feat(runtime): refactor runtime state and proxy event handling for typed WebRTC linking and shared status models

ts/webrtcbridge.ts

@@ -5,8 +5,8 @@
  * - Browser device registration/unregistration via WebSocket
  * - WS → deviceId mapping
  *
- * All WebRTC media logic (PeerConnection, RTP, transcoding) lives in
- * ts/call/webrtc-leg.ts and is managed by the CallManager.
+ * All WebRTC media logic (PeerConnection, RTP, transcoding, mixer wiring)
+ * lives in the Rust proxy-engine. This module only tracks browser sessions.
  */
 
 import { WebSocket } from 'ws';
@@ -39,7 +39,7 @@ export function initWebRtcSignaling(cfg: IWebRtcSignalingConfig): void {
 
 /**
  * Handle a WebRTC signaling message from a browser client.
- * Only handles registration; offer/ice/hangup are routed through CallManager.
+ * Only handles registration; offer/ice/hangup are routed through frontend.ts.
  */
 export function handleWebRtcSignaling(
   ws: WebSocket,
@@ -51,7 +51,7 @@ export function handleWebRtcSignaling(
     handleRegister(ws, message.sessionId!, message.userAgent, message._remoteIp);
   }
   // Other webrtc-* types (offer, ice, hangup, accept) are handled
-  // by the CallManager via frontend.ts WebSocket handler.
+  // by the frontend.ts WebSocket handler and forwarded to Rust.
 }
 
 /**
@@ -64,13 +64,6 @@ export function sendToBrowserDevice(deviceId: string, data: unknown): boolean {
   return true;
 }
 
-/**
- * Get the WebSocket for a browser device (used by CallManager to create WebRtcLegs).
- */
-export function getBrowserDeviceWs(deviceId: string): WebSocket | null {
-  return deviceIdToWs.get(deviceId) ?? null;
-}
-
 /**
  * Get all registered browser device IDs.
  */