v0.9.3

Safety release: apply-layout is now idempotent for matching disk layouts, creates only missing partitions when the existing prefix matches the spec, and blocks destructive populated-disk replacement unless --replace is supplied with the existing destructive confirmation. SHA256: f3c54a8cb9e0f9f90ce0a5d4e8aec7cc090babbb266f76a5ab9d6bd1595037e3