nx_newton_struct.nx

nx_newton_struct.nx -- the Newton-Raphson reciprocal-divider STRUCTURE (the operator dependency chain of nx_alu_divider_newton.nx) as an NxGsim network, parameterized by width W, iteration count, correction stages, and the MULTIPLIER MODEL (deep limb-schoolbook vs shallow single-cell Wallace). Extracted from nx_latency_metric_test.nx so the latency race AND the hardware-adaptive divider picker (nx_div_pick.nx) build the SAME structure from ONE source (DRY). It is a LATENCY/topology skeleton -- the functional 1:1 Newton gate-net is nx_recip_synth.nx; the scalar arithmetic proof is nx_alu_divider_newton.nx. license_tier: ORIGINAL