docs(auditlog): mark follow-ups complete in roadmap; refresh stale comments

src/ScadaLink.Host/Actors/AkkaHostedService.cs

@@ -681,9 +681,10 @@ akka {{
         // Per Bundle E's brief: the SiteAuditTelemetryActor takes its
         // collaborators through its constructor, so we resolve them from DI
         // and pass them in via Props.Create rather than relying on a future
-        // FactoryProvider. This also lets the M6 follow-up swap the
-        // NoOpSiteStreamAuditClient registration for the real gRPC client
-        // without touching this site wiring.
+        // FactoryProvider. The real site→central client is constructed and
+        // wired immediately below: a ClusterClientSiteAuditClient (ClusterClient
+        // transport, not gRPC) replaces the DI-default NoOpSiteStreamAuditClient
+        // for site roles, without disturbing the rest of this wiring.
         var siteAuditOptions = _serviceProvider
             .GetRequiredService<IOptions<ScadaLink.AuditLog.Site.Telemetry.SiteAuditTelemetryOptions>>();
         var siteAuditQueue = _serviceProvider