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.Galaxy.Tests/Health/HostConnectivityForwarderTests.cs

@@ -14,6 +14,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests.Health;
 /// </summary>
 public sealed class HostConnectivityForwarderTests
 {
+    /// <summary>Verifies that SetTransport pushes the state change under the client name.</summary>
     [Fact]
     public void SetTransport_Running_PushesUnderClientName()
     {
@@ -30,6 +31,7 @@ public sealed class HostConnectivityForwarderTests
         agg.Snapshot()[0].HostName.ShouldBe("OtOpcUa-A");
     }
 
+    /// <summary>Verifies that SetTransport fires a change event on state transitions.</summary>
     [Fact]
     public void SetTransport_StateTransition_FiresChange()
     {
@@ -47,6 +49,7 @@ public sealed class HostConnectivityForwarderTests
         captured[0].NewState.ShouldBe(HostState.Stopped);
     }
 
+    /// <summary>Verifies that repeated identical state changes do not fire events.</summary>
     [Fact]
     public void SetTransport_RepeatedSameState_DoesNotFire()
     {
@@ -64,6 +67,7 @@ public sealed class HostConnectivityForwarderTests
         captured.ShouldBeEmpty();
     }
 
+    /// <summary>Verifies that the constructor rejects empty client names.</summary>
     [Fact]
     public void Constructor_RejectsEmptyClientName()
     {
@@ -72,6 +76,7 @@ public sealed class HostConnectivityForwarderTests
         Should.Throw<ArgumentException>(() => new HostConnectivityForwarder("   ", agg));
     }
 
+    /// <summary>Verifies that SetTransport throws after the forwarder is disposed.</summary>
     [Fact]
     public void SetTransport_AfterDispose_Throws()
     {