fix: include modifications missed by 528447c
Previous commit only picked up the new files (branding.nix, hardware-db.sh).
This adds the matching wires:
- core/system/default.nix: import branding.nix
- flake.nix: expose overlays.default = nomarchyOverlay for downstream flakes
- installer/disko-golden.nix: 1 GiB /boot, @snapshots subvolume, LUKS key
via /dev/shm
- installer/install.sh: hardware auto-detect, hostname prompt, pinned
nomarchy commit, shared pkgs in generated flake, flake.lock generation,
post-install home-manager switch via nixos-enter
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>