Moved math_sse.zig and all 17 hook declarations + CriticalSection spin
count optimization from transform44 into new ssemaths module. Off by
default (-Dssemaths=true to enable).
transform44 retains its profiling hooks and blit_hub optimization.
ssemaths is a clean standalone module with its own mutex, install/remove
lifecycle, and lateInit for post-UnitXP hook clobbering.
Added performance note to math_sse.zig documenting that hook-based
replacement adds ~5-8 cycles overhead that makes small functions slower,
and that in-place patching is the path to realize the full 2-4x gains
shown in inlined benchmarks.
MarcelineVQ
3c9a95d51e