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## Why Concurrent callers can submit the same Windows sandbox setup payload while an identical helper invocation is already running. ## What changed - Share one in-flight helper invocation among setup and refresh requests with identical serialized payloads. - Return the shared success or failure to every waiter while preserving structured setup error codes, then allow subsequent requests to run again. ## Testing - Add a concurrency test that verifies identical requests execute the setup operation once. GitOrigin-RevId: 18ebbcb9b36de3eb5912b8bbbe153d39328b5e48