Pre-Release Polish

Argument (optional): $ARGUMENTS

Setup

The argument selects what gets reviewed:

• Nothing, or a git ref - local mode. Review the working tree or branch (Phase 2).
• A GitHub PR - PR mode. Anything that identifies one counts: a URL, a bare number, "PR 42", "the PR for this branch". Resolve it with gh:
  • In the repo: gh pr view <n> --json title,body,author,baseRefName,headRefName, then gh pr checkout <n>
  • Not in the repo: gh repo clone <owner>/<repo> /tmp/<owner>-<repo>-pr-<n> -- --depth=50 and work there, passing -R <owner>/<repo> to every gh call since a shallow clone has no default remote
  • If the user names an existing clone ("... in ~/pj/my-clone"), use that instead of cloning

Fix mode vs review mode