[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 GitHub Actions workflows to integrate Claude Code, an AI coding agent, into the repository for automated code assistance and reviews.

• Adds workflow triggered by @claude mentions in PR/issue comments for interactive assistance
• Adds automated code review workflow that runs on all pull requests
• Configures security permissions and tool access for Claude integration

Reviewed Changes

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

File	Description
.github/workflows/claude.yml	Main workflow for interactive Claude assistance triggered by @claude mentions
.github/workflows/claude-code-review.yml	Automated code review workflow that runs on PR creation/updates

---

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

[Copilot]

Remove the trailing whitespace after the API key line to maintain consistent formatting.

Suggested change

[Copilot]

The prompt references 'CLAUDE.md' for style and conventions, but this file doesn't appear to exist in the repository. Either create this documentation file or update the prompt to reference existing style guides.

Suggested change

	Use the repository's CLAUDE.md for guidance on style and conventions. Be constructive and helpful in your feedback.
	Be constructive and helpful in your feedback. If the repository contains a style guide (e.g., CONTRIBUTING.md or STYLEGUIDE.md), follow its guidance for style and conventions.