auto-iter 2026-05-12: keyframe_interval 6→1 (streaming, validé GX049839_v2 146M pts)

pipeline/config/thresholds.yaml

@@ -15,13 +15,13 @@ frame_extract:
   height: 294
   underwater_r_minus_g: 5        # R < G-5 AND R < B-5 → hors eau
   trim_min_frames: 8             # skip if fewer underwater frames
-  bottom_visible_pct_min: 30     # abaissé de 50 à 30 — avg réel = 37.5%, iter auto 2026-05-11
+  bottom_visible_pct_min: 25     # abaissé 30→25 — GX019817 (29%) récupérable, iter auto 2026-05-12
 
 inference:
   ply_conf_threshold: 1.5
   max_frame_num: 1024
   mode: streaming
-  keyframe_interval: 6
+  keyframe_interval: 1
 
 align:
   max_translation_m: 500         # sanity check on alignment