nx_diff_cmp.nx

nx_diff_cmp.nx -- R1-T1-002: the DUAL-LANE DIFFERENTIAL HARNESS organ. Runs the first <batch> corpus programs (knowledge/registry/diff_cmp.conf, bounded-N-per-beat per the T1 card) through BOTH toolchains via nx_dc_core and files findings: DIFFCMP rows per program, DIFFBUG + _dgbug<idx>.nx repro per divergence. FINDINGS ARE SUCCESS: exit 0 with disagree>0 is the instrument WORKING (the rows become pm/T2 fuel); exit nonzero ONLY on infra failure. FIRST LIVE PROBE (2026-06-11, pre-organ): _dgp0 diverged rcA=1 rcB=0 -- the corpus caught a real cross-lane divergence on program ZERO. argv[1]=conf override argv[2]=prefix override (default _dgp) Evidence: DIFFCMP-SUM row -> stdout + knowledge/status/diff_cmp.log. license_tier: ORIGINAL