nx_dequant_bench_test.nx

nx_dequant_bench_test.nx -- the throughput-measurement smoke. Builds a synthetic Q4_K buffer of NX_DB_N_BLOCKS super-blocks (NX_DB_N_BLOCKS * 256 values per run, NX_DB_N_BLOCKS * 144 bytes input), runs nx_gguf_dequant_q4_k NX_DB_K_RUNS times, measures wall-clock time via sys_clock_gettime_mono, computes ns/value and MB/s, writes to /tmp/nx_dequant_bench.tsv for the smoke wrapper to cat back to the operator. Pass condition: smoke exits 0 if dequant completes without OOM, timing values are positive, no output value stuck at the INF_SAT clamp (no catastrophic overflow). The MEASURED NUMBERS are reported via the side-channel TSV; the smoke does NOT assert a throughput threshold (that would be aspirational without a known reference for this hardware).