On filesystems without atomic no-replace rename, the degraded
publication moves the source children into a fresh claim and leaves an
emptied source shell for the caller to remove once the move is
confirmed. If that removal failed, moveSkillPathRecoverably reported a
plain failure claiming both locations were preserved while the data
existed only at the destination, so backupAndRemoveSkillDir never
recorded the backup and the original path was left empty. Move the
children back into the shell and withdraw the destination instead; a
failed retraction reports the data location explicitly. Restores the
contract that a failed move keeps the source intact.
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