no relative ./data path => /data

app.py

@@ -13,8 +13,8 @@ from filelock import FileLock
 
 
 PAIRS_CSV = Path("pairs.csv")   # columns: run_id, model, source_type, instruction, response, text
-OUT_FILE  = Path("./data/annotations.csv")
-LOCK_FILE = Path("./data/annotations.csv.lock")
+OUT_FILE  = Path("/data/annotations.csv")
+LOCK_FILE = Path("/data/annotations.csv.lock")
 
 # --- Config ---
 K = 1