ci: PR 커밋 메시지 commitlint 검사 추가

[jeongph]

PR의 모든 커밋 메시지를 conventional commits 규칙(commitlint.config.mjs)으로 검사한다. rebase 머지가 PR의 개별 커밋을 그대로 main에 올리므로, 커밋별 위생을 CI에서 강제하기 위함. (조직 공통 — pilot·rutter와 동일)

• pull_request 트리거, wagoid/commitlint-github-action@v6가 base..head 전체 커밋을 검사
• commitlint 설정은 이미 있는 commitlint.config.mjs 사용 (husky 로컬 훅과 동일 규칙)
• 이후 ruleset에서 commitlint 체크를 required로 지정 예정

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📥 Commits

Reviewing files that changed from the base of the PR and between 79b8d82 and 5a0acea.

📒 Files selected for processing (1)

• .github/workflows/commitlint.yml

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