Loader nodes now get required-input defaults plus 'prefer' picks instead of
bare kwargs, so LoadAesteticModel no longer fails on its missing model_name.
Adds scale/max_batch/vram_mb registry keys, adapter_status() 'problem', and
signature-copy fake nodes for strimmlarn@42bed3f and ZaneA@5e9936d.
ImageReward ships disabled (not live-tested).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>