Fix app crash on startup

agents/demystifier_agent.py

@@ -11,6 +11,9 @@ from langchain_community.vectorstores import FAISS
 from langchain_core.prompts import PromptTemplate
 from langchain_core.runnables import RunnablePassthrough
 from langchain_core.output_parsers import StrOutputParser
+from core_utils.core_model_loaders import load_embedding_model
+
+embedding_model = load_embedding_model()
 
 # ... (rest of imports)