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    "orientation_convention": "front/back are assigned by signed displacement along normal = cross(col_tangent, row_tangent); names are arbitrary but chart-side consistent",
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    "run_argv": [
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    "tags": {
        "date_last_modified": "20260614185643016",
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    "triplet_direction_prior_mask_effective": "cond",
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    "triplet_slot_assignment": "per-point chart-side signed displacement",
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    "tta_merge_method_effective": "vector_geomedian",
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    "uuid": "752931_front"
}
