ZelAnton / ProcessKit-rs / 29076573459

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Surface stdout/stderr read errors instead of a silent partial capture

pump_lines_core and the raw output_bytes stdout loop used to swallow OS read
errors and hand back a truncated capture as a plain success. Thread the read
error through the pump JoinHandle and the raw reader seam so output_string,
finish, wait, and profile report Error::Io for an incomplete capture instead
of silently returning a partial one, while keeping the existing bounded
teardown and best-effort handler/tee semantics.

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