build_exe.py compiles every unit in data/compile.json with the pinned toolchain and links Ragexe.exe.
Not part of the decompilation and not in data/compile.json: imports/*.def (original DLL import tables),
jsoncons/ (v0.170.2 headers + JsonCppLoader glue), nProtect/GameGuard.cpp (no-op GameGuard stand-in).
