Add ONNX embedding models for CaseTrack

- legal-bert-base-uncased: Dense embeddings (E1)
- splade-cocondenser-selfdistil: Sparse embeddings (E6)

These are pre-converted ONNX exports for use with the CaseTrack MCP server.

.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
+*.onnx.data filter=lfs diff=lfs merge=lfs -text

legal-bert-base-uncased/model.onnx

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4823d80989a42c6ca1f7fd38ca473bf09d3535047f814b3c322c41b7c96dea05
+size 1242753

legal-bert-base-uncased/model.onnx.data

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e5b2380133cf24a99834686f924f666d5e65660719df6987b9a78f7079165726
+size 437958656

splade-cocondenser-selfdistil/model.onnx

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:070b19b0f82d4043ebb07f2b0a49536013626f8f6abc0bc38c67b2eb283e9620
+size 1443113

splade-cocondenser-selfdistil/model.onnx.data

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:20903bce83ab61736156a5c7ef0d071cdc5e1cccb1a9c90e0ec6511e89e04678
+size 438089728