fix(city): correct traffic signal orientation for right-hand traffic

- Fix vehicle signal head rotation to face approaching traffic correctly
- Refactor pedestrian signal positioning with descriptive naming
- Add getSignalHeads() method for snapshotting signal state
- Add cache-busting query parameter to app.js script tag

public/js/city/app.js

@@ -556,13 +556,15 @@ function initTrafficLights(g) {
             group.add(pole);
 
             // Mast arm over the vertical road (northbound lane), facing
-            // south so approaching traffic sees the signal.
+            // south so approaching traffic sees the signal. Northbound
+            // drives on the east half (right-hand traffic); the SE-corner
+            // pole sits on that same (right) side.
             const armNS = new THREE.Mesh(new THREE.BoxGeometry(0.12, 0.1, 2.2), poleMat);
             armNS.position.set(x + sw, 4.0, z + sw - 1.1);
             group.add(armNS);
             const headNS = makeSignalHead();
             headNS.position.set(x + sw, 3.7, z + sw - 2.2);
-            headNS.rotation.y = Math.PI; // face -Z (south)
+            headNS.rotation.y = 0; // face +Z (south — toward northbound traffic)
             group.add(headNS);
             heads.push({ head: headNS, axis: 'z' });
 
@@ -578,23 +580,30 @@ function initTrafficLights(g) {
 
             // Pedestrian signals: short posts on the same corner, well
             // inside the sidewalk, facing the crosswalks they control.
-            const pedZ = makePedSignal();
-            const pedZPole = new THREE.Mesh(new THREE.CylinderGeometry(0.05, 0.06, 2.4, 6), pedPoleMat);
-            pedZPole.position.set(x + sw + 0.6, 1.2, z + sw - 0.6);
-            group.add(pedZPole);
-            pedZ.position.set(x + sw + 0.6, 2.5, z + sw - 0.6);
-            pedZ.rotation.y = Math.PI; // faces south crosswalk
-            group.add(pedZ);
-            pedHeads.push({ head: pedZ, axis: 'z' });
+            //
+            // The east crosswalk crosses the horizontal (x) road, so its
+            // signal follows the x-axis vehicle state. It sits on the east
+            // sidewalk facing north, for walkers arriving from the north.
+            const pedEast = makePedSignal();
+            const pedEastPole = new THREE.Mesh(new THREE.CylinderGeometry(0.05, 0.06, 2.4, 6), pedPoleMat);
+            pedEastPole.position.set(x + sw + 0.6, 1.2, z + sw - 0.6);
+            group.add(pedEastPole);
+            pedEast.position.set(x + sw + 0.6, 2.5, z + sw - 0.6);
+            pedEast.rotation.y = Math.PI; // faces north (approach from the north)
+            group.add(pedEast);
+            pedHeads.push({ head: pedEast, axis: 'x' });
 
-            const pedX = makePedSignal();
-            const pedXPole = new THREE.Mesh(new THREE.CylinderGeometry(0.05, 0.06, 2.4, 6), pedPoleMat);
-            pedXPole.position.set(x + sw - 0.6, 1.2, z + sw + 0.6);
-            group.add(pedXPole);
-            pedX.position.set(x + sw - 0.6, 2.5, z + sw + 0.6);
-            pedX.rotation.y = -Math.PI / 2; // faces west crosswalk
-            group.add(pedX);
-            pedHeads.push({ head: pedX, axis: 'x' });
+            // The south crosswalk crosses the vertical (z) road, so its
+            // signal follows the z-axis vehicle state. It sits on the south
+            // sidewalk facing west, for walkers arriving from the east.
+            const pedSouth = makePedSignal();
+            const pedSouthPole = new THREE.Mesh(new THREE.CylinderGeometry(0.05, 0.06, 2.4, 6), pedPoleMat);
+            pedSouthPole.position.set(x + sw - 0.6, 1.2, z + sw + 0.6);
+            group.add(pedSouthPole);
+            pedSouth.position.set(x + sw - 0.6, 2.5, z + sw + 0.6);
+            pedSouth.rotation.y = -Math.PI / 2; // faces west (approach from the east)
+            group.add(pedSouth);
+            pedHeads.push({ head: pedSouth, axis: 'z' });
         }
     }
 
@@ -4329,6 +4338,64 @@ window.__city10 = {
         if (trafficSystem) trafficSystem.setPhase(name);
         return this.trafficPhase;
     },
+    /**
+     * Snapshot of every signal head (position, facing, axis and the lamp
+     * currently lit) so automated tests can assert placement and states.
+     */
+    trafficLightHeads() {
+        if (!trafficSystem) return { vehicle: [], pedestrian: [] };
+        const vehicle = trafficSystem.heads.map(({ head, axis }) => {
+            const intensities = head.userData.lamps.map(
+                l => +l.material.emissiveIntensity.toFixed(2)
+            );
+            const active = ['red', 'yellow', 'green'][intensities.indexOf(Math.max(...intensities))];
+            return {
+                axis,
+                x: +head.position.x.toFixed(2),
+                y: +head.position.y.toFixed(2),
+                z: +head.position.z.toFixed(2),
+                rotationY: +head.rotation.y.toFixed(3),
+                active,
+                intensities,
+            };
+        });
+        const pedestrian = trafficSystem.pedHeads.map(({ head, axis }) => {
+            const red = +head.userData.lamps.red.material.emissiveIntensity.toFixed(2);
+            const green = +head.userData.lamps.green.material.emissiveIntensity.toFixed(2);
+            return {
+                axis,
+                x: +head.position.x.toFixed(2),
+                y: +head.position.y.toFixed(2),
+                z: +head.position.z.toFixed(2),
+                rotationY: +head.rotation.y.toFixed(3),
+                active: red > green ? 'red' : 'green',
+            };
+        });
+        return { vehicle, pedestrian };
+    },
+    /**
+     * Per-vehicle stop-line probe: travel axis, distance to the next stop
+     * line and current speed, for red-light compliance checks.
+     */
+    trafficProbe() {
+        if (!vehicleSystem) return [];
+        const out = [];
+        for (const v of vehicleSystem.vehicles) {
+            if (!v.pts) continue;
+            const probe = probeAhead(v.pts, v.s, v.L);
+            const cur = new THREE.Vector3();
+            posOnPath(v.pts, v.s, v.L, cur);
+            out.push({
+                x: +cur.x.toFixed(2),
+                z: +cur.z.toFixed(2),
+                speed: +(v.speed || 0).toFixed(2),
+                axis: probe.axis,
+                distToStop: +distanceToStopLine(probe, cur).toFixed(2),
+                state: trafficSystem ? trafficSystem.axisState(probe.axis) : null,
+            });
+        }
+        return out;
+    },
     playerCrossingAllowed,
     get barriersDown() { return trainSystem ? trainSystem.blocks : null; },
     setHour(h) {

resources/views/city/viewer.blade.php

@@ -372,5 +372,5 @@
         citySlug: @json($city->slug),
     };
 </script>
-<script type="module" src="{{ asset('js/city/app.js') }}"></script>
+<script type="module" src="{{ asset('js/city/app.js') }}?v={{ filemtime(public_path('js/city/app.js')) }}"></script>
 @endpush