fix: remove unnecessary rm of msg file to avoid race condition

skills/kugetsu/scripts/kugetsu-session.sh

@@ -398,7 +398,7 @@ cmd_continue() {
         if [ -z "$session_name" ]; then
             session_name="$arg"
         else
-            message="${message}${message:+ }${arg}"
+            message="$arg"
         fi
     done