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/MxAccess/IMxAccessAlarmConsumer.cs

@@ -101,6 +101,7 @@ public interface IMxAccessAlarmConsumer : IDisposable
     ///     ConditionRefresh path — operator clients call this after reconnect
     ///     to seed local Part 9 state.
     /// </summary>
+    /// <returns>The most recently parsed snapshot of currently active alarms.</returns>
     IReadOnlyList<MxAlarmSnapshotRecord> SnapshotActiveAlarms();
 
     /// <summary>