Go CLI Process Control

Treat child-process lifecycle as correctness. Observe the terminal result, propagate cancellation, and clean up every process, pipe, and temporary resource.

Core Workflow

1. Define the child executable, argv, environment, directory, streams, and success contract.
2. Use an explicit shell only when shell semantics are actually required.
3. Inject a runner boundary and propagate the caller's context.
4. Observe startup and completion; preserve status and useful redacted stderr.
5. Bound captured output, cancellation, and shutdown time.
6. Account for descendants and wait for every pipeline stage.
7. Test missing tools, bad exits, malformed output, cancellation, signals, and cleanup.

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