Debug aid: when set in headed mode, the crawler blocks on Ctrl+C at
every shutdown point (early auth bails + normal completion) instead
of closing the browser immediately. Operator can inspect DOM, cookies,
and network state in the visible Chromium window before exit.
Ignored in headless (no window to inspect) — logged as a warning if
set under headless so the operator doesn't sit waiting.
chromiumoxide's `Browser` is `kill_on_drop`, so the close-or-wait
helper must await Ctrl+C *before* the Handle is dropped — otherwise
the Chromium child gets killed out from under the operator.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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