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.Worker/MxAccess/WorkerRuntimeHeartbeatSnapshot.cs

@@ -11,8 +11,7 @@ public sealed class WorkerRuntimeHeartbeatSnapshot
     /// <param name="lastEventSequence">Sequence number of the most recent event.</param>
     /// <param name="currentCommandCorrelationId">Correlation ID of the in-flight command.</param>
     /// <param name="staCallInProgress">
-    /// True while an STA call outside the command dispatcher is executing (currently the alarm poll,
-    /// WRK-27). The watchdog treats this like an in-flight command: it suppresses the stale-STA fault
+    /// True while an STA call outside the command dispatcher is executing (currently the alarm poll). The watchdog treats this like an in-flight command: it suppresses the stale-STA fault
     /// up to the stuck ceiling instead of the shorter grace, so a healthy-but-slow poll does not fault
     /// a healthy session. Named generically so any future non-dispatcher STA work reuses it.
     /// </param>
@@ -50,7 +49,7 @@ public sealed class WorkerRuntimeHeartbeatSnapshot
     /// <summary>
     /// Gets a value indicating whether an STA call outside the command dispatcher (the alarm poll) is
     /// executing. When true the watchdog grants the poll the same grace-to-ceiling suppression as a
-    /// dispatched command (WRK-27).
+    /// dispatched command.
     /// </summary>
     public bool StaCallInProgress { get; }
 }