feat(mortality): switch to dead-chicken-seg model with conf 0.3 / iou 0.5

configs/mortality_config.yaml

@@ -6,10 +6,10 @@ mortality:
   # Default single-coop input directory (or override via --coop K1 / --all-coops)
   input_dir: "../VIDEOS/cycle7/K1/mortality"
   output_dir: null   # null = save output_<File Name> in each coop's mortality directory
-  model_path: "models/chicken-detection-model-v26n-seg-300e-best-2026-04-18.pt"
+  model_path: "models/dead-chicken-seg.pt"
   device: "0"        # "0" for GPU acceleration, or "cpu"
-  conf: 0.7
-  iou: 0.8
+  conf: 0.3
+  iou: 0.5
   min_box_area_px: 1500
   dedupe_radius_px: 30.0
   two_pass: false     # Enable Union 2x Detect & Refine crop pipeline