🛡️ Sentinel: [CRITICAL] 파일 내보내기(Path Traversal) 보안 패치

[seonghobae]

🚨 Severity: CRITICAL
💡 Vulnerability: exportGherkin의 --output 파라미터에서 파일 경로에 대한 유효성 검사가 누락되어 악의적인 경로 지정(../../../etc/passwd 등) 시 작업 디렉토리 밖의 파일에 쓰기가 가능한 경로 탐색 취약점(Path Traversal)이 발생했습니다.
🎯 Impact: 공격자가 시스템의 민감한 파일을 덮어쓰거나 무단으로 파일을 생성할 수 있습니다.
🔧 Fix: path.resolve를 사용해 절대 경로를 계산하고, path.relative와 startsWith(".."), isAbsolute() 검사를 통해 파일이 config.root 내에 안전하게 작성되도록 보장했습니다. 조건을 벗어나는 경우 VspecError 예외를 발생시킵니다.
✅ Verification: pnpm test 및 tests/gherkin.test.ts를 실행하여 새로운 보안 테스트 케이스가 성공적으로 통과하는지 확인했습니다.

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PR created automatically by Jules for task 14781813123307277350 started by @seonghobae

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