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.CentralUI/Components/Audit/AuditResultsGrid.razor.cs

@@ -411,6 +411,7 @@ public partial class AuditResultsGrid : IAsyncDisposable
     /// </summary>
     /// <param name="columnKey">The stable key of the resized column.</param>
     /// <param name="widthPx">The new column width in pixels.</param>
+    /// <returns>A task that completes when the column width has been persisted and the component re-rendered.</returns>
     [JSInvokable]
     public async Task OnColumnResized(string columnKey, int widthPx)
     {
@@ -431,6 +432,7 @@ public partial class AuditResultsGrid : IAsyncDisposable
     /// </summary>
     /// <param name="fromKey">The stable key of the column being dragged.</param>
     /// <param name="toKey">The stable key of the target column drop slot.</param>
+    /// <returns>A task that completes when the column order has been persisted and the component re-rendered.</returns>
     [JSInvokable]
     public async Task OnColumnReordered(string fromKey, string toKey)
     {
@@ -472,6 +474,7 @@ public partial class AuditResultsGrid : IAsyncDisposable
     /// <summary>
     /// Releases the .NET object reference held for JS interop callbacks.
     /// </summary>
+    /// <returns>A completed value task.</returns>
     public ValueTask DisposeAsync()
     {
         _selfRef?.Dispose();