Add headless wgpu vision and camera controls

crates/metacrate-grid-agent/src/vision_tests.rs

@@ -120,6 +120,27 @@ async fn golden_scene_is_deterministic_depth_ordered_and_privacy_marked() {
     assert!(pixels[center + 1] > 180 && pixels[center] < 80 && pixels[center + 2] < 80);
 }
 
+#[cfg(feature = "live-grid")]
+#[tokio::test(flavor = "multi_thread")]
+async fn offscreen_wgpu_renders_depth_ordered_scene_when_an_adapter_is_available() {
+    let Ok(renderer) = WgpuRenderer::new().await else {
+        return;
+    };
+    let limits = VisionLimits {
+        width: 64,
+        height: 64,
+        minimum_interval: std::time::Duration::ZERO,
+        ..VisionLimits::default()
+    };
+    let rgba = tokio::task::spawn_blocking(move || renderer.render(&scene(), limits))
+        .await
+        .expect("render worker")
+        .expect("offscreen render");
+    assert_eq!(rgba.len(), 64 * 64 * 4);
+    let center = (32 * 64 + 32) * 4;
+    assert!(rgba[center + 1] > 180 && rgba[center] < 80 && rgba[center + 2] < 80);
+}
+
 #[tokio::test]
 async fn invalid_camera_huge_scene_stale_generation_and_size_limit_fail_closed() {
     let mut bad = scene();
@@ -332,7 +353,7 @@ async fn responder_adds_generic_image_payload_and_returns_summary_on_capability_
         .await
         .unwrap();
     assert!(response.as_str().contains("does not support visual input"));
-    assert!(response.as_str().contains("Synthetic viewport"));
+    assert!(response.as_str().contains("Reconstructed viewport"));
     assert_eq!(*endpoint.parts.lock().unwrap(), 3);
 }