nx_recall_fuse_gate.nx

nx_recall_fuse_gate.nx -- KAT + HONEST BENCH for nx_recall_fuse. exit 0 = all pass; N = assertion N failed. Sovereign lane (nx_cc->nxasm). The bench is the point: it MEASURES the nDCG lift of hybrid fusion over BM25-alone on the nx_ir_eval ruler, on a fixture that reproduces the live failure -- a relevant doc buried by lexical BM25 but caught by the dense/semantic signal. A green gate here = the SOTA rung moved a real number, not a claim.