Fix deadlock in syncLocal when receiver fails partway - #18
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Neither side closed its io.Pipe half on failure, so the sender goroutine hung forever waiting for a reply that would never come. Caught by CI's -race leg on Linux; passed instantly on Windows without -race. Fixed by closing owned pipe halves on any return path.
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Neither side closed its io.Pipe half on failure, so the sender goroutine hung forever waiting for a reply that would never come. Caught by CI's -race leg on Linux; passed instantly on Windows without -race. Fixed by closing owned pipe halves on any return path.