Add AR int4 prefill external data

.gitattributes

@@ -36,3 +36,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 higgs_audio_v3_vocoder_decode.onnx.data filter=lfs diff=lfs merge=lfs -text
 higgs_audio_v3_vocoder_decode_matmul4.onnx.data filter=lfs diff=lfs merge=lfs -text
 tokenizer.json filter=lfs diff=lfs merge=lfs -text
+ar/higgs_audio_v3_ar_prefill_matmul4.onnx.data filter=lfs diff=lfs merge=lfs -text

ar/higgs_audio_v3_ar_prefill_matmul4.onnx.data

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ae949d95d5d9b9afe6ed6da38415e6974c470bd14676897177021ce2ded3ff3d
+size 2116382720