feat: sync issue triage workflow with dogfooding

[jerop]

This commit synchronizes the issue triage workflow with the version used in dogfooding.

The main changes are:

• Pinning the actions to a specific commit hash to ensure stability.
• Adding a step to post a comment on the issue if the triage fails.

[gemini-cli]

📋 Review Summary

This pull request significantly improves the robustness and user experience of the automated issue triage workflow. By pinning actions to specific commits and adding a clear failure notification mechanism, the changes enhance stability and make debugging easier.

🔍 General Feedback

The move to pin GitHub Actions to specific commit hashes is an excellent security and reliability improvement, preventing unexpected changes from upstream actions. The addition of a failure comment is a thoughtful feature that will greatly improve transparency when the triage process encounters an issue.

✅ Highlights

• Action Pinning: Pinning actions/checkout, actions/create-github-app-token, and actions/github-script to specific commits is a best practice that enhances the security and predictability of the workflow.
• Failure Notification: The new step to post a comment on triage failure is a fantastic addition. It provides immediate feedback and a direct link to the logs, which will be very helpful for troubleshooting.
• Clear Documentation: The README.md has been updated clearly and concisely to reflect the new functionality.

No specific issues were identified in this review. The changes are well-implemented and follow best practices.