`release.py release` refuses while any attempt is outstanding and prints
the abandon command for the operator to copy. When stdin and stdout are
both terminals it now asks `Abandon <ref> and cut a new attempt? [y/N]`
right after that guidance. Yes goes through the same `abandon` as the
subcommand (cancel runs, delete the draft, write the marker) and the cut
continues as the next attempt; the default is no, and anything
non-interactive still refuses as before.
The confirmer and `inspect` are parameters of `release()`, not globals,
so only the CLI entrypoint opts in.
74d788fcc9