{
  "artifact": "metadata-only protocol router (multinomial logistic regression)",
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      "note": "topic tags; unseen tags dropped"
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  "selection": "macro-F1 then excess-token-cost on DEV only, with validation-based early stopping",
  "leakage": "features are problem metadata only: no gold answers, no correctness, no protocol outcomes, no oracle label",
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    "sklearn_at_fit": "1.8.0 (from the InconsistentVersionWarning emitted on load)"
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