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The RFC 42 settings option derives the Host/Match line from the attribute name. That makes it impossible to express headers that carry Nix string context (e.g. Match exec referring to a store path), and forces long computed patterns into attribute names where a stable logical name would be nicer for dag ordering. Add an explicit `header` option on each block that defaults to the attribute name (with the existing Host/Match prefix detection), and have the legacy matchBlocks shim populate it instead of the __hmSshBlockHeader internal.