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        "std": 12.516897669659494
      },
      "type": "numeric",
      "unit": null
    }
  ],
  "versions": {
    "content": "1.0.0",
    "schema_protocol": "2.0"
  },
  "warnings": [
    "conversion: Y.csv has no 'observation_id'; assumed Y/M row pairing and attached M.csv IDs. M observation order matches X.csv.",
    "conversion: variables: dropped duplicate columns ['chemical_formula_sum'] (kept the first source's values)."
  ]
}