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/WriteCommandTests.cs

@@ -8,6 +8,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 
 public class WriteCommandTests
 {
+    /// <summary>Verifies that write command executes successfully.</summary>
     [Fact]
     public async Task Execute_WritesSuccessfully()
     {
@@ -31,6 +32,7 @@ public class WriteCommandTests
         output.ShouldContain("Write successful: ns=2;s=MyVar = 100");
     }
 
+    /// <summary>Verifies that write command reports failure.</summary>
     [Fact]
     public async Task Execute_ReportsFailure()
     {
@@ -54,6 +56,7 @@ public class WriteCommandTests
         output.ShouldContain("Write failed:");
     }
 
+    /// <summary>Verifies that write command reads current value before writing.</summary>
     [Fact]
     public async Task Execute_ReadsCurrentValueThenWrites()
     {
@@ -79,6 +82,7 @@ public class WriteCommandTests
         fakeService.WriteValues[0].Value.ShouldBeOfType<double>();
     }
 
+    /// <summary>Verifies that write command disconnects in finally block.</summary>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {