revert: remove post-processing, use raw model output — works best for majority of images

fix: iterative necrotic recovery (3x30px) — bridges gap to necrotic toes

feat: necrotic tissue recovery — dark regions adjacent to foot reclassified as ulcer

fix: preserve dark necrotic tissue connected to foot, only remove isolated dark blobs

feat: postprocess segmentation — largest component + dark pixel exclusion + morphological cleanup

Add pipeline code, PWAT models, and Gradio app