/prep-pr

Prepare and validate a pull request for an upstream open source contribution.

Steps:

1. Check for CONTRIBUTING.md in the repo and read it
2. Check for .github/PULL_REQUEST_TEMPLATE.md and read it
3. Review all changes on the current branch vs main: git diff main...HEAD
4. Verify scope -- flag any files changed outside the intended fix area
5. Check if tests exist for the changes and if they pass
6. Generate a PR title matching the upstream convention
7. Generate a PR description filling all template fields
8. Check for CLA requirements
9. Show the prepared PR for review before creating

For Airflow specifically:

• Ensure AI disclosure checkbox is included
• Use [component] Description title format
• Verify template rendering tests use create_task_instance_of_operator

Do NOT create the PR automatically -- show the prepared content for user review first.