feat: FT214 io モジュール — StringIO / BytesIO / TextIOWrapper / BufferedReader#599
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…eader (#598) - StringIO: テキストバッファ書き込み・読み取り・行イテレーション - BytesIO: バイナリバッファ操作・hex デコード - TextIOWrapper: エンコーディング変換往復確認（utf-8/utf-16/latin-1/ascii） - BufferedReader: シーク操作（seek/tell） - F-1: StringIO.tell() のタイミング依存性（書き込み後 vs read 後） - F-2: TextIOWrapper は write_through=True が必要 - 22 テスト全通過、mypy --strict / ruff / pip-audit 全クリア - v1.8.90 → v1.8.91 Closes #598 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
StringIO: テキストバッファの書き込み・読み取り・行イテレーションBytesIO: バイナリバッファ操作・hex デコードTextIOWrapper: エンコーディング変換往復確認（utf-8/utf-16/latin-1/ascii）BufferedReader: シーク操作（seek / tell）StringIO.tell()のタイミング依存性を発見（書き込み後 vs read 後で値が異なる）TextIOWrapperはwrite_through=Trueが必要（バッファリング問題）Test plan
pytest)mypy --strict通過ruff check/ruff format --check通過pip-audit— 既知 CVE なしCloses #598
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