🛡️ Sentinel: 입력값 검증 강화에 따른 정수 오버플로우 취약점 수정

[seonghobae]

🛡️ Sentinel: 정수 오버플로우를 유발할 수 있는 사용자 입력 정규식 검증 취약점 수정

readline()의 입력값 검증 시 단순 숫자 확인을 위한 ^[0-9]+$ 정규식을 정확한 기대값인 ^[12]$로 수정하여 as.integer() 호출 시 매우 큰 숫자로 인해 발생하는 정수 오버플로우 크래시 취약점을 방지했습니다.
또한 .jules/sentinel.md 파일에 해당 보안 취약점의 원인과 예방 조치에 대한 학습 내용을 기록했습니다.

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PR created automatically by Jules for task 5689218896160326034 started by @seonghobae

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[seonghobae]

Closing as superseded by #249.

Same ^[0-9]+$ → ^[12]$ regex-only slice with a Sentinel journal note and no prompt-path tests. Land #249 instead.