Thread DeMemWM frame memory diffusion metadata

Add DeMemWM latent validation path

Add DeMemWM latent training step

Prepare DeMemWM pose and image metadata

Prepare DeMemWM latent action conditioning

Implement DeMemWM segment split preprocessing

Implement DeMemWM batch contract

Add DeMemWM step 1-4 dataset scaffold

Keep reproduction train and eval fixes

update evaluation and fix psnr

mideway

fix

to merge

fix

after multi-frame gen

update

first commit