script/graph.py

# LangGraph definition: retrieval only. Generation moved to the Gradio +
# ZeroGPU UI Space (see PLAN.md's "Inference architecture" section) since
# ZeroGPU only runs inside a Gradio Space process, not a remote backend call.
from langgraph.graph import StateGraph, END
from script.state import GraphState
from script.retriever import retrieve

def build_graph():
    graph = StateGraph(GraphState)

    graph.add_node("retrieve", retrieve)

    graph.set_entry_point("retrieve")
    graph.add_edge("retrieve", END)

    return graph.compile()