During training, the model only saves `epoch_009.ckpt` and `last.ckpt`, but the `best.ckpt` file is not created/saved. <img width="169" height="187" alt="Image" src="https://github.com/user-attachments/assets/6d8fec3b-2da6-4b68-a9d3-a11a9d57c536" />