Arctic Linux - Alpha 3 SS

First release under the new version scheme: main.bigfix.smallfix plus a stability suffix (U/VS/S/SS, SS = super stable, the top of the scale). This release stabilizes everything since Alpha 2 and closes the release cycle before multilib and Rust work starts on Alpha 4. Development of Alpha 4 might take a couple days.

sha256: a95be074c668ebfd1749b9c191d7a246e63890676c21fb8ad3a6b8457c7af462

Verified this cycle, on a real arctic-install target booted through its own bootloader (not just the sandboxed build host):

• boot to login prompt: ~5.6s, login to shell: ~2s
• clang could not run at all on a freshly installed system - libc++ was never on the dynamic linker's search path. This was masked all cycle by the sandboxed build host's own /etc/ld.so.conf being visible through the bind mount; a real chroot with no host underneath caught it. Every source build (alpm add -s) was broken before this fix.
• every fresh btrfs install kernel-panicked (Attempted to kill init!) - missing rootflags=subvol=@ on the kernel cmdline
• nmtui shipped with a hardcoded build-host path instead of a real libnewt.so soname
• `wifi-connect" and NetworkManager fighting over the same radio, misreported as no networks in range
• coldplug's progress dots never appeared on the default boot entry (the one everyone actually boots from) because they were gated behind a flag that entry always sets
• two real package-manager conflicts: ninja/btop both vendoring googletest libraries that collided with each other, and every desktop profile colliding with the plain foot terminal package's own default config