[data] train 150 held 80
[data] gate pts tr 40334(5762+) te 22589(3227+) idx te 3227
[A] gate AUC=0.9537 best-F1={'f1': 0.725, 'precision': 0.674, 'recall': 0.785, 'thresh': 0.696} R@P0.9=0.359 shipped={'thresh': 4.04, 'precision': 0.866, 'recall': 0.469}
[B] gate AUC  logistic=0.9500 mlp256=0.9607 mlp512=0.9604
[C] backward-scan {"tau=-32.12": {"reach_rate": 0.755, "avg_blocks_scanned": 7.18}, "tau=-31.70": {"reach_rate": 0.616, "avg_blocks_scanned": 7.22}, "tau=-31.32": {"reach_rate": 0.445, "avg_blocks_scanned": 7.22}, "gold_recency_rank": {"mean": 6.49, "median": 7, "frac_in_recent_3": 0.001, "frac_in_recent_8": 0.747}}

=== EXPLORE SUMMARY ===
{
 "data": {
  "gate_pts_held": 22589,
  "pos_held": 3227,
  "idx_held": 3227
 },
 "A_gate_operating_point": {
  "auc": 0.9537,
  "best_f1": {
   "f1": 0.725,
   "precision": 0.674,
   "recall": 0.785,
   "thresh": 0.696
  },
  "recall_at_p0.9": 0.359,
  "precision_at_r0.9": 0.526,
  "shipped_threshold": {
   "thresh": 4.04,
   "precision": 0.866,
   "recall": 0.469
  }
 },
 "B_gate_model_search": {
  "logistic_auc": 0.95,
  "mlp256_auc": 0.9607,
  "mlp512_auc": 0.9604
 },
 "C_backward_scan": {
  "tau=-32.12": {
   "reach_rate": 0.755,
   "avg_blocks_scanned": 7.18
  },
  "tau=-31.70": {
   "reach_rate": 0.616,
   "avg_blocks_scanned": 7.22
  },
  "tau=-31.32": {
   "reach_rate": 0.445,
   "avg_blocks_scanned": 7.22
  },
  "gold_recency_rank": {
   "mean": 6.49,
   "median": 7,
   "frac_in_recent_3": 0.001,
   "frac_in_recent_8": 0.747
  }
 },
 "D_bge_small": {
  "note": "skipped (block texts not in IX rows); base bge_head is canonical"
 },
 "final": true,
 "elapsed_s": 340.4
}
DONE t=340s