docs+chore: fix stale prose, project names, remove dead MapSqlException (§7)

- docs/plans/2026-06-14-deferred-followups.md: mark D1 as executed
  (commit 4af24b9; metric emitted at DashboardSnapshotService.cs:198);
  note D2 resolved as no-op; D3-D5 remain pending
- docs/AlarmClientDiscovery.md §5: rewrite STA "production fix needed"
  to past tense — alarms now route through GatewayAlarmMonitor/worker STA
- EventsHub.cs: replace stale "publisher side is a future follow-up"
  comment; DashboardEventBroadcaster is live and DI-registered
- CLAUDE.md: fix all project-name drift (src/MxGateway.* →
  src/ZB.MOM.WW.MxGateway.*; MxGateway.sln → ZB.MOM.WW.MxGateway.slnx;
  clients/dotnet/MxGateway.Client.sln → ZB.MOM.WW.MxGateway.Client.slnx)
- GalaxyRepositoryGrpcService.cs: remove dead MapSqlException method and
  its IDE0051 suppression pragma; drop now-unused ILogger ctor param and
  Microsoft.Data.SqlClient using; build confirmed 0 warnings/errors

src/ZB.MOM.WW.MxGateway.Server/Grpc/GalaxyRepositoryGrpcService.cs

@@ -1,6 +1,5 @@
 using Google.Protobuf.WellKnownTypes;
 using Grpc.Core;
-using Microsoft.Data.SqlClient;
 using ZB.MOM.WW.MxGateway.Contracts.Proto.Galaxy;
 using GalaxyDb = ZB.MOM.WW.MxGateway.Server.Galaxy;
 using ZB.MOM.WW.MxGateway.Server.Security.Authentication;
@@ -20,8 +19,7 @@ public sealed class GalaxyRepositoryGrpcService(
     GalaxyDb.IGalaxyRepository repository,
     GalaxyDb.IGalaxyHierarchyCache cache,
     GalaxyDb.IGalaxyDeployNotifier notifier,
-    IGatewayRequestIdentityAccessor identityAccessor,
-    ILogger<GalaxyRepositoryGrpcService> logger) : ProtoGalaxyRepository.GalaxyRepositoryBase
+    IGatewayRequestIdentityAccessor identityAccessor) : ProtoGalaxyRepository.GalaxyRepositoryBase
 {
     private static readonly TimeSpan FirstLoadWaitBudget = TimeSpan.FromSeconds(5);
     private const int DefaultDiscoverPageSize = 1000;
@@ -347,15 +345,4 @@ public sealed class GalaxyRepositoryGrpcService(
 
     private sealed record PageToken(long Sequence, string FilterSignature, int Offset);
 
-    [System.Diagnostics.CodeAnalysis.SuppressMessage(
-        "Style",
-        "IDE0051:Remove unused private members",
-        Justification = "Kept for parity with prior SQL exception mapping; future direct-SQL paths reuse it.")]
-    private RpcException MapSqlException(SqlException exception)
-    {
-        logger.LogWarning(exception, "Galaxy repository query failed.");
-        return new RpcException(new Status(
-            StatusCode.Unavailable,
-            "Galaxy repository is unavailable."));
-    }
 }