* Add PR review automation workflow and script
closes#559
* Improve PR review automation with better error handling and permissions
* Update PR review automation to use pull_request_target event for improved security
* Fix PR automation to handle cross-repo references correctly
- Use SHA instead of ref names to avoid 404 errors
- Handle head content from source repo and base from target repo
- Add better error handling and debugging info
- Prevent workflow failures when API check fails
