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  "parameter_method": "Election-block delete-one jackknife, capped at 3 margin points; only active if earlier probability tests pass.",
  "feature_missingness": {
    "current_older_presidential_missing": 173,
    "current_prior_candidate_available": 266
  },
  "limitations": [
    "Districts without older same-map presidential results fall back to their recent-election lean and zero trend; no different-map substitution.",
    "Candidate residuals use prior ordinary D/R House contests and identified names; missing history is not presumed inexperience.",
    "No full model-selection posterior or untouched 2024 holdout is claimed.",
    "The unpolled-only deployment variant was added during development after inspecting the full enhancement; it is not a predeclared confirmatory test."
  ]
}