main: --serial-sock PATH - link port over a unix socket (net + live display)

The serial fds are serviced by cpu_step in every mode, so wiring them to a
connected unix socket lets networking run alongside a live display (--sixel /
terminal) - unlike --headless, which needs stdio for the serial. The emulator
connects to PATH (retrying ~1s so a launcher can listen first) and uses it
non-blocking with no EOF-exit; it overrides the headless stdio serial.

Pairs with gbos tools/netboot, which listens on PATH, brings up a TUN+NAT, and
bridges the socket <-> TUN. In windowed mode the OSK is the console and the
link port is pure network - cleanly separated. Verified: host pings the GB 3/3
over the socket link.

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