make_browsers creates each browser synchronously and adopts it in the
same call, so no view waits on a browser: it leaves before creation
(skipped) or has a browser to close. The late-close branch in
on_after_created is gone. webprobe drops 5 views before the pump and
10 within 27 ms; webview.sh wants all 35 freed before the hold.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>