The rule (drivertable::install_hold_keys): a driver install on a card the app reads as external (the eGPU kind from update-return-21b) stops that card's worker before the installer starts, through the cards path with the restore choice kept (the --cards-off shape); the vendor's cards inside the case and every other vendor's card keep mining. The row says so before the click and while it runs (the display reset can take the machine for a minute and may need a restart; save your work first). When the installer ends the held card goes back as it was; a card the install took away comes back when the card does (driver_release_held on the detection that lists it again). The app never restarts the machine.
Tests: the known-failed rule test first (an install on an eGPU card with the worker still running held nothing: red on build-2, then green), the view test for the two sentences; box gate 258 + 33 + 8 (test --release on build-2). Mock scenarios drivers-egpu and drivers-egpu-running; captures 13 to 16 (light and dark). Branch rebased onto release-0.3.21, which already carries the driver-check commits; the earlier tip is kept as driver-check-0320.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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