[WIP] Fix race condition in write_bytes_lock_held function

[Copilot]

• Inspect CPython policy, CI failure logs, and BytesIO write path
• Implement minimal BytesIO pre/post state checks around buffer acquisition
• Add or confirm focused regression coverage for concurrent close/export cases
• Build and run targeted io tests to verify the fix
• Scan changed files for secrets, run validation, and summarize results

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