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.OpcUaClient.Tests/OpcUaClientReadWriteTests.cs

@@ -12,6 +12,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;
 [Trait("Category", "Unit")]
 public sealed class OpcUaClientReadWriteTests
 {
+    /// <summary>Verifies that ReadAsync throws InvalidOperationException when not initialized.</summary>
     [Fact]
     public async Task ReadAsync_without_initialize_throws_InvalidOperationException()
     {
@@ -20,6 +21,7 @@ public sealed class OpcUaClientReadWriteTests
             await drv.ReadAsync(["ns=2;s=Demo"], TestContext.Current.CancellationToken));
     }
 
+    /// <summary>Verifies that WriteAsync throws InvalidOperationException when not initialized.</summary>
     [Fact]
     public async Task WriteAsync_without_initialize_throws_InvalidOperationException()
     {