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.AbLegacy.Tests/AbLegacyDisposeAndResolveHostTests.cs

@@ -17,6 +17,7 @@ public sealed class AbLegacyDisposeAndResolveHostTests
 {
     // ---- Driver.AbLegacy-011 ----
 
+    /// <summary>Verifies that Dispose performs teardown without blocking on async operations.</summary>
     [Fact]
     public async Task Dispose_runs_teardown_without_blocking_on_async_wait()
     {
@@ -45,6 +46,7 @@ public sealed class AbLegacyDisposeAndResolveHostTests
         drv.GetHealth().State.ShouldBe(DriverState.Unknown);
     }
 
+    /// <summary>Verifies that Dispose can be called multiple times without throwing.</summary>
     [Fact]
     public async Task Dispose_is_idempotent()
     {
@@ -58,6 +60,7 @@ public sealed class AbLegacyDisposeAndResolveHostTests
         Should.NotThrow(() => drv.Dispose());
     }
 
+    /// <summary>Verifies that Dispose does not deadlock under a single-threaded synchronization context.</summary>
     [Fact]
     public async Task Dispose_under_single_threaded_sync_context_does_not_deadlock()
     {
@@ -100,9 +103,14 @@ public sealed class AbLegacyDisposeAndResolveHostTests
     {
         private readonly System.Collections.Concurrent.BlockingCollection<(SendOrPostCallback, object?)> _queue = new();
 
+        /// <inheritdoc />
         public override void Post(SendOrPostCallback d, object? state) => _queue.Add((d, state));
+
+        /// <inheritdoc />
         public override void Send(SendOrPostCallback d, object? state) => d(state);
 
+        /// <summary>Runs the event loop until the stop signal is set.</summary>
+        /// <param name="stop">The event to signal loop completion.</param>
         public void RunUntil(ManualResetEventSlim stop)
         {
             while (!stop.IsSet)
@@ -114,11 +122,13 @@ public sealed class AbLegacyDisposeAndResolveHostTests
             }
         }
 
+        /// <summary>Disposes the internal queue.</summary>
         public void Dispose() => _queue.Dispose();
     }
 
     // ---- Driver.AbLegacy-013 ----
 
+    /// <summary>Verifies that ResolveHost returns the configured device for a known tag reference.</summary>
     [Fact]
     public void ResolveHost_known_reference_returns_tag_device()
     {
@@ -130,6 +140,7 @@ public sealed class AbLegacyDisposeAndResolveHostTests
         drv.ResolveHost("X").ShouldBe("ab://10.0.0.5/1,0");
     }
 
+    /// <summary>Verifies that ResolveHost returns the first configured device when reference is unknown.</summary>
     [Fact]
     public void ResolveHost_unknown_reference_with_devices_returns_first_device()
     {
@@ -146,6 +157,7 @@ public sealed class AbLegacyDisposeAndResolveHostTests
         drv.ResolveHost("unknown").ShouldBe("ab://10.0.0.5/1,0");
     }
 
+    /// <summary>Verifies that ResolveHost returns the driver instance ID when no devices are configured.</summary>
     [Fact]
     public void ResolveHost_unknown_reference_no_devices_returns_driver_instance_id()
     {