Captures the why behind the build: the read-only /app core tension, the
packaging architecture (no flatpak-builder/bwrap, Sdk-not-Platform, OSTree on
pages), the full read-only-/app saga (X11, Python sdist hook, wrapper venv
bootstrap, SNAP/SNAP_BUILD engine path, the unrelocatable user folder, the
icon), the CI flow, and a maintenance/debugging guide for future O3DE releases.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
