gen_hll_bias_nx.nx

gen_hll_bias_nx.nx -- generate HLL bias table by running OUR HLL. SOVEREIGN-SUBSTRATE DISCIPLINE: prior generator used Python's getrandbits(64) and Python's idealized HLL math. That calibrated the bias table to PYTHON, not to our actual murmur3-based HLL. This generator runs OUR HLL on synthetic streams, collecting the raw alpha*m^2/sum_q32 directly from our register array. Output: writes hll_bias_table.nx-compatible const block to stdout. Caller redirects to runtime/hll_bias_table.nx. Caller args (compile-time consts here -- substrate has no argv yet): lg_k_min, lg_k_max -- range of lg_k to generate tables for n_samples -- sample points per lg_k across (threshold, 5m] n_seeds -- HLL trials per sample point