Update app.py

app.py

@@ -14,6 +14,9 @@ from models import ChatRequest
 from ui_html import HOME_HTML
 from utils import clamp01, get_user_text
 
+from retrieval_engine import RetrievalEngine
+
+retriever = RetrievalEngine()
 
 app = FastAPI(title="GMAT Solver v3", version="3.1.0")
 
@@ -130,6 +133,10 @@ async def chat(request: Request) -> JSONResponse:
     hidden_context, actual_user_message = split_unity_message(full_text)
     game_fields = extract_game_context_fields(hidden_context)
 
+    # NEW
+    context = retriever.search(actual_user_message)
+    context_text = "\n".join(context)
+
     tone = clamp01(req_data.get("tone", req.tone), 0.5)
     verbosity = clamp01(req_data.get("verbosity", req.verbosity), 0.5)
     transparency = clamp01(req_data.get("transparency", req.transparency), 0.5)
@@ -151,6 +158,7 @@ async def chat(request: Request) -> JSONResponse:
         options_text=game_fields["options"],
         question_category=game_fields["category"],
         question_difficulty=game_fields["difficulty"],
+        retrieval_context=context_text,
     )
 
     return JSONResponse(