docs: sync convention sections with new rules

[froggy1014]

요약

• CONTRIBUTING.md: 브랜치 카테고리 테이블 Slack 컨벤션으로 변경, 브랜치 네이밍 <CATEGORY>/<SUBJECT>-<USERNAME> 형식 반영, 커밋 타입 conventional 11개로 정리
• CLAUDE.md: 커밋/브랜치 컨벤션 섹션 동기화
• AGENTS.md: 커밋 및 PR 가이드라인 섹션 동기화

Closes #235
Closes #236

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LGTM

[G-hoon]

@osohyun0224 님도, 한번 확인 해주시는 게 좋을 것 같아요

[osohyun0224]

@G-hoon 감사합니다 확인했습니다! @froggy1014 정민님 고생많으셨어요! 승인합니다 :)