sketch_cuckoo_test.nx

sketch_cuckoo_test.nx -- Cuckoo Filter end-to-end verification. Exit code mapping (matches smoke gate): 0 all pass 5 alloc returned NULL or rejected power-of-2 10/11 empty filter false positives 20 insert returned 0 (failed) under-capacity 21/22 contains returns wrong value after insert 30 delete returned 0 (failed) for present item 31 contains still returns 1 after delete 32 total counter wrong after delete 40 rejected non-power-of-2 50 multiple inserts collide / total wrong 60 envelope_kind wrong 61 conf_ppb wrong (should be 1e9 - 31e6) 62 maturity wrong 63 adv_safety wrong 70 deterministic reproducibility broken