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.Server/Grpc/MxAccessGrpcMapper.cs

@@ -35,7 +35,7 @@ public sealed class MxAccessGrpcMapper
     /// <summary>
     /// Maps a gRPC MX command to a worker command. Callers that already hold the command — including
     /// the constraint pipeline, whose rewritten command is not the one on the request — use this
-    /// overload rather than cloning a whole request to carry a single field (GWC-29); nothing outside
+    /// overload rather than cloning a whole request to carry a single field; nothing outside
     /// the command is read here.
     /// </summary>
     /// <param name="command">Command payload.</param>
@@ -71,7 +71,7 @@ public sealed class MxAccessGrpcMapper
             };
         }
 
-        // GWC-07 / IPC-05: ownership transfer, not a deep clone — the same rule MapEvent follows,
+        // ownership transfer, not a deep clone — the same rule MapEvent follows,
         // applied to the other (and larger, on bulk reads) hot-path message. The enclosing
         // WorkerCommandReply is parsed fresh from a single pipe frame in WorkerClient's read loop
         // and is single-consumer by construction: CompleteCommand's TryRemove hands it to exactly
@@ -93,10 +93,10 @@ public sealed class MxAccessGrpcMapper
     {
         ArgumentNullException.ThrowIfNull(workerEvent);
 
-        // GWC-07 / IPC-05: ownership transfer, not a deep clone. The enclosing WorkerEvent is
+        // ownership transfer, not a deep clone. The enclosing WorkerEvent is
         // parsed fresh from a single pipe frame in WorkerClient's read loop and is discarded
         // immediately after this mapping — the SessionEventDistributor pump is its single
-        // consumer (GWC-01 claims the worker event channel as single-reader), so nothing else
+        // consumer (it claims the worker event channel as single-reader), so nothing else
         // aliases or mutates workerEvent.Event. We therefore move the inner MxEvent into the
         // outbound graph instead of cloning it. Downstream the pump fans this one MxEvent to
         // every subscriber and retains it in the replay ring, but that sharing is READ-ONLY