Seed YOLO training font locally

backend/tests/test_sprint129_operator_yolo_training_dataset.py

@@ -64,6 +64,9 @@ def test_operator_yolo_train_smoke_script_contract() -> None:
     assert "from ultralytics import YOLO" in script
     assert "model.train" in script
     assert "plots=False" in script
+    assert "seed_ultralytics_font" in script
+    assert "DejaVuSans.ttf" in script
+    assert "Arial.ttf" in script
     assert "training_summary.json" in script
     assert "download" not in script.lower()
     assert "fixture_mode" not in script