feat: enhance agent management with support for multiple instances and update UI accordingly

cmd/agentctl/main.go

@@ -74,14 +74,15 @@ func listCmd(mgr *process.Manager) *cobra.Command {
 				return nil
 			}
 
-			fmt.Printf("%-20s  %-12s  %-8s  %s\n", "ID", "STATUS", "VERSION", "DESCRIPTION")
-			fmt.Println(strings.Repeat("─", 72))
+			fmt.Printf("%-20s  %-14s  %-8s  %-4s  %s\n", "ID", "STATUS", "VERSION", "INST", "DESCRIPTION")
+			fmt.Println(strings.Repeat("─", 78))
 			for _, s := range statuses {
-				fmt.Printf("%-20s  %-12s  %-8s  %s\n",
+				fmt.Printf("%-20s  %-14s  %-8s  %-4d  %s\n",
 					s.ID,
 					statusLabel(s),
 					s.Version,
-					truncate(s.Desc, 36),
+					s.Instances,
+					truncate(s.Desc, 32),
 				)
 			}
 			return nil
@@ -112,18 +113,13 @@ func startCmd(mgr *process.Manager, binPath *string) *cobra.Command {
 					fmt.Printf("skip  %-20s  (disabled in config)\n", s.ID)
 					continue
 				}
-				if s.Running {
-					fmt.Printf("skip  %-20s  (already running, PID %d)\n", s.ID, s.PID)
-					continue
-				}
-
 				if err := mgr.Start(s.AgentInfo); err != nil {
 					fmt.Fprintf(os.Stderr, "fail  %-20s  %v\n", s.ID, err)
 					continue
 				}
 
-				fmt.Printf("start %-20s  PID %d  log → %s\n",
-					s.ID, mgr.ReadPID(s.ID), mgr.LogPath(s.ID))
+				fmt.Printf("start %-20s  PID %d  (instances: %d)  log → %s\n",
+					s.ID, mgr.ReadPID(s.ID), mgr.InstanceCount(s.ID), mgr.LogPath(s.ID))
 				started++
 			}
 
@@ -244,6 +240,9 @@ func statusLabel(s process.AgentStatus) string {
 	case !s.Enabled:
 		return "disabled"
 	case s.Running:
+		if s.Instances > 1 {
+			return fmt.Sprintf("● running(%d)", s.Instances)
+		}
 		return "● running"
 	default:
 		return "○ stopped"