Tighten DeMemWM acceptance tests

Add DeMemWM trainability controls

Add DeMemWM memory noise routing

Add DeMemWM geometry-aware memory attention

Implement DeMemWM online validation memory

Clean up DeMemWM naming and memory path

Reject unimplemented WorldMem memory backend

Harden DeMemWM checkpoint loading

Add DeMemWM model acceptance checks

Return target-only DeMemWM DiT outputs

Build DeMemWM frame memory geometry cache

Add DeMemWM frame memory reference attention

Add DeMemWM segment-aware temporal mask

Thread DeMemWM frame memory pose metadata

Slice DeMemWM diffusion updates to target frames

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