feat: FT206 pathlib — Pure パス解析・パストラバーサル防御 (v1.8.83)#573
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- PurePosixPath / PureWindowsPath でファイルシステム非依存のパス解析
- safe_join(): '..' 解決 + ベースパス脱出を is_safe=False で検出
- 絶対パス注入（Path("/base") / "/abs" → ベースが無視される）を threat として検出
- check_traversal(): パストラバーサル脅威の詳細分析 API
- 20 tests passed
- バージョン v1.8.83
Closes #572
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
pathlibモジュールの FT206 実装（Pure パス操作・パストラバーサル防御）Path("/base") / "/abs"はベースが無視されて/absになる（絶対パス注入）実装内容
parse_path_info()safe_join()..解決 + ベース脱出検出analyze_pure_path()check_traversal()Test plan
Closes #572
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