KarpelesLab / bnpm / 23935431370

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Fix Ctrl-C not working in filtered network mode

PID 1 in a PID namespace has special signal semantics: the kernel
silently drops signals from outside the namespace unless PID 1 has
installed a handler. Since we were using unix.Exec() to replace the
child with the target command, signals were lost.

Now the child stays as PID 1 and runs the target as a subprocess,
forwarding SIGINT/SIGTERM/SIGHUP to it.

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

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