The server answers each player's WebRTC offer (signaled over the socket) with a
connection of its own: frames go on a lossy channel, everything else on a
reliable one, and the socket carries them until both open or where UDP is
blocked. The client's Net now holds one link to the server instead of one per
player. WebRTC takes UDP 47810-47899 by default, set on the command line.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
shweetandClaude Opus 5.5
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