[Bug] ConcurrencyExceptionGroup: A child concurrency group did not exit: `modal_load_agent_refs_modal` (state: EXITING). (2 sub-exceptions)

[evgunter]

(testing the bug report functionality by running mng conn then C-cing it until it dies)

Bug Report

An unexpected error occurred during command execution.

Error:

ConcurrencyExceptionGroup: A child concurrency group did not exit: `modal_load_agent_refs_modal` (state: EXITING). (2 sub-exceptions)

Traceback:

Traceback (most recent call last):
  File "/Users/ev/.local/share/uv/tools/mng/lib/python3.13/site-packages/click/core.py", line 1873, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/Users/ev/.local/share/uv/tools/mng/lib/python3.13/site-packages/click/core.py", line 1269, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ev/.local/share/uv/tools/mng/lib/python3.13/site-packages/click/core.py", line 824, in invoke
    return callback(*args, **kwargs)
  File "/Users/ev/.local/share/uv/tools/mng/lib/python3.13/site-packages/click/decorators.py", line 34, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/Users/ev/claude-dockerfile/mng/libs/mng/imbue/mng/cli/connect.py", line 464, in connect
    list_result = list_agents(mng_ctx, is_streaming=False)
  File "/Users/ev/claude-dockerfile/mng/libs/imbue_common/imbue/imbue_common/logging.py", line 66, in wrapper
    result = func(*args, **kwargs)
  File "/Users/ev/claude-dockerfile/mng/libs/mng/imbue/mng/api/list.py", line 190, in list_agents
    _list_agents_batch(
    ~~~~~~~~~~~~~~~~~~^
        mng_ctx=mng_ctx,
        ^^^^^^^^^^^^^^^^
    ...<3 lines>...
        results_lock=results_lock,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/Users/ev/claude-dockerfile/mng/libs/mng/imbue/mng/api/list.py", line 249, in _list_agents_batch
    agents_by_host, providers = load_all_agents_grouped_by_host(mng_ctx, provider_names, include_destroyed=True)
                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ev/claude-dockerfile/mng/libs/imbue_common/imbue/imbue_common/logging.py", line 66, in wrapper
    result = func(*args, **kwargs)
  File "/Users/ev/claude-dockerfile/mng/libs/mng/imbue/mng/api/list.py", line 720, in load_all_agents_grouped_by_host
    with ConcurrencyGroupExecutor(
         ~~~~~~~~~~~~~~~~~~~~~~~~^
        parent_cg=mng_ctx.concurrency_group, name="load_all_agents_grouped_by_host", max_workers=32
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ) as executor:
    ^
  File "/Users/ev/claude-dockerfile/mng/libs/concurrency_group/imbue/concurrency_group/executor.py", line 37, in __exit__
    self._cg.__exit__(exc_type, exc_val, exc_tb)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ev/claude-dockerfile/mng/libs/concurrency_group/imbue/concurrency_group/concurrency_group.py", line 138, in __exit__
    self._exit(exc_value)
    ~~~~~~~~~~^^^^^^^^^^^
  File "/Users/ev/claude-dockerfile/mng/libs/concurrency_group/imbue/concurrency_group/concurrency_group.py", line 154, in _exit
    self._wait_for_all_strands_to_finish_with_timeout(self.exit_timeout_seconds)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ev/claude-dockerfile/mng/libs/concurrency_group/imbue/concurrency_group/concurrency_group.py", line 232, in _wait_for_all_strands_to_finish_with_timeout
    tracked_thread.thread.join(timeout=join_timeout)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ev/claude-dockerfile/mng/libs/concurrency_group/imbue/concurrency_group/thread_utils.py", line 70, in join
    super().join(timeout)
    ~~~~~~~~~~~~^^^^^^^^^
  File "/Users/ev/.local/share/uv/python/cpython-3.13.9-macos-aarch64-none/lib/python3.13/threading.py", line 1094, in join
    self._handle.join(timeout)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^
KeyboardInterrupt

During handling of the above exception, another exception occurred:

  + Exception Group Traceback (most recent call last):
  |   Fil

_(truncated)_