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/FakeSessionFactory.cs

@@ -8,8 +8,11 @@ internal sealed class FakeSessionFactory : ISessionFactory
     private readonly List<FakeSessionAdapter> _createdSessions = [];
     private readonly Queue<FakeSessionAdapter> _sessions = new();
 
+    /// <summary>Gets the number of times CreateSessionAsync has been called.</summary>
     public int CreateCallCount { get; private set; }
+    /// <summary>Gets or sets a value indicating whether CreateSessionAsync should throw.</summary>
     public bool ThrowOnCreate { get; set; }
+    /// <summary>Gets the endpoint URL from the last CreateSessionAsync call.</summary>
     public string? LastEndpointUrl { get; private set; }
 
     /// <summary>
@@ -18,8 +21,17 @@ internal sealed class FakeSessionFactory : ISessionFactory
     /// </summary>
     public TaskCompletionSource? CreateGate { get; set; }
 
+    /// <summary>Gets the list of sessions created via CreateSessionAsync.</summary>
     public IReadOnlyList<FakeSessionAdapter> CreatedSessions => _createdSessions;
 
+    /// <summary>Creates a session asynchronously (fake implementation).</summary>
+    /// <param name="config">The application configuration.</param>
+    /// <param name="endpoint">The endpoint description.</param>
+    /// <param name="sessionName">The session name.</param>
+    /// <param name="sessionTimeoutMs">The session timeout in milliseconds.</param>
+    /// <param name="identity">The user identity.</param>
+    /// <param name="ct">Cancellation token.</param>
+    /// <returns>A task containing the session adapter.</returns>
     public async Task<ISessionAdapter> CreateSessionAsync(
         ApplicationConfiguration config, EndpointDescription endpoint, string sessionName,
         uint sessionTimeoutMs, UserIdentity identity, CancellationToken ct)
@@ -54,6 +66,7 @@ internal sealed class FakeSessionFactory : ISessionFactory
     /// <summary>
     ///     Enqueues a session adapter to be returned on the next call to CreateSessionAsync.
     /// </summary>
+    /// <param name="session">The session adapter to enqueue.</param>
     public void EnqueueSession(FakeSessionAdapter session)
     {
         _sessions.Enqueue(session);