refactor(voice): separate Realtime state and resource owners

src/testSupport/readRealtimeSource.mjs

@@ -0,0 +1,23 @@
+import { readFileSync } from 'node:fs';
+
+/** Read voice implementations alongside their compatibility/composition surface. */
+export function readRealtimeSource() {
+  return [
+    'realtimeConnection',
+    'realtimeCost',
+    'realtimeDiagnostics',
+    'realtimeInput',
+    'realtimeInputPolicy',
+    'realtimePreferences',
+    'realtimeProtocol',
+    'realtimeRadio',
+    'realtimeTurns',
+    'realtimeViewport',
+    'realtimeFacade',
+    'realtimeController',
+  ]
+    .map((name) =>
+      readFileSync(new URL(`../voice/${name}.js`, import.meta.url), 'utf8'),
+    )
+    .join('\n');
+}