Add llama-2-7b-chat-hf tokenizer.json (canonical, array-safe merges) for pipeline oracle

.gitattributes

@@ -64,3 +64,4 @@ fixtures/**/*.txt filter=lfs diff=lfs merge=lfs -text
 bert-base-uncased.json filter=lfs diff=lfs merge=lfs -text
 deepseek-v4.json filter=lfs diff=lfs merge=lfs -text
 t5-base.json filter=lfs diff=lfs merge=lfs -text
+fixtures/models/** filter=lfs diff=lfs merge=lfs -text

fixtures/models/llama-2-7b-chat-hf.json

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bcd04f0eadf90287bd26e1a183ac487d8a141b09b06aecb7725bbdd343640f2e
+size 1842767