nx_gate_lib.nx

nx_gate_lib.nx -- THE SHARED BASE FOR GATE ORGANS (gl_*), authored 2026-07-25 to eat debt seq938. WHY THIS EXISTS: nx_feed_gate, nx_p384_ecdh_gate and nx_tls12_prf_gate were each written with a PRIVATE copy of the same six helpers (slen/puts/putn/bcat/bcatn/contains) under three different prefixes -- fdg_ / pkg_ / tpg_. That is the exact drift the flip family already paid to fix with nx_flip_lib.nx's fx_* base: a fix to one copy fixes ONE gate, and the family silently diverges. Same mistake, same cure. It also fixes the contract every gate member must honour, so a new gate inherits it instead of re-deriving it: (1) print FAILURES ONLY -- a roster of PASS lines buries the failure the gate exists to surface, and the plan-runner snippet cap (200B) will truncate it away entirely. (2) emit a `verdict=GREEN|RED pass=N/M` anchor LAST so the D001 judge and the beat can read it. (3) counts[0]=total counts[1]=pass, so a case can never be "counted" without being adjudicated. (4) a case asserts BOTH an exit code AND a required output substring -- an exit code alone lets a silently-wrong organ pass, and a substring alone lets a crashed one pass. license_tier: ORIGINAL No hw writes (Rule 26).