nx_bench_collatz.nx

nx_bench_collatz.nx -- NishiLang twin of bench/xlang/collatz.c (branch-heavy). Max Collatz stopping-time over [1,N) + XOR step checksum. Prints checksum then elapsed_us. Checksum MUST equal the gcc AND clang builds (3rd-party oracles). license_tier: ORIGINAL No hw writes (Rule 26). (nx_syscalls_x86_64.nx import REMOVED 2026-07-31, debt 1785528831. This file already gets the canonical syscall layer transitively via nx_clock.nx -> syscalls.nx. Importing nx_syscalls_x86_64.nx as well put TWO syscall layers in one translation unit: every wrapper defined twice, one against RAW x86 numbers and one against the @ifndef TARGET_X86_64 RV64 numbers the backend translates at emit (SYS_POLL 7 vs 73). nx_cc accepted the redefinition silently and let definition ORDER pick the numbering.)