⚡ Feature: GitHub Checks API Integration

[jordanpartridge]

Summary

Integrate GitHub Checks API to display CI/CD status, test results, and automated checks within PR review workflows.

Acceptance Criteria

• Fetch GitHub checks for specific PRs and commits
• Rich console display of check status (pending, success, failure)
• Show check details including logs and annotations
• Support for different check types (CI, tests, security scans)
• Color-coded status indicators and summary views
• Integration with prs:review command via --with-checks flag