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/GatewayEndToEndReconnectReplayTests.cs

@@ -19,7 +19,7 @@ namespace ZB.MOM.WW.MxGateway.Tests.Gateway;
 
 /// <summary>
 ///     End-to-end reconnect/replay tests through the real gRPC <c>StreamEvents</c> path via the
-///     fake worker harness (TST-01, server half). A single subscriber detaches (cancel + await
+///     fake worker harness (server half). A single subscriber detaches (cancel + await
 ///     the stream task so its lease is fully disposed), the session is retained by detach-grace
 ///     while the distributor pump keeps appending worker events to the replay ring, and a second
 ///     stream reconnects with <see cref="StreamEventsRequest.AfterWorkerSequence"/>. Covers both
@@ -233,7 +233,7 @@ public sealed class GatewayEndToEndReconnectReplayTests
     }
 
     /// <summary>
-    ///     GWC-25 regression, end to end: when age eviction has emptied the replay ring, the
+    ///     Regression, end to end: when age eviction has emptied the replay ring, the
     ///     <c>ReplayGap</c> sentinel carries the next deliverable sequence (highest observed + 1),
     ///     so a client applying the documented
     ///     <c>after_worker_sequence = oldest_available_sequence - 1</c> formula on its follow-up
@@ -305,7 +305,7 @@ public sealed class GatewayEndToEndReconnectReplayTests
         Assert.NotNull(sentinel.ReplayGap);
         Assert.Equal(staleCursor, sentinel.ReplayGap.RequestedAfterSequence);
 
-        // The whole point of GWC-25: the sentinel anchors the resume at the next sequence that
+        // The whole point of the fix: the sentinel anchors the resume at the next sequence that
         // can still be delivered, not at 0.
         Assert.Equal(highestSeen + 1, sentinel.ReplayGap.OldestAvailableSequence);