{
  "search": {"title": "店舗案内", "description": "店舗の説明"},
  "og": {"title": "秋のキャンペーン", "description": "開催案内", "url": "https://example.invalid/offer", "type": "website", "image": null},
  "image_state": "missing",
  "relative_image_resolution": "https://example.invalid/assets/offer.png",
  "unknown": ["image reachability", "SNS cache", "authentication/public access", "real SNS preview"]
}