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zm-oai 21c58c90f2 Harden Windows sandbox helper cleanup (#40808 )

## Why

Windows filesystem operations can complete while their helper process remains
alive, and elevated sandbox processes must not survive a disconnected control
pipe.

## What changed

- Read newline-delimited filesystem helper responses without imposing an
  operation deadline, then bound the time spent reaping the helper.
- Drain helper stderr concurrently, retain a bounded diagnostic on failure, and
  kill helpers that do not exit after responding.
- Terminate the elevated runner's job or process when its input pipe closes or
  fails.

## Testing

Added coverage for delayed responses, noisy stderr, stuck helpers, duplicated
file handles, and termination of elevated descendants after a control-pipe
disconnect.

GitOrigin-RevId: c0d3d5d76e13318de17638df4db71fcfb9a7397f

2026-08-26 06:02:56 +00:00