fix: harden parMap cancellation and async boundary liveness#10
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Summary
parMapbatch execution internals with cancellation-aware completion-service schedulingAwait.resultwaits fromparMapexecution path and preserve ordered output mappingStream.ensuringerror precedence by preserving processing errors and suppressing close failuresasyncBoundaryproducer liveness with bounded offer loops, stall detection, and consumer-signal trackingparMapcancellation and async-boundary producer cleanup on downstream failureWhy
Validation
sbt testpasses (30 tests)sbt -Dsbt.supershell=false "Test / runMain SimpleStreamProcessor.BackpressureStressValidation 10000"passes