Every test pins a way the card could start showing a failing or unreadable drive as fine, which is the only failure mode that matters here: nobody investigates a disk that looks healthy.
Covers failure-first ordering, null predictfailure reading as unknown rather than OK, unknown outranking OK, both sources surviving for one drive, order independence, and malformed payloads. The ranking was mutation-checked: swapping the unknown and OK ranks fails the suite.
Also updates the panel count assertion, which correctly caught the new card.
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