Add RF-DETR keypoint preview models and config

Track *.pte with Git LFS and add CoreML, XNNPACK, and MLX preview models.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitattributes

@@ -33,3 +33,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+*.pte filter=lfs diff=lfs merge=lfs -text

config.json

@@ -0,0 +1,3 @@
+{
+  "modelName": "rfdetr-keypoint"
+}

preview/coreml/rfdetr-keypoint-preview-coreml-iOS16-all-fp32.pte

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0455df2be527a464bba13876ab5cd1a2becbfb0e7a2d0dcc826c5e095bd6bffe
+size 147743446

preview/coreml/rfdetr_keypoint_preview_coreml_fp32.pte

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:250396199d4a8c8225d871e703c187db1dccac285fd2bab6e32b10a788356747
+size 147593973

preview/mlx/rfdetr_keypoint_preview_mlx_fp32.pte

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b220b83f4929a2d910ba400eb804879bd9ab758d60a2e3bf1ccae815c7332df5
+size 145349636

preview/xnnpack/rfdetr_keypoint_preview_xnnpack_fp32.pte

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8370196b0677734ce19e415d45c27f698b5ca14b6a6b399304e7945f3999fc57
+size 145598480