fix: accumulate message words instead of overwriting in cmd_continue

The for loop was overwriting message each iteration, causing only
the last word to survive. Changed to accumulate all words with
proper spacing.

Fixes #225

skills/kugetsu/scripts/kugetsu-session.sh

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