nx_asm_canary.nx

nx_asm_canary.nx -- the ASSEMBLER CANARY law as an executable organ (2026-06-10): no nxasm build is trusted until it assembles the canary (_mb_gate.s) and the result RUNS and exits 42. This module: 1. runner-builds nxasm_x86_main (retry-guarded -> /tmp/nxasm_x86_main.sov.elf) 2. new build assembles _mb_gate.s -> /tmp/canary.elf 3. runs canary.elf -> exit MUST be 42 (signal-aware) 4. emits CANARY PASS/REJECT line to /tmp/nishi_ladder.log ; exit 0=blessed, 1=rejected Closes the failure class where a parse-broken 1-shot build (reg->r15, imm->0xAB) masqueraded as a source bug and burned a session (and likely created the May30 "landmine" verdict). license_tier: ORIGINAL