feat: add Refresh command to re-detect session state

- Expose via Acme tag bar and 9P ctl file
- No arg refreshes all sessions, with arg refreshes one

internal/p9/server.go

@@ -331,7 +331,7 @@ func (s *Server) write(cs *connState, fc *plan9.Fcall) *plan9.Fcall {
 		}
 		args := strings.Fields(input)
 		if len(args) == 0 {
-			return errFcall(fc, "usage: stop | kill")
+			return errFcall(fc, "usage: stop | kill | refresh")
 		}
 		switch args[0] {
 		case "stop":
@@ -342,6 +342,11 @@ func (s *Server) write(cs *connState, fc *plan9.Fcall) *plan9.Fcall {
 		case "kill":
 			sess.Close()
 			s.mgr.Remove(sess.ID())
+		case "refresh":
+			ctx := context.Background()
+			if err := sess.Refresh(ctx); err != nil {
+				return errFcall(fc, err.Error())
+			}
 		default:
 			return errFcall(fc, "unknown command")
 		}

main.go

@@ -91,7 +91,7 @@ func main() {
 	defer w.CloseFiles()
 
 	w.Name(windowName)
-	w.Write("tag", []byte("Get Attach Kill Alias Context Sandbox "))
+	w.Write("tag", []byte("Get Attach Kill Refresh Alias Context Sandbox "))
 	refreshList(w, mgr)
 	w.Ctl("clean")
 
@@ -217,6 +217,23 @@ func main() {
 					srv.OnAliasChange(sess)
 				}
 				refreshList(w, mgr)
+			case "Refresh":
+				if arg == "" {
+					// Refresh all sessions
+					for _, id := range mgr.List() {
+						if sess := mgr.Get(id); sess != nil {
+							sess.Refresh(context.Background())
+						}
+					}
+				} else {
+					sess := mgr.Get(arg)
+					if sess == nil {
+						fmt.Fprintf(os.Stderr, "Session not found: %s\n", arg)
+						continue
+					}
+					sess.Refresh(context.Background())
+				}
+				refreshList(w, mgr)
 			case "Context":
 				if arg == "" {
 					fmt.Fprintf(os.Stderr, "Usage: Context <session-id>\n")