Upload verified XL rotation checkpoint at step 12000

Add XL alternating 0/90 rotation training configs

Add Conv final 800-epoch checkpoint

Add original Rotation-head CFG1 FID history at 250k, 500k, 750k and 1M

Add Rotation-head optimizer-step 1250000 resume checkpoint

Backup final base/rotation-layer and latest conv-layer experiments

Upload folder using huggingface_hub

initial commit