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* ec: don't index ev.Shards[0] when the last shard was unmounted * ec: skip a runtime emptied before the scrub merge reads its shards FindAllEcVolumes releases each location lock before MergeEcRuntimes runs, so an unmount can leave a merged runtime with no shards and the width scan indexed Shards[-1]. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * ec: treat a scrub merge with no shard left as a vanished volume Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * ec: read Shards once in ShardSize so a concurrent unmount cannot empty it Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * ec: read each runtime's Shards once in the scrub merge The vanished check and the slot construction read Shards separately, so an unmount between them produced a non-nil view with no shards. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * ec: anchor the scrub merge on a generation that still holds shards An unmount can empty the newest runtime while an older one keeps its shards, which left a merged view anchored on the emptied generation with no slots and the holder reported as skipped. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Mansur Akhmadi <10739460+mansur-akhmadi@users.noreply.github.com> Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>