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Room-based SFU relay: - Clients join named rooms (room name from QUIC SNI) - Each participant's packets forwarded to all others (no mixing) - Multiple rooms run concurrently on one relay - Web bridge passes room name from URL path to relay Push-to-talk (radio mode): - Toggle "Radio mode" checkbox after connecting - Hold PTT button or spacebar to transmit - Release to mute mic (receive-only) - Works on desktop (spacebar) and mobile (touch) URL routing: - /myroom → joins room "myroom" - Room name input field as fallback Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>