docs: FT185 contextlib フィールドトライアルレポートを追加#519
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
contextlibモジュール — コンテキストマネージャー・リソース管理・エラー抑制の実装と検証検証内容
@contextmanager、suppress、ExitStack、closing、nullcontextContextDecorator、AbstractContextManager、redirect_stdout/stderrcontextlib.chdir(Python 3.11+)Findings
__exit__戻り値型はbool不可 →Literal[False]が必要（mypy --strict）Test plan
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