Switch to XET storage for model.safetensors

- Updated .gitattributes to use XET storage instead of LFS
- model.safetensors now has actual weights (3.8MB, not LFS pointer)
- XET provides chunk-level deduplication and faster uploads

.gitattributes

@@ -22,7 +22,7 @@
 *.pt filter=lfs diff=lfs merge=lfs -text
 *.pth filter=lfs diff=lfs merge=lfs -text
 *.rar filter=lfs diff=lfs merge=lfs -text
-*.safetensors filter=lfs diff=lfs merge=lfs -text
+*.safetensors filter=xet diff=xet merge=xet -text
 saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.tar.* filter=lfs diff=lfs merge=lfs -text
 *.tar filter=lfs diff=lfs merge=lfs -text