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* Path lock utility for coordination between robustness engine actions Add a utility to ensure path-based synchronization between goroutines. If a path is locked, a subsequent Lock will block if the requested path is the same, or a child/parent (recursive), of the locked path. This assists with coordination between asynchronous robustness engine actions that may rely on the underlying data directory remaining unchanged. For example: - between gathering a filesystem fingerprint and taking a snapshot. - when one WriteFilesAtDepth command has traversed into a directory that another goroutine has picked for deletion. * Fix linter