When a container is deleted but its snapshot survives (dev image rebuild,
containerd metadata loss, manual ctr deletion), the reconciliation path
previously created a fresh container and unconditionally destroyed the
old snapshot via prepareSnapshot, causing complete data loss.
Manager.Start now detects orphaned snapshots before EnsureBot runs,
exports /data to a backup archive, and restores it into the new
container's snapshot before the task starts.
BBQ
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