docs/checkpoints_layout.md

Checkpoint layout

Training writes to a single directory per architecture, under checkpoints/:

Arch	Default folder	Env override
cnn	checkpoints/cnn_baseline/	ARTY_CHECKPOINT_CNN_DIR
cnnrnn	checkpoints/cnnrnn/	ARTY_CHECKPOINT_CNNRNN_DIR

Each folder contains:

• best.pt — best val loss (for eval / upload)
• last.pt — latest epoch (for --resume)
• train_log.csv — per-epoch metrics
• results_summary.csv — summary written at end of training

ARTY_CHECKPOINT_* values are paths relative to checkpoints/ (e.g. cnn/mar17 for nested runs).