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/RealMxGatewayClient.cs

@@ -301,7 +301,10 @@ public sealed class RealMxGatewayClient : IMxGatewayClient
         }
     }
 
-    /// <inheritdoc />
+    /// <summary>
+    /// Asynchronously disposes the active MxAccess session, client, and galaxy resources.
+    /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     public async ValueTask DisposeAsync()
     {
         if (_session is not null) await _session.DisposeAsync().ConfigureAwait(false);