emergency: add vehicle debug output

vendor/clouds3d.js

@@ -3669,6 +3669,17 @@ function updateEmergencyVehicles(now) {
         emergencyPts[pi++] = v.seed; emergencyPts[pi++] = route.len;
     }
     emergencyCount = pi / 10;
+    window.__emergencyVehiclesDebug = [];
+    for (var d = 0; d < emergencyVehicles.length; d++) {
+        var vv = emergencyVehicles[d], rr = emergencyRoutes[vv.route];
+        if (!rr) continue;
+        window.__emergencyVehiclesDebug.push({
+            routeKm: +(rr.lenKm).toFixed(1),
+            progressKm: +(vv.d * KM_PER_TILE).toFixed(1),
+            dir: vv.dir,
+            seed: +vv.seed.toFixed(3)
+        });
+    }
     return emergencyCount;
 }