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/ReadCommandTests.cs

@@ -8,6 +8,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 
 public class ReadCommandTests
 {
+    /// <summary>Verifies that execute prints the read value.</summary>
     [Fact]
     public async Task Execute_PrintsReadValue()
     {
@@ -39,6 +40,7 @@ public class ReadCommandTests
         output.ShouldContain("Server Time:");
     }
 
+    /// <summary>Verifies that execute calls read value with correct node ID.</summary>
     [Fact]
     public async Task Execute_CallsReadValueWithCorrectNodeId()
     {
@@ -57,6 +59,7 @@ public class ReadCommandTests
         fakeService.ReadNodeIds[0].Identifier.ShouldBe("MyVariable");
     }
 
+    /// <summary>Verifies that execute disconnects in finally.</summary>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {
@@ -75,6 +78,7 @@ public class ReadCommandTests
         fakeService.DisposeCalled.ShouldBeTrue();
     }
 
+    /// <summary>Verifies that execute disconnects even on read error.</summary>
     [Fact]
     public async Task Execute_DisconnectsEvenOnReadError()
     {