🎨 Palette: 백엔드 패키지 UX/a11y 미적용 일지 작성

[seonghobae]

본 저장소가 프론트엔드가 없는 순수 R 패키지이므로 적용 가능한 UX 요소가 없음을 .Jules/palette.md에 기록하였습니다. 시각적/인터랙티브 요소가 없어 추가적인 코드 수정은 진행하지 않았습니다.

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PR created automatically by Jules for task 7143781700186030676 started by @seonghobae

[google-labs-jules]

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