nx_div_pick.nx

nx_div_pick.nx -- the HARDWARE-ADAPTIVE divider picker: the Nishi Seed's "grow to meet the hardware's capabilities optimally" mechanism, concretely. For a target described by (width W, multiplier model use_wide_mul), it BUILDS each candidate divider gate-net (radix-2, radix-4, Newton/Goldschmidt), MEASURES each one's HONEST critical-path latency with the real gate-delay cost model (nx_lat_honest: AND=1, ADD=log2 W, MUL=2*log2 W), and RETURNS the kind with the minimum -- the optimal divider FOR THAT HARDWARE. This is pure search + cost model (no LLM): the Fitness leg ranking Generator variants, the same loop a deployed Seed runs to auto-tune its stack to the silicon it lands on (a chip with a fast wide multiplier picks Goldschmidt; a minimal one picks a radix divider). Reuses the proven dividers + the proven honest latency metric. license_tier: ORIGINAL