fix: packages.conf format, add init icons, instant wallpaper

- packages.conf: fix operations format (strings -> empty list)
- netinstall.yaml: remove empty Style group
- packagechooser.conf: add Breeze-style init system SVG icons
- wallpaper: pre-bake config in skel for instant wallpaper, remove wait loop
- AGENTS.md: add GPG signing instructions

iso-profiles/antergos/root-overlay/usr/local/bin/set-antergos-wallpaper.sh

@@ -22,17 +22,7 @@ fi
 
 echo "[$(date)] Wallpaper found, applying..." >> "$LOG"
 
-# Wait for Plasma shell to be ready
-for i in 1 2 3 4 5; do
-  if qdbus org.kde.plasmashell >/dev/null 2>&1; then
-    echo "[$(date)] Plasmashell ready on attempt $i" >> "$LOG"
-    break
-  fi
-  echo "[$(date)] Waiting for plasmashell... (attempt $i)" >> "$LOG"
-  sleep 2
-done
-
-echo "[$(date)] Trying plasma-apply-wallpaperimage..." >> "$LOG"
+echo "[$(date)] Applying wallpaper..." >> "$LOG"
 /usr/bin/plasma-apply-wallpaperimage "$WALLPAPER" >> "$LOG" 2>&1
 RC=$?
 echo "[$(date)] plasma-apply-wallpaperimage exit code: $RC" >> "$LOG"