Add Claude Code GitHub Workflow

[kiyeonjeon21]

🤖 Installing Claude Code GitHub App

This PR adds a GitHub Actions workflow that enables Claude Code integration in our repository.

What is Claude Code?

Claude Code is an AI coding agent that can help with:

• Bug fixes and improvements
• Documentation updates
• Implementing new features
• Code reviews and suggestions
• Writing tests
• And more!

How it works

Once this PR is merged, we'll be able to interact with Claude by mentioning @claude in a pull request or issue comment.
Once the workflow is triggered, Claude will analyze the comment and surrounding context, and execute on the request in a GitHub action.

Important Notes

• This workflow won't take effect until this PR is merged
• @claude mentions won't work until after the merge is complete
• The workflow runs automatically whenever Claude is mentioned in PR or issue comments
• Claude gets access to the entire PR or issue context including files, diffs, and previous comments

Security

• Our Anthropic API key is securely stored as a GitHub Actions secret
• Only users with write access to the repository can trigger the workflow
• All Claude runs are stored in the GitHub Actions run history
• Claude's default tools are limited to reading/writing files and interacting with our repo by creating comments, branches, and commits.
• We can add more allowed tools by adding them to the workflow file like:

allowed_tools: Bash(npm install),Bash(npm run build),Bash(npm run lint),Bash(npm run test)

There's more information in the Claude Code action repo.

After merging this PR, let's try mentioning @claude in a comment on any PR to get started!

[kiyeonjeon21]

코드 리뷰

🔴 버그 — pull-requests: write 권한 누락

두 워크플로우 모두 pull-requests: read만 있어서 PR에 코멘트를 달 수 없습니다.

claude-code-review.yml:
```yaml
permissions:
contents: read
pull-requests: write # read → write 로 변경 필요
issues: read
id-token: write
```

claude.yml:
```yaml
permissions:
contents: write # 파일 수정 가능하게
pull-requests: write # read → write 로 변경 필요
issues: write # read → write 로 변경 필요
id-token: write
actions: read
```

🟡 개선 — additional_permissions 중복

claude.yml의 additional_permissions: actions: read는 이미 permissions 블록에 선언되어 있어 중복입니다. 제거해도 됩니다.

🟡 개선 — plugin_marketplaces URL 확인 필요

claude-code-review.yml의 plugin_marketplaces: 'https://github.com/anthropics/claude-code.git' — 공식 마켓플레이스 URL이 맞는지 확인 필요합니다.