task_manager: log stdout/stderr correctly for processes

pkgs/clan-cli/clan_cli/task_manager.py

@@ -49,10 +49,11 @@ class Command:
             for fd in rlist:
                 try:
                     for line in fd:
-                        self.log.debug("stdout: %s", line)
                         if fd == self.p.stderr:
+                            self.log.debug(f"[{cmd[0]}] stderr: {line}")
                             self.stderr.append(line)
                         else:
+                            self.log.debug(f"[{cmd[0]}] stdout: {line}")
                             self.stdout.append(line)
                         self._output.put(line)
                 except BlockingIOError: