Skip idle close peer update scans#812
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Stacked on #809.
Avoid calling updateAll() when a closing peer has no inflight request, manifest request, or pending local work to reschedule.
The updateAll() path is preserved when there is inflight work, manifest work, queued blocks, seeks, ranges, reorgs, or upgrades. This is a narrow idle-close cleanup, not the main blind-peer CPU profile fix.