feat: dev → main Release PR 자동 생성 워크플로우 추가

[sumi-0011]

Summary

• dev 브랜치에 push 시 커밋 타입별 릴리즈 노트를 자동 생성하는 GitHub Actions 워크플로우 추가
• 기존 dev → main PR이 있으면 업데이트, 없으면 새로 생성
• 커밋 컨벤션(feat/fix/refactor 등) 기반 분류 + semver 자동 계산

변경 파일

• .github/workflows/release-pr.yml — 워크플로우 본체
• docs/superpowers/specs/ — 설계 스펙
• docs/superpowers/plans/ — 구현 계획

동작 방식

1. dev push → 워크플로우 트리거
2. main..dev 커밋 파싱 → 타입별 그룹핑
3. 최근 [RELEASE] 커밋에서 버전 추출 → semver bump
4. gh pr create/edit로 PR 생성/업데이트

🤖 Generated with Claude Code

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