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.FOCAS.Tests/FocasLoggingTests.cs

@@ -13,6 +13,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests;
 [Trait("Category", "Unit")]
 public sealed class FocasLoggingTests
 {
+    /// <summary>Verifies that the constructor accepts an ILogger.</summary>
     [Fact]
     public void Constructor_accepts_an_ILogger()
     {
@@ -29,6 +30,7 @@ public sealed class FocasLoggingTests
         drv.ShouldNotBeNull();
     }
 
+    /// <summary>Verifies that probe loop logs when an exception is swallowed.</summary>
     [Fact]
     public async Task ProbeLoop_logs_when_an_exception_is_swallowed()
     {
@@ -82,10 +84,23 @@ public sealed class FocasLoggingTests
 
     private sealed class CapturingLogger<T> : ILogger<T>
     {
+        /// <summary>Gets the captured log entries.</summary>
         public List<(LogLevel Level, string Message, Exception? Exception)> Entries { get; } = new();
 
+        /// <summary>Begins a logging scope.</summary>
+        /// <param name="state">The scope state.</param>
+        /// <typeparam name="TState">The type of the state.</typeparam>
         public IDisposable BeginScope<TState>(TState state) where TState : notnull => NullScope.Instance;
+        /// <summary>Checks if logging is enabled for the specified level.</summary>
+        /// <param name="logLevel">The log level.</param>
         public bool IsEnabled(LogLevel logLevel) => true;
+        /// <summary>Logs a message.</summary>
+        /// <param name="logLevel">The log level.</param>
+        /// <param name="eventId">The event ID.</param>
+        /// <param name="state">The state object.</param>
+        /// <param name="exception">The exception, if any.</param>
+        /// <param name="formatter">The formatter function.</param>
+        /// <typeparam name="TState">The type of the state.</typeparam>
         public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception? exception,
             Func<TState, Exception?, string> formatter)
         {
@@ -94,7 +109,9 @@ public sealed class FocasLoggingTests
 
         private sealed class NullScope : IDisposable
         {
+            /// <summary>Gets the singleton instance.</summary>
             public static NullScope Instance { get; } = new();
+            /// <summary>Disposes the scope.</summary>
             public void Dispose() { }
         }
     }