refactor(comm): retire ClusterClient naming after the gRPC cutover

Phase 4 of the ClusterClient -> gRPC migration deleted the Akka transports
but left the naming behind: `ClusterClientSiteAuditClient` was transport-
agnostic and worked unchanged, so it survived the deletion under a name
that now describes a transport the repo no longer has. Same for a scatter
of doc-comments still framing gRPC as "the new transport" beside an Akka
one that is gone.

Renames it to `SiteCommunicationAuditClient` (and its test file) and
rewrites the stale comments to describe the single transport that exists.
Also tightens CLAUDE.md: drops the self-describing directory listing and
the 27-component enumeration in favour of the non-obvious parts only.

Behaviour-neutral: names and prose only. Recorded as the Phase 4
follow-up in docs/plans/2026-07-22-clusterclient-to-grpc-plan.md.

src/ZB.MOM.WW.ScadaBridge.ManagementService/ManagementActor.cs

@@ -38,7 +38,7 @@ using ZB.MOM.WW.ScadaBridge.TemplateEngine.Services;
 namespace ZB.MOM.WW.ScadaBridge.ManagementService;
 
 /// <summary>
-/// Central actor that handles all management commands from the CLI (via ClusterClient).
+/// Central actor that handles all management commands from the CLI (via the HTTP /management endpoint).
 /// Receives ManagementEnvelope messages, authorizes based on roles, then delegates to
 /// the appropriate service or repository using scoped DI.
 /// </summary>
@@ -477,7 +477,7 @@ public class ManagementActor : ReceiveActor
             // NOTE: ResolveRolesCommand is intentionally NOT dispatched. The two-step
             // "ResolveRoles + command" flow is retired — the HTTP endpoint performs LDAP
             // auth and role resolution itself before sending a single envelope. Leaving a
-            // handler would expose role-mapping data to any raw ClusterClient sender with
+            // handler would expose role-mapping data to any raw in-cluster sender with
             // no role requirement; the command now falls through to the default below.
             _ => throw new NotSupportedException($"Unknown command type: {command.GetType().Name}")
         };