Refine training script output and validation

1. Loss printed at every epoch with \r (no scrolling)
2. Validation only on final epoch (not all checkpoints)
3. Process all input images (not just img_000.png)

Training output now shows live progress with single line update.

1 files changed, 0 insertions, 0 deletions

diff --git a/validation_results/epoch_65_output.png b/validation_results/epoch_65_output.png
new file mode 100644
index 0000000..ea63a31
--- /dev/null
+++ b/validation_results/epoch_65_output.png