Add an opt-in horizontal low-edge transform for subu rd,zero,rt classifiers, with matching native and dirty-RAM interpreter behavior and guarded overlay variants.
Co-authored-by: Opok <novelasevilliousesp@gmail.com>
Avoid exposing std::span through config_loader.h, which is consumed by C++17 game runtimes. Add a dedicated C++17 header compile test alongside the guarded-patch suite.