docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests/TwinCATNativeNotificationTests.cs

@@ -22,6 +22,7 @@ public sealed class TwinCATNativeNotificationTests
         return (drv, factory);
     }
 
+    /// <summary>Verifies that native subscribe registers one notification per tag.</summary>
     [Fact]
     public async Task Native_subscribe_registers_one_notification_per_tag()
     {
@@ -37,6 +38,7 @@ public sealed class TwinCATNativeNotificationTests
         factory.Clients[0].Notifications.Select(n => n.SymbolPath).ShouldBe(["MAIN.A", "MAIN.B"], ignoreOrder: true);
     }
 
+    /// <summary>Verifies that native notification fires OnDataChange with pushed value.</summary>
     [Fact]
     public async Task Native_notification_fires_OnDataChange_with_pushed_value()
     {
@@ -57,6 +59,7 @@ public sealed class TwinCATNativeNotificationTests
         events.Last().FullReference.ShouldBe("Speed"); // driver-side reference, not ADS symbol
     }
 
+    /// <summary>Verifies that native unsubscribe disposes all notifications.</summary>
     [Fact]
     public async Task Native_unsubscribe_disposes_all_notifications()
     {
@@ -72,6 +75,7 @@ public sealed class TwinCATNativeNotificationTests
         factory.Clients[0].Notifications.ShouldBeEmpty();
     }
 
+    /// <summary>Verifies that native unsubscribe halts future notifications.</summary>
     [Fact]
     public async Task Native_unsubscribe_halts_future_notifications()
     {
@@ -94,6 +98,7 @@ public sealed class TwinCATNativeNotificationTests
         events.Count.ShouldBe(afterUnsub);
     }
 
+    /// <summary>Verifies that native subscribe failure mid-registration cleans up partial state.</summary>
     [Fact]
     public async Task Native_subscribe_failure_mid_registration_cleans_up_partial_state()
     {
@@ -128,13 +133,18 @@ public sealed class TwinCATNativeNotificationTests
     private sealed class FailAfterNAddsFake : FakeTwinCATClient
     {
         private readonly int _succeedBefore;
+        /// <summary>Gets the number of times AddNotificationAsync has been called.</summary>
         public int AddCallCount { get; private set; }
 
+        /// <summary>Initializes a new instance of FailAfterNAddsFake.</summary>
+        /// <param name="_">Unused parameter for alignment with parent constructor.</param>
+        /// <param name="succeedBefore">The number of calls to succeed before failing.</param>
         public FailAfterNAddsFake(AbTagParamsIrrelevant _, int succeedBefore) : base()
         {
             _succeedBefore = succeedBefore;
         }
 
+        /// <inheritdoc />
         public override Task<ITwinCATNotificationHandle> AddNotificationAsync(
             string symbolPath, TwinCATDataType type, int? bitIndex, TimeSpan cycleTime,
             int maxDelayMs, Action<string, object?> onChange, CancellationToken cancellationToken)
@@ -146,6 +156,7 @@ public sealed class TwinCATNativeNotificationTests
         }
     }
 
+    /// <summary>Verifies that native shutdown disposes subscriptions.</summary>
     [Fact]
     public async Task Native_shutdown_disposes_subscriptions()
     {
@@ -160,6 +171,7 @@ public sealed class TwinCATNativeNotificationTests
         factory.Clients[0].Notifications.ShouldBeEmpty();
     }
 
+    /// <summary>Verifies that the poll path still works when UseNativeNotifications is false.</summary>
     [Fact]
     public async Task Poll_path_still_works_when_UseNativeNotifications_false()
     {
@@ -187,6 +199,7 @@ public sealed class TwinCATNativeNotificationTests
         await drv.UnsubscribeAsync(handle, CancellationToken.None);
     }
 
+    /// <summary>Verifies that subscribe handle DiagnosticId indicates native vs poll.</summary>
     [Fact]
     public async Task Subscribe_handle_DiagnosticId_indicates_native_vs_poll()
     {