tokenizer_config: inline the gemma-4 chat template (ships as separate chat_template.jinja upstream, which swift-transformers does not read; without it prompts raw-encode and generation degenerates to turn markers)

gpu-pipelined-b2/gemma4_e2b_qat_decode_int4lin_tbl_aotc_h18p/tokenizer/tokenizer_config.json

@@ -92,5 +92,6 @@
   "str_token": "<|tool_response>",
   "think_token": "<|think|>",
   "tokenizer_class": "GemmaTokenizer",
-  "unk_token": "<unk>"
-}
+  "unk_token": "<unk>",
+  "chat_template": "{{ bos_token }}{% for message in messages %}<|turn>{% if message['role'] == 'assistant' %}model{% else %}{{ message['role'] }}{% endif %}\n{{ message['content'] }}<turn|>\n{% endfor %}{% if add_generation_prompt %}<|turn>model\n{% endif %}"
+}