Make the zpool check per-pool with capacity, scrub, and error status

Replace the single "all pools are healthy" summary line with one row
per pool (name, health, capacity) plus a scrub/errors row parsed from
`zpool status <pool>`. A pool that's never been scrubbed but has no
data errors still reports ok - lack of scrub history isn't itself a
failure, only actual reported errors are.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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