AFailedBeltTaskSurfacesOnce swapped a belt's asteroids while that belt's task
could still be running, so it failed in 5 of 8 runs including unmutated ones
(Soul S1). It tests belt-task machinery that codex/mining deletes (Cut 1,
22a54ccb), so it goes rather than being reworked.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>