Create a PR

Step 1: Branch

git fetch upstream
git branch --show-current
git log --oneline upstream/main..HEAD
git diff upstream/main --stat
gh pr list --head "$(git branch --show-current)" --state open

Present the summary and ask before proceeding:

"You are currently on branch <branch>. It has <N> commit(s) ahead of upstream/main touching: <files>. [If an open PR exists]: This branch already has an open PR: <url>. Pushing here would add commits to that existing PR. Should I create a new branch from upstream/main (recommended), or use the current branch?"

Do not continue until the user answers.