Update app.py

Initial changes v1.0

app.py

@@ -4,6 +4,9 @@ import requests
 import inspect
 import pandas as pd
 
+from agentic_agent import build_graph
+from langchain_core.messages import HumanMessage
+
 # (Keep Constants as is)
 # --- Constants ---
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"