Bind the exact older sampler and model-base pair after reviewing its no-op
writable-model scope difference for Krea. Reject mixed revisions, writable
instance overrides and additional multigpu models.
Admit the installed Krea2T revision with unchanged math and extra registrations.
Verify observed loaded call-path code and enhancer constants against admitted
source instead of relying on file hashes alone. Keep native node ports, task
recipes, inference identity/revision limits and existing defaults unchanged.
Validation: 170 host-free tests, required compile, saved-source native control,
enhancer invocation and loaded-code counterexamples. Real runtime/model and
application end-to-end acceptance remain separate.