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

pipeline/config/thresholds.yaml

@@ -21,7 +21,7 @@ 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