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.Transport/Import/BundleSessionEvictionService.cs

@@ -21,6 +21,11 @@ internal sealed class BundleSessionEvictionService : BackgroundService
     private readonly IBundleSessionStore _sessionStore;
     private readonly ILogger<BundleSessionEvictionService> _logger;
 
+    /// <summary>
+    /// Initializes a new instance of <see cref="BundleSessionEvictionService"/>.
+    /// </summary>
+    /// <param name="sessionStore">The bundle session store to sweep for expired sessions.</param>
+    /// <param name="logger">Logger for sweep diagnostics.</param>
     public BundleSessionEvictionService(
         IBundleSessionStore sessionStore,
         ILogger<BundleSessionEvictionService> logger)
@@ -29,6 +34,7 @@ internal sealed class BundleSessionEvictionService : BackgroundService
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
     }
 
+    /// <inheritdoc />
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
         while (!stoppingToken.IsCancellationRequested)