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.Shared.Tests/Fakes/FakeApplicationConfigurationFactory.cs

@@ -6,10 +6,16 @@ namespace ZB.MOM.WW.OtOpcUa.Client.Shared.Tests.Fakes;
 
 internal sealed class FakeApplicationConfigurationFactory : IApplicationConfigurationFactory
 {
+    /// <summary>Gets or sets a value indicating whether to throw when Create is called.</summary>
     public bool ThrowOnCreate { get; set; }
+
+    /// <summary>Gets the number of times CreateAsync has been called.</summary>
     public int CreateCallCount { get; private set; }
+
+    /// <summary>Gets the last connection settings passed to CreateAsync.</summary>
     public ConnectionSettings? LastSettings { get; private set; }
 
+    /// <inheritdoc />
     public Task<ApplicationConfiguration> CreateAsync(ConnectionSettings settings, CancellationToken ct)
     {
         CreateCallCount++;