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* fix(ec): prefer credible replica as canonical metric in EC detection An interrupted encode can leave a 0-byte .dat replica behind. When that stub sits on a lower-sorting server than the real replica, the lowest-server canonical pick reported Size=0, tripped the min-size gate, and the volume was stranded in skippedTooSmall: detection never proposed an encode, so the partial EC shards were never cleared and re-distribute kept hitting the mounted-volume guard. selectCanonicalMetric now prefers the lowest-server credible replica (data-bearing, not already EC), falling back to the lowest-server metric only when nothing is credible so the downstream gates skip as before. A leftover EC shard set on a lower server no longer short-circuits the volume at the IsECVolume guard either, so the orphan-source cleanup and re-encode paths get their chance. * fix(ec): treat a bare superblock .dat as a stub too An interrupted encode or copy can write the 8-byte superblock and then fail, leaving an 8-byte .dat with no data. isStubReplica used a strict < so that file slipped through as credible, could win the canonical pick on a low server, and re-tripped the min-size gate. Use <= the superblock so a data-less .dat never shadows a real replica.