docs: overhaul to match current repo reality (DE/DM selectors, SDDM pixie theme, overlays, offline installer, CI)

- index/installer/launcher: release facts, SDDM theme (pixie on master), init/DE selectors, NoExtract for Install Artix entry
- packages: branding pkg ships offline+online settings (no packagechooser.conf fallback), drop antergos-sddm-theme, correct repo index names
- overlays/overlay-root/overlay-live: root-overlay is live-session only, real file trees, symlinked settings.conf, commit reference
- desktop-environments/wallpapers: remove No Desktop option, video wallpaper via layan-theme + Smart Video Wallpaper Reborn
- ci/development/building: three workflows incl. ai-moderator, IA upload disabled (if:false)
- byode: new page documenting the SteamOS-inspired offline installer
- AGENTS.md/openrc: OpenRC was an installer-only dinit conflict; manual rc-update add works

docs/byode.md

@@ -0,0 +1,48 @@
+---
+title: Offline Installer (BYODE)
+layout: default
+nav_order: 14
+---
+
+# Offline Installer (BYODE)
+
+The offline installer (`/usr/local/bin/antergos-offline-install`) is a bare-minimum installer for situations where the Calamares online installer can't work — no internet, or you want a minimal base to build on. It is **experimental** and best-effort; the Calamares online installer remains the primary path.
+
+The script is adapted from Valve's SteamOS `repair_device.sh` (the Zenity prompt and pretty-output helpers are lifted straight from there).
+
+## What it does
+
+1. Verifies it's running as root in a live Antergos NeXT session (checks for `/run/artix/bootmnt/LiveOS/rootfs.img`)
+2. Warns that it installs **no desktop environment** — just the base system
+3. Lets you pick a target disk via `lsblk` + Zenity, then partitions it:
+   - GPT table
+   - 512 MiB EFI partition
+   - 300 MiB swap
+   - Root partition filling the rest
+4. Formats: `vfat` (ESP), `swap`, `btrfs` root
+5. Creates btrfs subvolumes: `@`, `@home`, `@cache`, `@log`, `@snapshots`
+6. Extracts the live rootfs (squashfs) to the target
+7. Generates an fstab with `subvol=` mounts and `compress=zstd`
+8. Chroots in: runs `mkinitcpio -P`, installs GRUB as `Antergos`, sets hostname
+9. Prompts for a root password and a daily user (added to `wheel` + sudoers)
+10. Enables services via `artix-service`: NetworkManager, dbus, acpid, bluetoothd, cronie, cupsd, dhcpcd, power-profiles-daemon, syslog-ng, userspawn
+11. Configures **snapper** for automatic snapshots (6 hourly + 7 daily + 4 weekly, via cron jobs)
+12. Unmounts, syncs, and offers to reboot
+
+## After first boot
+
+Since no desktop environment was installed, connect to the internet and run:
+
+```bash
+sudo pacman -Sy plasma-meta
+```
+
+or install any other DE you want.
+
+## Caveats
+
+- **Destroys all data** on the selected disk — confirmed via Zenity twice.
+- No Calamares integration (no partitioner UI, no locale/keyboard/user pages).
+- Package lists are baked into the live squashfs; there is no post-install package installation step, so the system matches the ISO's rootfs as of build time.
+- Bootloader is GRUB only — no systemd-boot, no rEFInd.
+- Still needs internet on first boot for anything beyond the base.