qector-bp-osd

Belief propagation with ordered-statistics post-processing (BP-OSD) for QECTOR. Covers the box-plus kernel phi(x) = -ln(tanh(x/2)), the log-domain sum-product / min-sum / relay schedules, the OSD-0 / OSD-W solve (Theorem 11), the ambiguity-cluster partition (Theorem 12), and the worked examples from the v1.0.0 reference manual (chapters 8 and 9). Load for any qLDPC, hyperedge, or non-graphlike question, or for the…