib/game/penalty.ts

@@ -0,0 +1,32 @@
+// Abandon penalty (v0.12.0) — dropping a loaded package costs a fraction of its
+// payout that grows with time pressure: 15% right after creation, up to 60% at
+// the deadline. Pure function shared by the server action (lib/game/actions.ts)
+// and the client-side preview in components/RightPane.tsx so both always agree.
+
+export const ABANDON_PENALTY_MIN = 0.15; // fraction of the payout, at creation time
+export const ABANDON_PENALTY_SPAN = 0.45; // added across the package's lifetime → max 60% at the deadline
+
+// The penalty fraction for a given elapsedFraction ∈ [0, 1] (clamped).
+export function abandonPenaltyPct(elapsedFraction: number): number {
+  const f = Math.min(1, Math.max(0, elapsedFraction));
+  return ABANDON_PENALTY_MIN + ABANDON_PENALTY_SPAN * f;
+}
+
+// How much of the package's lifetime has elapsed at clockMs (clamped to [0, 1]).
+export function elapsedFractionFor(createdSimTime: number, deadlineSimTime: number, clockMs: number): number {
+  const span = deadlineSimTime - createdSimTime;
+  if (span <= 0) return 1; // degenerate — treat as fully elapsed (max penalty)
+  return Math.min(1, Math.max(0, (clockMs - createdSimTime) / span));
+}
+
+// The exact € penalty for abandoning `pkg` at game time clockMs. An already-
+// EXPIRED package abandons for free; cash is floored at 0 by the caller
+// (account.cash = max(0, cash − penalty)). Rounded to cents like all money math.
+export function abandonPenalty(
+  pkg: { status: string; reward: number; createdSimTime: number; deadlineSimTime: number },
+  clockMs: number,
+): number {
+  if (pkg.status === 'expired') return 0;
+  const pct = abandonPenaltyPct(elapsedFractionFor(pkg.createdSimTime, pkg.deadlineSimTime, clockMs));
+  return Math.round(pkg.reward * pct * 100) / 100;
+}