apple build and play build run build.prebuild (or apple.prebuild / play.prebuild) first, once per flow run;
--no-prebuild skips it, --dry only prints it. A Capacitor project's copied public/index.html must then be newer
than the last source commit and <webDir>/index.html, else the build stops (--allow-stale-web overrides). check
warns when stale without a prebuild; the build output and dry plan show the web bundle's sha256 and mtime.
The Capacitor project is also found in a monorepo (apps/native etc.); several ask for play.build.dir /
apple.build.*. Pitfall 23.
