docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS/FocasAlarmProjection.cs

@@ -277,6 +277,6 @@ internal sealed class FocasAlarmProjection : IAsyncDisposable
 /// <summary>Handle returned by <see cref="FocasAlarmProjection.SubscribeAsync"/>.</summary>
 public sealed record FocasAlarmSubscriptionHandle(long Id) : IAlarmSubscriptionHandle
 {
-    /// <summary>Gets the diagnostic identifier for this subscription.</summary>
+    /// <inheritdoc />
     public string DiagnosticId => $"focas-alarm-sub-{Id}";
 }