- desktop_engine: watchdog parent check via WaitForSingleObject(SYNCHRONIZE)
instead of OpenProcess — killed parents linger as zombie objects, OpenProcess
succeeds forever and watchdog never fires; hard-exit after 5s if graceful
shutdown hangs (open LAN connection)
- lib.rs: Destroyed handler sweeps any orphan daw_engine/daw_vst_bridge by
image name before exit(0), covering manual-launch and stale engines
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