recipe: no horizontal flip and full-resolution masks by default (winner of the 2026-09-28/29 comparison)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tools/train_run.py

@@ -31,8 +31,11 @@ sys.path.insert(0, str(ROOT))
 
 from tools import ledger  # noqa: E402
 
-AUGMENT = dict(scale=0.7, translate=0.15, mosaic=0.5, close_mosaic=10, fliplr=0.5, flipud=0.3,
-               shear=5.0, perspective=0.0)
+# Recipe since 2026-09-29: no horizontal flip (the camera never shows the pin on the left) and
+# full-resolution masks (mask_ratio 1), the combination that kept run A's detection with the
+# tightest masks; before that fliplr=0.5 and mask_ratio=4, as in the legacy train_yolo_seg.py.
+AUGMENT = dict(scale=0.7, translate=0.15, mosaic=0.5, close_mosaic=10, fliplr=0.0, flipud=0.3,
+               shear=5.0, perspective=0.0, mask_ratio=1)
 GATE_TOL = 0.005
 CLASS_TOL = 0.02
 GUARDED_CLASSES = ("loop_all", "pin")