Add an optional preparation node that calls the verified native latent helper
and returns both the prepared context and its exact shared target LATENT.
Consume raw downscale metadata, preserve mask and foreign packet values, and
bind provenance to the original packet, model, format and helper state.
Keep existing consumer identity checks and the original seven node interfaces.
Reject spatial resizing after an owned grounded wrapper has primed its VAE
cache. Disabled preparation returns the original context and target unchanged.
All 201 tests and required compile checks pass. Exact native caller/helper
fixtures pass on Python 3.11 and 3.13; serving-host acceptance remains pending.
Kevin Gilper
32d7bfa4b2