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        "median_gap_days": null,
        "principals": []
      }
    ],
    "note": "Silence is measured from the Leaders tracker (days since a sourced public statement). “Unusual” needs a few weeks of history of each lab’s own gap; until then a gap of 7+ days is marked long, not unusual. Scored after the fact against what shipped next once releases land in the newsroom."
  }
}
