Add moonarch-git and sweet-cursors-git PKGBUILDs

moonarch-git packages all desktop environment defaults (XDG configs,
helper scripts, zsh config, wallpaper) for pacman-managed deployment.
Includes moonarch-update for simplified system maintenance.

sweet-cursors-git packages the Sweet cursor theme separately.

README.md

@@ -6,9 +6,11 @@ Arch Linux package builds for the Moonarch ecosystem. Use with [paru](https://gi
 
 | Package | Description |
 |---------|-------------|
+| `moonarch-git` | Desktop environment defaults (Niri, Waybar, Catppuccin Mocha) |
 | `moonset-git` | Wayland session power menu |
 | `moonlock-git` | Wayland lockscreen with PAM and fingerprint support |
 | `moongreet-git` | greetd greeter for Wayland |
+| `sweet-cursors-git` | Sweet cursor theme |
 
 ## Setup
 
@@ -30,7 +32,7 @@ This downloads the PKGBUILDs from Gitea. Without this step, paru will not find t
 ## Install
 
 ```bash
-paru -S moonset-git moonlock-git moongreet-git
+paru -S moonarch-git   # pulls in all ecosystem packages as dependencies
 ```
 
 ## Update