Benjamin Carlsson 1b53f6a44e Add WebRTC negotiation to the voice host (#42676) ...

## What changed

- Add helper protocol requests to create a WebRTC offer, apply an answer, and report readiness once the ordered `oai-events` data channel opens.
- Support UDP and TCP candidates while bounding signaling size, remote candidates, inbound TCP streams, and WebRTC buffers. Redact session descriptions and peer errors from diagnostics.
- Close unexpected remote data channels and tear down the peer during helper shutdown, including when the parent pipe is lost during startup.

## Testing

- Exercise offer/answer negotiation and clean shutdown over real UDP and TCP sockets.
- Cover signaling validation, candidate and connection limits, early packet loss, slow TCP connection setup, and blocked-startup parent loss.

GitOrigin-RevId: 5f5e60a3a4d1d8eaca2e4724e66284f54061b6af

2026-09-04 05:07:02 +00:00

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