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  "classification": "python_concurrency_fixture_aligned_with_atomic_staged_publication",
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  "original_future_timeout_ms": 5000,
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  "notes": "The old fixture relied on the core lock as an implicit publication barrier. First-read and EOF gates now require concurrent metadata completion and absent exists/list/prefix views before successful EOF, retain every original final metadata assertion and verify the full body afterward. The original2s start/5s future/20s subprocess bounds remain. The first5s-start candidate is preserved separately and is not the accepted fixture. No production change was needed."
}