A provider that raised was treated exactly like one that said "not my
model", so the node fell through and derived a shape for the very model the
provider existed to handle -- and reported success. For H3 at length=124
that is 31 latent frames against a real grid of 37: a 16% shorter video,
with nothing downstream saying anything.
The protocol is now stated: return None for "not mine", and let anything
else raise. Recognition happens before anything that can fail, so an
exception means the model was already claimed, and the node refuses rather
than substituting a generic shape.
execute() had no test at all -- the dispatch between claimed and derived is
the point of the node, and both earlier tests called around it. It now runs
through the real registry, and the refusal test fails against the old
fall-through.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
