pub fn mlkem_sample_matrix_w16_from_int(seed: &[i64]) -> LogosSeq<Word16>Expand description
Native entry for the full 3×3 matrix  (9 × 256 Word16, entry Â[r][c] at slot (r·3+c)·256),
4-way AVX2 SHAKE128 batched — the shipped-Logos mlkemSampleMatrixW16(rho).