- Release builds: scripts/build-macos.sh (app + DMG, engine patches applied
  idempotently) and scripts/cross-build-windows.sh (llvm-mingw cross-compile,
  Qt deploy, NSIS installer and portable zip).
- Engine patches: step over arm64 debug breaks, ignore SIGPIPE, Ctrl+Cmd+F
  fullscreen on macOS, optional non-Retina rendering.
- Launcher updates come from a configurable AL-Arcade release feed
  (ALARCADE_UPDATE_FEED_URL) and show in the sidebar on both platforms.
- Restyled the remaining upstream screens (sign-in, profile editor, game log,
  mods, troubleshooting, versions, storage) onto the shared theme.
- README, NOTICE and the GPL-3.0 LICENSE at the repository root.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>