Handle client close errors on python 3.14

[nezhar]

Compatibility patch for Python 3.14 to suppress a specific ValueError related to closed HTTP response file pointers, which can occur when using the Docker SDK. The patch is implemented in vibepod/cli.py and is thoroughly tested with new unit tests in tests/test_cli.py.

Python 3.14 compatibility patch:

• Added _install_python314_http_client_flush_patch and _should_ignore_closed_http_response_flush_error functions to vibepod/cli.py to suppress the "I/O operation on closed file." error raised during HTTP response cleanup in Python 3.14. The patch is applied automatically at module import.
• Imported http.client and sys in vibepod/cli.py to support the new patch logic.

[augmentcode]

🤖 Augment PR Summary

Summary: Adds a Python 3.14 compatibility workaround to prevent a Docker-SDK-triggered cleanup error when HTTP responses are finalized.

Changes:

• Introduces a small filter to detect the specific closed-file ValueError during http.client.HTTPResponse.flush
• Installs a runtime patch (Python >= 3.14 only) that wraps HTTPResponse.flush and suppresses that one edge case
• Applies the patch automatically when vibepod.cli is imported
• Adds unit tests covering the filter behavior and that the patch suppresses the targeted error

Technical Notes: The patch is gated by sys.version_info and marked idempotent via a function attribute to avoid double-wrapping.

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[augmentcode]

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