update-pr-summary

name	update-pr-summary
description	Update pull request (pr) summary
disable-model-invocation	true
argument-hint	<pr-number-or-url>

1. Fetch the current PR description with gh pr view $ARGUMENTS (if no argument provided, omit it to use the current branch's PR)
2. Review the commits and diff with gh pr diff $ARGUMENTS
3. Check whether the description accurately reflects the actual changes (scope, motivation, test plan)
4. Update the description if needed with gh pr edit $ARGUMENTS --body "..."