Add Claude Code GitHub Workflow

[Xanthorrhizol]

🤖 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!

[Xanclaude]

LGTM. Claude Code Action 워크플로우 두 개 (claude.yml, claude-code-review.yml) 추가.

• Rust 코드 변경 없음
• permissions 모두 read-only (contents: read, pull-requests: read, issues: read) + id-token: write — 쓰기 권한 없어 안전
• CLAUDE_CODE_OAUTH_TOKEN secret이 설정돼 있어야 동작, 없으면 워크플로우만 실패하고 끝
• claude.yml의 actions: read 중복 선언 (27번줄 permissions + 41번줄 additional_permissions) — 무해

머지 OK.