jif d6fb836f31 Use macOS member fallback in shared process-group termination helpers (#46521) ...

## Why

On macOS, process-group signals can be denied even when individual members can be signalled. Core execution cleanup used helpers that did not retry those signals against group members.

## What changed

- Make `terminate_process_group` and `kill_process_group` use the existing member fallback on macOS, and simplify MCP and pipe callers to use the shared helpers.
- Use the saved process-group ID when escalating cancellation after the termination grace period, so this path also uses the fallback.
- Update the unsafe process-group ID test to exercise `terminate_process_group`.

GitOrigin-RevId: 1bab28d3d53cd401b51ffe71d41fbece12aed66d

2026-09-18 23:59:18 +00:00

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Use macOS member fallback in shared process-group termination helpers (#46521)

2026-09-18 23:59:18 +00:00

readiness

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