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.Worker.Tests/MxAccess/MxAccessValueCacheTests.cs

@@ -115,6 +115,7 @@ public sealed class MxAccessValueCacheTests
     }
 
     /// <summary>Verifies that TryWaitForUpdate returns true when the cache is updated after the baseline.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task TryWaitForUpdate_ReturnsTrue_WhenSetFiresAfterBaselineVersion()
     {