docs: strip task-tracking IDs from code comments and fill missing XML docs

Tracking IDs are review bookkeeping that rots in shipped source; the rationale they tagged is kept. Comment-only change (CommentChecker 458 -> 16 false positives).

src/ZB.MOM.WW.MxGateway.Tests/Gateway/Dashboard/DashboardEventBroadcasterTests.cs

@@ -9,7 +9,7 @@ namespace ZB.MOM.WW.MxGateway.Tests.Gateway.Dashboard;
 
 /// <summary>
 /// Verifies that <see cref="DashboardEventBroadcaster"/> honours
-/// <c>MxGateway:Dashboard:ShowTagValues</c> (SEC-25): tag values are stripped
+/// <c>MxGateway:Dashboard:ShowTagValues</c>: tag values are stripped
 /// from the mirrored copy when the flag is off, present when it is on, and the
 /// shared source event is never mutated. Also verifies the viewer gate — the
 /// mirror does no work at all for a session nobody is watching.
@@ -325,22 +325,48 @@ public sealed class DashboardEventBroadcasterTests
         /// <summary>Gets the capturing client proxy shared by this fake.</summary>
         public CapturingClientProxy GroupProxy { get; } = new();
 
+        /// <summary>Gets the shared capturing proxy for all connections.</summary>
         public IClientProxy All => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy, ignoring exclusions.</summary>
+        /// <param name="excludedConnectionIds">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy AllExcept(IReadOnlyList<string> excludedConnectionIds) => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy for any connection.</summary>
+        /// <param name="connectionId">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy Client(string connectionId) => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy for any connection set.</summary>
+        /// <param name="connectionIds">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy Clients(IReadOnlyList<string> connectionIds) => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy for any group.</summary>
+        /// <param name="groupName">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy Group(string groupName) => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy for any group, ignoring exclusions.</summary>
+        /// <param name="groupName">Ignored.</param>
+        /// <param name="excludedConnectionIds">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy GroupExcept(string groupName, IReadOnlyList<string> excludedConnectionIds) => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy for any group set.</summary>
+        /// <param name="groupNames">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy Groups(IReadOnlyList<string> groupNames) => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy for any user.</summary>
+        /// <param name="userId">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy User(string userId) => GroupProxy;
 
+        /// <summary>Returns the shared capturing proxy for any user set.</summary>
+        /// <param name="userIds">Ignored.</param>
+        /// <returns>The shared capturing proxy.</returns>
         public IClientProxy Users(IReadOnlyList<string> userIds) => GroupProxy;
     }
 
@@ -367,9 +393,19 @@ public sealed class DashboardEventBroadcasterTests
 
     private sealed class NoopGroupManager : IGroupManager
     {
+        /// <summary>Ignores the group membership change.</summary>
+        /// <param name="connectionId">Ignored.</param>
+        /// <param name="groupName">Ignored.</param>
+        /// <param name="cancellationToken">Ignored.</param>
+        /// <returns>A completed task.</returns>
         public Task AddToGroupAsync(string connectionId, string groupName, CancellationToken cancellationToken = default)
             => Task.CompletedTask;
 
+        /// <summary>Ignores the group membership change.</summary>
+        /// <param name="connectionId">Ignored.</param>
+        /// <param name="groupName">Ignored.</param>
+        /// <param name="cancellationToken">Ignored.</param>
+        /// <returns>A completed task.</returns>
         public Task RemoveFromGroupAsync(string connectionId, string groupName, CancellationToken cancellationToken = default)
             => Task.CompletedTask;
     }