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      "confidence": 0.6,
      "note": "no opaque primary button found",
      "needs_review": true
    },
    "stack": {
      "source": "dom",
      "confidence": 0.85,
      "note": "globals, script URLs and response headers"
    },
    "meta": {
      "source": "dom",
      "confidence": 0.99
    },
    "sections[].bbox": {
      "source": "dom",
      "confidence": 0.8
    },
    "sections[].kind": {
      "source": "dom",
      "confidence": 0.65,
      "note": "class-name and content-count heuristics; per-section confidence in sections[].confidence",
      "needs_review": true
    },
    "imagery.media_share": {
      "source": "dom",
      "confidence": 0.8
    },
    "imagery.dominant_colors": {
      "source": "pixels",
      "confidence": 0.7,
      "note": "clustered screenshot pixels inside media boxes (approximate, OKLab ΔE 0.06 clusters)"
    }
  }
}