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  "png_asset_presence": "3000/3000",
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  "reference_frame_audit": "Dataset-specific geometry and question frames are documented in the generator/validator; no implicit frame conversion is introduced by this audit.",
  "scalar_scene_features": [
    "azimuth_convention",
    "azimuth_exclusion_degrees",
    "coordinate_frame",
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    "has_inconsistent_shadow",
    "inconsistent_object_index",
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    "num_objects"
  ]
}