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.

src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/IDriverFactory.cs

@@ -14,6 +14,10 @@ public interface IDriverFactory
     ///     <c>null</c> when no factory is registered for that type (missing assembly, typo, etc.).
     ///     The DriverHostActor logs + skips the row rather than failing the whole apply.
     /// </summary>
+    /// <param name="driverType">The driver type name (e.g., "Modbus", "FOCAS").</param>
+    /// <param name="driverInstanceId">The driver instance identifier.</param>
+    /// <param name="driverConfigJson">The driver configuration as a JSON string.</param>
+    /// <returns>A new IDriver instance, or null if the driver type is not supported.</returns>
     IDriver? TryCreate(string driverType, string driverInstanceId, string driverConfigJson);
 
     /// <summary>Driver-type names this factory can materialise. Mostly for diagnostics + logs.</summary>
@@ -30,6 +34,12 @@ public sealed class NullDriverFactory : IDriverFactory
     public static readonly NullDriverFactory Instance = new();
     private NullDriverFactory() { }
 
+    /// <summary>Creates a driver (always returns null in this null implementation).</summary>
+    /// <param name="driverType">The driver type name.</param>
+    /// <param name="driverInstanceId">The driver instance identifier.</param>
+    /// <param name="driverConfigJson">The driver configuration as a JSON string.</param>
+    /// <returns>Always returns null.</returns>
     public IDriver? TryCreate(string driverType, string driverInstanceId, string driverConfigJson) => null;
+    /// <summary>Gets the collection of supported driver types (empty in this null implementation).</summary>
     public IReadOnlyCollection<string> SupportedTypes { get; } = Array.Empty<string>();
 }