🛡️ Sentinel: [MEDIUM] Fix stack overflow DoS in interactive prompts

[seonghobae]

🚨 Severity: MEDIUM
💡 Vulnerability: checkCorrect, checkoldformBILOGprior, checknewformBILOGprior 함수에서 잘못된 입력 시 재귀적으로 readline()을 호출하여 스택 오버플로우(Denial of Service)를 유발할 수 있는 취약점이 발견되었습니다.
🎯 Impact: 사용자가 잘못된 입력을 반복하거나 비대화형 환경에서 EOF가 지속적으로 입력될 경우 R 세션이 크래시될 수 있습니다.
🔧 Fix: 무한 재귀 호출을 while 루프로 변경하여 안전하게 입력을 처리하도록 수정했습니다.
✅ Verification: 테스트 스위트를 실행하여 회귀 문제가 없음을 확인했습니다 (Rscript -e "testthat::test_dir('tests/testthat')").

• 모든 변경 사항은 한국어로 작성되었습니다.

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PR created automatically by Jules for task 637614510425058634 started by @seonghobae

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