docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

src/ZB.MOM.WW.MxGateway.Server/Dashboard/Hubs/DashboardEventBroadcaster.cs

@@ -14,9 +14,7 @@ public sealed class DashboardEventBroadcaster(
     IHubContext<EventsHub> hubContext,
     ILogger<DashboardEventBroadcaster> logger) : IDashboardEventBroadcaster
 {
-    /// <summary>Publishes an MX event to connected dashboard clients.</summary>
-    /// <param name="sessionId">The session identifier.</param>
-    /// <param name="mxEvent">The MX event to publish.</param>
+    /// <inheritdoc />
     public void Publish(string sessionId, MxEvent mxEvent)
     {
         if (string.IsNullOrEmpty(sessionId) || mxEvent is null)

src/ZB.MOM.WW.MxGateway.Server/Dashboard/Hubs/DashboardSnapshotPublisher.cs

@@ -9,7 +9,7 @@ namespace ZB.MOM.WW.MxGateway.Server.Dashboard.Hubs;
 /// gateway process; clients listen via the hub.
 /// </summary>
 /// <remarks>
-/// Server-042: <see cref="ExecuteAsync"/> wraps the snapshot subscription in
+/// <see cref="ExecuteAsync"/> wraps the snapshot subscription in
 /// a reconnect loop with a configurable retry delay (5s by default,
 /// mirroring <see cref="AlarmsHubPublisher"/>). A transient failure inside
 /// <see cref="IDashboardSnapshotService.WatchSnapshotsAsync"/> — e.g. a

src/ZB.MOM.WW.MxGateway.Server/Dashboard/Hubs/EventsHub.cs

@@ -27,7 +27,7 @@ public sealed class EventsHub : Hub
     /// client.
     /// </summary>
     /// <remarks>
-    /// Server-038: in v1 the hub-level <see cref="AuthorizeAttribute"/>
+    /// In v1 the hub-level <see cref="AuthorizeAttribute"/>
     /// (<c>HubClientsPolicy</c>) only checks that the caller carries one of
     /// the dashboard roles (Admin or Viewer); both roles may subscribe to
     /// any session id they choose. This is acceptable today because (a) the
@@ -43,6 +43,7 @@ public sealed class EventsHub : Hub
     /// dedicated authorization policy applied to the hub method itself.
     /// </remarks>
     /// <param name="sessionId">Session id to subscribe the caller to.</param>
+    /// <returns>A task representing the subscription operation.</returns>
     public Task SubscribeSession(string sessionId)
     {
         if (string.IsNullOrWhiteSpace(sessionId))