ULDA Topological Decoder Engine - Fixed-Point Sexagesimal Architecture

A fixed-point sexagesimal architecture for radix-drift elimination in 3D spacetime topological quantum error correction simulations. Uses a pure integer register space (Base-60) with dual-register error accounting, eliminating IEEE 754 floating-point roundoff artifacts. Achieves machine-zero convergence (2.62 x 10^-14 at depth r=12).