Pull Request

1. Base: default to main. Override with --base <branch> in $ARGUMENTS.
2. Preflight: check git log <base>..HEAD --oneline. If nothing to merge, ask the user what they intended.
3. Push: run git push -u origin $(git branch --show-current). If it fails because the remote has diverged (e.g., after an amend or rebase), tell the user and ask whether to force push (--force-with-lease). Never force push without confirmation.
4. Detect existing PR: run gh pr view --json number,title,body 2>/dev/null. If a PR already exists, go to step 6.
5. Create PR:
   • Gather context: read the commit messages (git log <base>..HEAD). Run /diff <branch> for the full diff.
   • Write description: PRs are hierarchical — they aggregate commits.
     • Single commit: the PR description is the commit message body, reformatted with markdown headings.
     • Multiple commits: ask the user whether to (a) include all commits as-is, (b) squash first then PR, or (c) PR only a subset. Then aggregate the included commit messages. Add Goal/Background/Alternatives only when they provide context the individual commits don't.
     • Use the same body format as /commit (Problem + Solution with ## headings). No "Test plan" or "Summary" sections.
     • Follow the project's PR conventions if documented (e.g., CONTRIBUTING.md).
   • Title: conventional commit style, under 70 characters.
   • Create a unique temp file with mktemp /tmp/pr-body.XXXXXX.md, write the description to it, and run gh pr create --base <base> --title "<title>" -F <temp-file>.
6. Update PR: run /diff <branch> and compare the full diff against the current PR description. If the description no longer accurately reflects the branch's changes, create a unique temp file with mktemp /tmp/pr-body.XXXXXX.md, write the new description to it, and run gh pr edit <number> --title "<title>" -F <temp-file>.