[CDX-265] Add Claude Code GitHub Workflow

[esezen]

🤖 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!

[Copilot]

Pull Request Overview

This PR adds Claude Code integration to the repository through two GitHub Actions workflows that enable AI-powered code assistance and automated code reviews.

• Adds a Claude Code workflow that responds to @claude mentions in PR/issue comments
• Adds an automated Claude Code Review workflow that runs on pull request events
• Configures appropriate permissions and security settings for both workflows

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/claude.yml	Main Claude Code workflow triggered by @claude mentions in comments
.github/workflows/claude-code-review.yml	Automated code review workflow for pull requests

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

The workflow permissions include 'actions: read' but Claude will need write permissions to create comments, branches, and commits as described in the PR description. Consider adding 'pull-requests: write' and 'contents: write' permissions.

Suggested change

	contents: read
	pull-requests: read
	contents: write
	pull-requests: write

[Copilot]

The workflow lacks 'pull-requests: write' permission but line 49 indicates Claude should use 'gh pr comment' to leave review comments. Add 'pull-requests: write' permission to enable comment creation.

Suggested change

	pull-requests: read
	pull-requests: write

[Copilot]

The 'additional_permissions' setting duplicates the 'actions: read' permission already granted in the permissions section above (line 26). This duplication is unnecessary and could cause confusion.

Suggested change

	additional_permissions: |
	actions: read