nx_bench_matmul.nx

nx_bench_matmul.nx -- NishiLang twin of bench/xlang/matmul.c. Memory-bound integer matmul checksum (64-bit wrapping). Prints checksum then elapsed_us. Cm[r % (N*N)] === Cm[r] since r<REP<N*N, written directly. Checksum bit-exact vs gcc AND clang (3rd-party oracles). license_tier: ORIGINAL No hw writes. (nx_syscalls_x86_64.nx import REMOVED 2026-07-31, debt 1785528831: this file already gets the canonical syscall layer via nx_clock.nx -> syscalls.nx, so importing the raw-x86 module too put TWO syscall layers in one TU -- every wrapper twice, numbering picked by definition ORDER, silently.)