Fix: DRModel attribute names match notebook checkpoint (backbone/head_cls/head_coral/dict return) — weights now load correctly; GradCAM aug_smooth=False; lesion ROI max area cap

Fix: notebook-exact GradCAM++ multi-layer fusion + CAM-derived lesion ROIs

Update model_classes.py

Update model_classes.py

Update model_classes.py

Rename Model classes.py to model_classes.py