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One fold per monsoon season (train <= 30 Apr, test Jun-Nov, 2021-2025) replaces the single fixed holdout that contained only ~4 warning events. Metrics are what matters operationally: sustained first-alert lead vs each observed 3.70m crossing (two consecutive alerting samples required; lookback floored at the previous event's end so multi-peak floods can't launder lead credit), peak error from the prediction actually issued 24h before the peak (3h match tolerance, null on outages), false-alarm episodes (12h gap tolerance), MAE / flood-regime MAE, and a Brier score on warning exceedance — included because sigma cancels algebraically in any p>=0.5 alert metric, so lead times compare predictors while Brier compares uncertainty models. Variants: baseline_abs (current), rise (target = future max - current level), rise_weighted (flood-regime sample weights 1x->5x), and rise_quantile (q50/q90 heads, spread-implied sigma). Harness verified by a 3-agent adversarial review (features bit-identical across fold cutoffs; three metric flaws found and fixed before first use). Also: features.build_labels/build_matrix gain stats_end so the rescue quantile is computed from pre-cutoff data only, closing the label- construction leak flagged in the earlier ML review.