docs: organize repo structure for segmentation and future classification

README.md

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+# GoldMDD Model Artifacts
+
+- `segmentation/checkpoints/`: semantic segmentation checkpoints
+- `classification/`: reserved for future classification models

classification/README.md

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+# Classification
+
+Reserved for future classification model checkpoints.

segmentation/README.md

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+# Segmentation
+
+This folder stores semantic segmentation model checkpoints.