Modern macOS binaries require LC_BUILD_VERSION to declare platform and minimum OS version. Without it, the kernel may reject the binary. - Add LC_BUILD_VERSION (platform=macOS, minos=11.0, sdk=14.0) to both MachOWriter (x64) and MachOWriterArm64 (arm64) - ncmds 9→10, sizeofcmds += 24 - Add codesign -dv / codesign --verify / spctl / otool -l diagnostics to macOS workflow smoke test to identify why binaries get Killed:9