feat(audit): address batch 3 of missing scripts

- Implement nomarchy-pkg-install, nomarchy-pkg-drop, nomarchy-pkg-aur-add (stub)
- Implement nomarchy-theme, nomarchy-font, nomarchy-wallpaper wrappers
- Update docs/SCRIPTS.md with 'kept' status for new scripts

features/scripts/utils/nomarchy-theme

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+# Nomarchy Theme Helper
+# Usage: nomarchy-theme [selector|set <name>|list]
+
+COMMAND="$1"
+
+case "$COMMAND" in
+    set)
+        shift
+        nomarchy-theme-set "$@"
+        ;;
+    list)
+        nomarchy-theme-list
+        ;;
+    selector|*)
+        nomarchy-theme-selector
+        ;;
+esac