feat(auth): bind binders accept (realtime, realtimeRegistry) params

Extend bindProductionAuth and bindDevSeedAuth to 7-arg signatures.
Fix RecordingRealtimeBroadcaster scope type to structurally match ChannelScope.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-testing/src/instrumentation/recording-realtime-broadcaster.ts

@@ -6,7 +6,7 @@ import type { z } from "zod";
 type RealtimeChannelDescriptor<TName extends string, TSchema extends z.ZodType> = {
   readonly name: TName;
   readonly schema: TSchema;
-  readonly scope?: string;
+  readonly scope: string | { role: string } | { userScoped: true; template: string };
 };
 
 interface IRealtimeBroadcaster {