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/DashboardGroupRoleMapper.cs

@@ -17,7 +17,10 @@ namespace ZB.MOM.WW.MxGateway.Server.Dashboard;
 public sealed class DashboardGroupRoleMapper(IOptions<GatewayOptions> options)
     : IGroupRoleMapper<string>
 {
-    /// <inheritdoc />
+    /// <summary>Maps the supplied dashboard LDAP group memberships to a dashboard role.</summary>
+    /// <param name="groups">The user's directory group memberships.</param>
+    /// <param name="ct">A token to request cancellation of the operation.</param>
+    /// <returns>The dashboard roles granted; scope is unused and always <see langword="null"/>.</returns>
     public Task<GroupRoleMapping<string>> MapAsync(
         IReadOnlyList<string> groups,
         CancellationToken ct)