feat: Rename to Steamify CachyOS

Menu header, shortcut, release titles, README and AGENTS.md. Repository, script and URLs keep the name cachyos-gamescope-boot.

lib/menu.sh

@@ -15,7 +15,7 @@ declare -A LABEL=(
     [theme]="Install SteamOS theme: Vapor look (cachyos-vapor)"
     [glyphs]="Install Steam Deck/Machine icons: Deck button icons in gaming mode"
     [single]="Single user mode: no password, lock screen or log out (SDDM)"
-    [launcher]="Wizard shortcut: desktop icon to run this wizard again"
+    [launcher]="Steamify shortcut: desktop icon to run this again"
     [machine]="Steam Machine support: LED bar driver, hardware settings in Steam"
     [bios]="Update BIOS"
 )
@@ -104,7 +104,7 @@ run_menu() {
 draw_menu_tui() {
     local cursor="$1" i=0 c box state line
     printf '\033[H\033[2J'
-    echo -e "${c_bold}CachyOS Steam Deck-style Gamescope Boot Wizard${c_reset} v$VERSION"
+    echo -e "${c_bold}Steamify CachyOS${c_reset} v$VERSION"
     echo "Pick what you want. Anything you untick is put back the way it was."
     echo
     MENU_ITEMS=()