Draw the Navara CCTV frame and viewshed in the depth-tested opaque scene so walls hide them

Navara's transparent pass runs after the post effects without the scene depth, so a camera frame clamped in front of a wall still painted through it. scripts/qa-edge-cctv-occlusion.mjs serves a one-box tileset as a local fixture with no network and checks on both engines that the frame ends at the wall and is not visible behind it.

src/layers/cctv/render/navaraMeshes.js

@@ -46,8 +46,12 @@ export function createCctvNavaraMeshes(engine, { view, MeshDesc }) {
           super(owner, ctx, config);
           this.cctv = config[KIND];
         }
+        // The opaque scene draws after the scene depth is copied into its
+        // target, so walls and terrain hide the frame and volume; Navara's
+        // transparent pass runs after the effects without that depth and
+        // painted them through (scripts/qa-edge-cctv-occlusion.mjs).
         getPassKey() {
-          return 'transparent';
+          return 'opaque';
         }
         createMesh() {
           return this.cctv.group;

src/layers/cctv/render/navaraMeshes.test.mjs

@@ -28,7 +28,8 @@ function harness() {
       }
       const kind = Object.keys(config)[0];
       const desc = new (kinds.get(kind))(view, {}, config);
-      assert.equal(desc.getPassKey(), 'transparent');
+      // Depth-tested against the scene: the frame must not paint through walls.
+      assert.equal(desc.getPassKey(), 'opaque');
       const object = desc.createMesh();
       scene.add(object);
       const handle = {