feat: v0.8.0 — player-actions API: accept/dispatch/buy/sell/refuel endpoints (tick-first, full-snapshot responses), spawn coverage rule, test create-contract hook

app/api/planes/[planeId]/refuel/route.ts

@@ -0,0 +1,11 @@
+import { performAction, refuelPlane } from '@/lib/game/actions';
+
+// POST /api/planes/:planeId/refuel (v0.8.0) — no body. Fills a grounded plane to
+// maxFuel at the fuel price per missing liter; deducts the cost from cash. 404
+// unknown id; 409 if the plane is flying or cash is insufficient. On success
+// returns the full state snapshot (fuel back to max, cash reduced by the cost).
+
+export async function POST(_req: Request, ctx: { params: Promise<{ planeId: string }> }) {
+  const { planeId } = await ctx.params;
+  return performAction((inst) => refuelPlane(inst, planeId));
+}