Add Claude PR Assistant workflow

[markshust]

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[what-the-diff]

PR Summary

• Introduction of New GitHub Actions Workflow
  A new "GitHub Actions" workflow named 'claude.yml' has been added to the repository. This workflow is a set of automated procedures that take action in response to specific events, enhancing productivity and efficiency.

• Event-Driven Actions
  This workflow dynamically responds to specific events. These events include when comments are added to issues or pull request reviews, when issues are opened or assigned, and when reviews are submitted for pull requests.

• New 'claude' Job
  The workflow consists of a job called 'claude', designed to scan for the presence of '@claude' in comments and issues. This can be useful for automatically triggering specific actions based on this marker.

• Workflow Environment and Permissions
  This workflow operates on the latest version of Ubuntu and includes defined permissions for accessing repository content, pull requests, and issues, ensuring a consistent and secure operating environment.

• Use of Claude-code-action
  As a part of its process, the workflow checks out the repository and executes the 'claude-code-action' (a predefined sequence of operations) under the 'anthropics' umbrella. This action uses a specific API key, reinforcing security for these operations.