Remove hardcoded HF token for security

src/search_final.py

@@ -78,8 +78,8 @@ except Exception as e:
     raise
 
 # ---------------- Hugging Face Mistral API ----------------
-#HF_TOKEN = "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"
-#HF_MODEL = "mistralai/Mistral-7B-Instruct-v0.2:featherless-ai"
+# HF_TOKEN and HF_MODEL should be set via environment variables
+# HF_MODEL = "mistralai/Mistral-7B-Instruct-v0.2:featherless-ai"
 
 def get_mistral_answer(query: str, context: str) -> str:
     """