Update kb_embed.py

kb_embed.py

@@ -20,7 +20,7 @@ collection = client.get_or_create_collection(name="knowledge_base")
 
 # --- Embedding model ---
 # If you keep the model folder locally in the repo:
-model = SentenceTransformer(str(MODEL_DIR))
+model = SentenceTransformer("sentence-transformers/all-MiniLM-L6-v2", cache_folder=str(MODEL_DIR))
 # Or, if you prefer auto-download & cache (no local folder required):
 # model = SentenceTransformer("all-MiniLM-L6-v2")