Drop the new ignore_multigpu positional argument from prepare_state and
from the ON_PREPARE_STATE callbacks; pass the flag via model_options
instead. This restores the original 3-arg callback signature so existing
custom-node ON_PREPARE_STATE handlers keep working unchanged, while
still letting prepare_state's recursive call into multigpu_clones
short-circuit.
Amp-Thread-ID: https://ampcode.com/threads/T-019e4a00-fe3d-76bd-a2f2-a8c8c4040082
Co-authored-by: Amp <amp@ampcode.com>
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