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Multi-Facet Orthogonal SPLADE projector — runs the baked ONNX graph
(encoder + K facet heads + SPLADE pool → vecs [1,K,V]) and reads the top active vocab terms per
facet, emitting facet-prefixed infon tokens (actor/…, instrument/…, target/…,
constraint/…). Ported from src/ingest/splade/index.ts.