The P2b port of setup_custom_tests.sh -> ops.py::pre_install made the 90s bucket-poll timeout a
fatal AssertionError; the original shell hook fell through on timeout BY DESIGN (best-effort) and
the custom-tier MinIO storage test is the real gate for a genuinely missing bucket. Live evidence:
in both M2 sweep failures the bucket landed just after the window and every later tier including
the custom MinIO test passed. Warn loudly + continue, exactly the old semantics.
Adversary-approved fix-forward (REVIEW-rcust 57c66ad, scoped to this raise).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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