Open PR workflow

Commit and push any local changes to the current branch. Write a PR body that helps reviewers quickly understand the scope, motivation, and validation. Include the linked issue when applicable, a concise summary of the changes, the reasoning behind them, and how they were tested. Run the following command to open a pull request. Finally, report the PR URL.

bunx @willbooster/agent-skills@latest open-pr "feat: concise PR title" <<'EOF'
Close #<issue>

## Summary

- What changed
- Key scope or affected area
- Any notable tradeoff or limitation

## Why