Add rule_49

[david1-p]

rule_49: 64개 중 54개 성공 (85% 통과율)

9개 테스트 케이스가 실패했습니다.

주요 실패 원인:

Invalid character 오류: 특수 문자들 (―, ∼, ˙, ○, △, □ 등)이 처리되지 않음
인코딩 처리 문제: 일부 유니코드 문자가 제대로 인식되지 않음
따옴표 처리: 인용부호가 포함된 텍스트에서 오류 발생

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5893394

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codecov]

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