{
  "future_rows": 6300,
  "backtest_rows": 4410,
  "source_additivity_checks": 86,
  "max_source_country_difference": 0.0,
  "max_future_point_additivity_error": 5.820766091346741e-11,
  "max_future_pathwise_additivity_error": 0.0,
  "max_absolute_national_internal_net": 3.456079866737127e-11,
  "future_rows_with_withheld_intervals_due_to_negative_population_paths": 137,
  "comparisons": 315,
  "selected_strategy_mae_wins": 76,
  "population_anchor": "Observed Jan1 2026; annual flows from2026 are forecasts, not observations",
  "intervals": "Nominal joint Gaussian innovations with training-only 50%-shrunk contemporaneous correlations; no parameter/source-regime uncertainty guarantee",
  "historical_balance_residuals": "Preserved as diagnostics, never silently assigned to migration"
}