refactor(wrapper): update dry-run message to align with existing session delegation

.agents/skills/multi-agent-mux-delegate-job/multi-agent-mux-delegate-job

@@ -168,9 +168,10 @@ run_agent() {
     echo "[human agent] complete the task, then run publish_event.py --event completed"
     return
   fi
+  local sess="${AGENT_SESSION#tmux:}"
 
   if [[ "$DRY_RUN" == "1" ]]; then
-    echo "[dry-run] would launch agent '$AGENT' in a fresh tmux session with instructions:"
+    echo "[dry-run] would delegate task to running agent '$AGENT' in tmux session '$sess' with instructions:"
     echo "----"; echo "$instructions"; echo "----"
     return
   fi
@@ -186,8 +187,6 @@ run_agent() {
     _tmux="tmux -L $TMUX_SERVER_NAME"
   fi
 
-  local sess="${AGENT_SESSION#tmux:}"
-  
   if ! $_tmux has-session -t "$sess" 2>/dev/null; then
     echo "ERROR: 에이전트 세션 '$sess'이 존재하지 않습니다. 작업을 위임하기 전에 먼저 에이전트 세션을 기동해 주세요." >&2
     echo "       팁: 'multi-agent-mux-resume' 또는 'multi-agent-mux-create'를 통해 에이전트를 먼저 생성할 수 있습니다." >&2