nx_race_kernel.nx

nx_race_kernel.nx -- Nishi contestant in the ONGOING race vs C. A representative CPU-bound integer kernel (LCG mix + xorshift + masked reduction = the shape of hashing / PRNG / sensor signal work). Pure compute, NO I/O (fair: no syscall confound in the timed region). Self-times with rdtsc (best-of-3 to cut noise) and prints "<checksum> <cycles>" so the harness can compare 1:1 against the C build of the SAME algorithm. The checksum is a bounded reduction (always small + positive) so it is byte-identical across the two languages regardless of signed-print quirks. Fairness contract (RACING_TEAM_BENCHMARK_DOCTRINE): identical algorithm, same K, same shift semantics (arithmetic >>), same wrapping 64-bit multiply, same box.