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.Tests/Gateway/Dashboard/HubTokenServiceTests.cs

@@ -7,7 +7,7 @@ namespace ZB.MOM.WW.MxGateway.Tests.Gateway.Dashboard;
 public sealed class HubTokenServiceTests
 {
     /// <summary>
-    /// Server-039: a token whose data-protected payload has both
+    /// A token whose data-protected payload has both
     /// <c>Name</c> and <c>NameIdentifier</c> null (the principal that
     /// minted the token had no identity claims) must be rejected by
     /// <see cref="HubTokenService.Validate"/>. The role claims alone are
@@ -38,7 +38,7 @@ public sealed class HubTokenServiceTests
     /// <summary>
     /// Sanity check: a token minted from a principal with a Name claim
     /// validates and returns a principal carrying that identity. Pins
-    /// that the Server-039 fix does not over-reject valid tokens.
+    /// that the null-identity rejection above does not over-reject valid tokens.
     /// </summary>
     [Fact]
     public void Validate_TokenWithName_ReturnsAuthenticatedPrincipal()