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/ConnectCommandTests.cs

@@ -8,6 +8,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 
 public class ConnectCommandTests
 {
+    /// <summary>Verifies that execute prints connection info.</summary>
     [Fact]
     public async Task Execute_PrintsConnectionInfo()
     {
@@ -38,6 +39,7 @@ public class ConnectCommandTests
         output.ShouldContain("Connection successful.");
     }
 
+    /// <summary>Verifies that execute calls connect and disconnect.</summary>
     [Fact]
     public async Task Execute_CallsConnectAndDisconnect()
     {
@@ -56,6 +58,7 @@ public class ConnectCommandTests
         fakeService.DisposeCalled.ShouldBeTrue();
     }
 
+    /// <summary>Verifies that execute disconnects on error.</summary>
     [Fact]
     public async Task Execute_DisconnectsOnError()
     {