- Added ProcessWaitOptions-based wait APIs with timeoutMs and abort signal support.
- Changed terminate options to accept optional signal for cancellation-aware process shutdown.
- Hardened process identity handling to avoid PID-reuse errors on Linux, macOS, and Windows.
- Updated termination flow to use live descendants and escalate from graceful to hard-kill signals.
- Wrapped awaited Process.fromPid(...).waitForExit() with parentheses before ?? true fallback.
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