Mpi Save Latent

Save a latent to disk, then optionally stop the branch there (block) or carry on (continue). Handles packed audio+video latents (MiniMax H3) that crash the core Save Latent node. The boolean output is not blocked, so it can still drive another branch. Turn `enabled` off on runs that must not save (e.g. a stage-2 continue): this is an output node, so ComfyUI runs it on EVERY submit and would otherwise drag the whole sampler feeding it along with it. `enabled` off skips that work entirely.