Three new nodes (SelvaModelLoader, SelvaFeatureExtractor, SelvaSampler)
vendoring selva_core from jnwnlee/selva. Pure PyTorch, no subprocess,
zero new pip dependencies. TextSynchformer provides text-conditioned sync
features for improved audio-visual alignment.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>