Update requirements.txt

requirements.txt

@@ -1,10 +1,21 @@
 gradio
 requests
-faiss-cpu==1.8.0
-langchain-community==0.2.0
-langgraph==0.1.0
-langchain-core==0.2.0
+# --- Vector & retrieval
+faiss-cpu==1.8.0.post1
+sentence-transformers==2.7.0
+langchain-community==0.2.10
+langchain-core==0.2.23
 langchain-huggingface==0.0.3
-langchain-google-genai==1.0.0
-pillow
-cachetools
+
+# --- LangGraph agent framework
+langgraph==0.2.15
+
+# --- LLM providers
+langchain-google-genai==1.0.8
+langchain-groq==0.1.6
+langchain-huggingface==0.0.3          # (listed twice, safe)
+
+# --- Tools & utilities
+pillow==10.4.0
+cachetools==5.4.0
+python-dotenv==1.0.1