LTX and WAN needed no module: both publish everything the derivation reads, and
it produces exactly what EmptyLTXVLatentVideo and Wan22ImageToVideoLatent
compute, by a different route. Pinned, along with a sweep over all 101 configs
ComfyUI ships -- rank, channel count and no empty axis -- so a family that
arrives after this was written is covered or fails here rather than at the first
sampling step.
H3 remains the only model needing a module of its own, because its latent is not
a single tensor.