fix: compute clouds from planned route so destruction cannot leak (review)

src/sim/npc.js

@@ -97,6 +97,9 @@ export function planNpc(world, npc) {
   npc.plan = {
     id: planId, good: best.good, qty: best.qty,
     originPlanet: origin.id, destPlanet: best.dest.id,
+    // Planned route (public knowledge for clouds) — unlike legs, never
+    // truncated by a hidden 'destroyed' roll.
+    routeLanes: best.route.lanes, startSys: origin.systemId,
     startTime: t, ...itin,
   };
   npc.state = 'transit';