KarpelesLab / bnpm / 23934903933

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Fix ~25s delay on exit in filtered network mode

Set the TAP fd to non-blocking before wrapping in os.NewFile so Go's
runtime poller manages it. This lets Close() properly unblock a
concurrent Read(), instead of the read syscall blocking until the
slirp maintenance ticker fires.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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