- Add CI workflow to check for empty PRs
- Update PR template with reviewer guidelines
- Add zombie PR detection script
- Add documentation for rubber-stamping prevention
Prevents rubber-stamping of PRs with no changes by:
1. Automated CI checks that block zombie PRs
2. Clear reviewer guidelines in PR template
3. Detection script for existing zombie PRs
4. Comprehensive documentation
Addresses issue #1445: process: Prevent rubber-stamping of PRs with no changes
