nx_atlas_gapscan_gate.nx

nx_atlas_gapscan_gate.nx -- gate for graph-native atlas recombination (authored ON nx_gate_verdict per the migrate-on-touch law). Two graphs, because fixture gates prove CORRECTNESS and never SCALE ([[feedback-scale-law-no-toys-declare-envelopes]] -- the ark-v1 lesson institutionalized): FIXTURE graph (16 nodes, hand-built so every expectation is unambiguous): T5 neg-control: a pair with the IDENTICAL score to the positive one but WITH an import edge is NOT proposed -- the only difference between T5 and T6 is the edge, so this isolates novelty exactly T6 positive: the unconnected cross-wing maturity-gap pair IS proposed T7 island (ca=0,ce=0) never proposed T8 _gate scaffolding never proposed PRODUCTION-SHAPE graph (12000 nodes / ~21000 edges, ~9000 candidates -> the AR_MAXCAND 8192 cap is deliberately EXCEEDED so the truncation path is exercised, not assumed): T1 completes at production shape T2 the cap is HIT and DECLARED (no silent truncation) T3 topk respected T4 scores non-increasing (true top-K, not first-past-the-post) T9 absent store -> fail-closed nonzero exit license_tier: ORIGINAL No hw writes (Rule 26). expect_exit: 0