Update app.py

app.py

@@ -58,7 +58,7 @@ from level_classifier_tool_2 import (
 from task_temp import rag_temp, rag_cls_temp, cls_temp, gen_temp
 from all_tools import classify_and_score, QuestionRetrieverTool
 from phrases import BLOOMS_PHRASES, DOK_PHRASES
-
+from pathlib import Path
 # ------------------------ Prebuild embeddings once ------------------------
 _backend = HFEmbeddingBackend(model_name="google/embeddinggemma-300m")
 # Belt-and-suspenders: ensure eager attention even if class wasn't patched