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* fix(ec): delete empty stub replicas before distributing EC shards An interrupted encode can leave a 0-byte .dat replica behind. Until now the only thing that removed it was deleteOriginalVolume, which runs after distribute+mount and calls VolumeDelete -> removeVolumeFiles. A regular volume and an EC volume share the same <collection>_<vid>.vif path, so deleting the stub at that point strips the .vif out from under the freshly distributed shards. Sweep the original replicas with VolumeDelete(OnlyEmpty=true) before distribute: doIsEmpty uses the same superblock threshold, so only the 0-byte stubs go and any data-bearing replica is refused and kept for the post-verify delete. Servers cleared in the sweep are skipped by deleteOriginalVolume so it never touches a server that now holds only EC shards. * fix(ec): fail the encode when an empty-replica sweep can't confirm a node The sweep swallowed every VolumeDelete(OnlyEmpty) error, so a transient failure on a stub node fell through to the post-verify force-delete on that node — the shared-.vif clobber the sweep exists to avoid. Treat only the expected cases (volume not empty, or already gone) as leave-in-place; any other error propagates and fails the encode, which rolls back the readonly marks and retries next cycle.