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/Client/ZB.MOM.WW.OtOpcUa.Client.CLI.Tests/RedundancyCommandTests.cs

@@ -8,6 +8,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 
 public class RedundancyCommandTests
 {
+    /// <summary>Verifies that Execute prints redundancy information correctly.</summary>
     [Fact]
     public async Task Execute_PrintsRedundancyInfo()
     {
@@ -34,6 +35,7 @@ public class RedundancyCommandTests
         output.ShouldContain("Application URI:  urn:app:myserver");
     }
 
+    /// <summary>Verifies that Execute omits the Server URIs section when none are present.</summary>
     [Fact]
     public async Task Execute_NoServerUris_OmitsUriSection()
     {
@@ -58,6 +60,7 @@ public class RedundancyCommandTests
         output.ShouldContain("Application URI:  urn:app:standalone");
     }
 
+    /// <summary>Verifies that Execute calls GetRedundancyInfo on the service.</summary>
     [Fact]
     public async Task Execute_CallsGetRedundancyInfo()
     {
@@ -74,6 +77,7 @@ public class RedundancyCommandTests
         fakeService.GetRedundancyInfoCalled.ShouldBeTrue();
     }
 
+    /// <summary>Verifies that Execute disconnects and disposes in the finally block.</summary>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {