We tried compiling Port42's core on Linux and Windows. The same 30 of 57 files built on both

We carved out the part of Port42 we call the kernel, 57 files, and had CI build it on both platforms, dropping any file that failed until the rest compiled.

30 files survived, 3,855 lines, and they were the same 30 on both. Windows didn't lose a single file that Linux kept.

The other 27 need macOS, directly or through something they depend on. Untangling that is the actual Windows project.

carved 57 files, 10923 lines
SURVIVES ON LINUX:   30 files, 3855 lines
SURVIVES ON WINDOWS: 30 files, 3855 lines