Document post-M3 state on main, GitHub vs AUR publishing separation,
AUR pkgrel=11 / source tag gap, M1 UI identity status, and CI test
workflow. packaging/aur/README.md clarifies local-only AUR sync.
Complete M1 identity work, fix runtime URL regressions, repair the test
suite, add CI, migrate packaging/AppImage branding to Bearhub, and
document the Qt6/PySide6 migration plan.