fix(shell): assign positional parameters to local variables

Replace direct $1/$2/$3 usage with named local variables in _log(),
msg(), msg_err(), msg_done(), msg_run(), msg_ok(), and array_diff()
(SonarCloud rule shelldre:S7679).

add-submodules.sh

@@ -43,10 +43,11 @@ done
 git config -f .gitmodules submodule.antidote.shallow true
 
 _log() {
+  local msg="$1"
   if command -v msgr > /dev/null 2>&1; then
-    msgr run_done "$1"
+    msgr run_done "$msg"
   else
-    echo "  [ok] $1"
+    echo "  [ok] $msg"
   fi
   return 0
 }