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    "rearfoot_alignment_note": "Rear-view proxy from video keypoints."
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  "coverage": {
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    "sam3d_ankle_metric_valid_coverage": 1.0,
    "sam3d_heel_metric_valid_coverage": 1.0,
    "sam3d_rearfoot_metric_valid_coverage": 1.0
  },
  "note": "Video-derived movement context."
}