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.DataConnectionLayer/Adapters/OpcUaDataConnection.cs

@@ -339,6 +339,7 @@ public class OpcUaDataConnection : IDataConnection, IBrowsableDataConnection, IA
     /// <summary>
     /// Asynchronously disposes the OPC UA connection, releasing the client and stopping the heartbeat monitor.
     /// </summary>
+    /// <returns>A <see cref="ValueTask"/> that completes when the client has been released and the heartbeat monitor stopped.</returns>
     public async ValueTask DisposeAsync()
     {
         StopHeartbeatMonitor();