{
  "taskId": "W-013",
  "viewport": {"width": 1440, "height": 900},
  "screenshot": "three-viewport-1440x900.png",
  "browser": "Google Chrome headless with SwiftShader",
  "checks": ["Three.js WebGL2 适配器", "Perspective camera", "OrbitControls", "grid", "lit cube"]
}