Allow KuboCAS to reopen after being closed

[0xSwego]

Summary

• allow _loop_client to lazily recreate a new httpx client after aclose
• test KuboCAS client reopening behaviour

Testing

• uv run pre-commit run --all-files --show-diff-on-failure
• uv run pytest --cov (fails: DeadlineExceeded in test_fuzz; ConnectError in public gateway tests)
• uv run pytest tests/test_kubocas_session.py::test_loop_client_reopens_after_close -q

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https://chatgpt.com/codex/tasks/task_e_689f55c5b4508324ad8439113bfe0421

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/fix-runtimeerror-with-kubocas-instance

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7094b5f) to head (0f56989).

Additional details and impacted files

@@                  Coverage Diff                   @@
##           ci/update-zarr-3.0.9       #81   +/-   ##
======================================================
  Coverage                100.00%   100.00%           
======================================================
  Files                         5         5           
  Lines                       670       673    +3     
======================================================
+ Hits                        670       673    +3     

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