Add model checkpoint: prompt_guard_best.pt (v1)

Upload trained prompt safety classifier checkpoint.
- Base: microsoft/deberta-v3-base
- Best threshold: 0.95
- Intended use: prompt safety detection

prompt_guard_best.pt

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cc8f87bc4e8f60d0b130ebd2058a50d84009d49edd9569a96b90287cefd53b30
+size 737763434