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/Dashboard/Hubs/EventsHub.cs

@@ -6,15 +6,9 @@ namespace ZB.MOM.WW.MxGateway.Server.Dashboard.Hubs;
 /// <summary>
 /// SignalR hub for per-session MxEvent push. Clients call
 /// <see cref="SubscribeSession"/> to join the group for a specific
-/// session; the dashboard's MxEvent broadcaster (a future hook on
-/// <c>EventStreamService</c>) sends messages to <c>session:{id}</c>.
+/// session; <see cref="DashboardEventBroadcaster"/> sends messages to
+/// <c>session:{id}</c> as events arrive from the live gRPC stream.
 /// </summary>
-/// <remarks>
-/// The publisher side is intentionally a follow-up. Today the dashboard's
-/// per-session event view is fed by the snapshot hub, which carries the
-/// rolling recent-events list. Once a dedicated MxEvent broadcaster
-/// lands, this hub's group convention is what it will publish to.
-/// </remarks>
 [Authorize(Policy = DashboardAuthenticationDefaults.HubClientsPolicy)]
 public sealed class EventsHub : Hub
 {