docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.SiteCallAudit/SiteCallAuditActor.cs

@@ -156,18 +156,7 @@ public class SiteCallAuditActor : ReceiveActor
         Receive<DiscardSiteCallRequest>(HandleDiscardSiteCall);
     }
 
-    /// <summary>
-    /// SiteCallAudit-001: child supervision strategy — governs children, not this
-    /// actor. The actor has no children today, so this override is inert; it
-    /// returns a one-for-one strategy with the framework
-    /// <see cref="Akka.Actor.SupervisorStrategy.DefaultDecider"/> (Restart on
-    /// most exceptions; Stop on <see cref="ActorInitializationException"/> /
-    /// <see cref="ActorKilledException"/>) and <c>maxNrOfRetries: 0</c>, so any
-    /// future child that throws is Stopped on the first failure. The actor's
-    /// own resilience comes from the <c>try/catch</c> in <see cref="OnUpsertAsync"/>
-    /// plus the parent <see cref="Akka.Cluster.Tools.Singleton.ClusterSingletonManager"/>'s
-    /// supervision — not from this override.
-    /// </summary>
+    /// <inheritdoc />
     protected override SupervisorStrategy SupervisorStrategy()
     {
         return new OneForOneStrategy(maxNrOfRetries: 0, withinTimeRange: TimeSpan.Zero, decider: