docs: Version 0.7.0 and CHANGELOG

- VERSION in the entry point, shown in the menu header and the bundle.
- CHANGELOG.md with every commit per version (older versions numbered per merged PR).
- README and AGENTS.md updated for the cachyos-vapor theme, the SteamOS extras and the LED driver.

setup-gamescope-boot.sh

@@ -14,6 +14,9 @@
 
 set -uo pipefail
 
+# Release version, see CHANGELOG.md.
+VERSION=0.7.0
+
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 for lib in common state packages login-manager single-user steam-desktop steam-machine vapor-theme steamos-extras desktop-shortcut menu; do
@@ -23,7 +26,7 @@ done
 
 require_root_helper
 
-echo -e "${c_bold}CachyOS Steam Deck-style Gamescope Boot Wizard${c_reset}"
+echo -e "${c_bold}CachyOS Steam Deck-style Gamescope Boot Wizard${c_reset} v$VERSION"
 echo "Turn the SteamOS-style parts on or off. The menu shows what is on now;"
 echo "anything you turn off is put back the way it was."