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.Galaxy.Tests/GalaxyDriverAlarmEventArgsExtensionTests.cs

@@ -14,6 +14,9 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests;
 /// </summary>
 public sealed class GalaxyDriverAlarmEventArgsExtensionTests
 {
+    /// <summary>
+    /// Verifies that acknowledge transition with full payload populates extended fields.
+    /// </summary>
     [Fact]
     public async Task Acknowledge_transition_with_full_payload_populates_extended_fields()
     {
@@ -47,6 +50,9 @@ public sealed class GalaxyDriverAlarmEventArgsExtensionTests
         observed[0].AlarmCategory.ShouldBe("Process");
     }
 
+    /// <summary>
+    /// Verifies that raise transition without optional fields leaves them null.
+    /// </summary>
     [Fact]
     public async Task Raise_transition_without_optional_fields_leaves_them_null()
     {
@@ -95,13 +101,26 @@ public sealed class GalaxyDriverAlarmEventArgsExtensionTests
     /// <summary>In-memory <see cref="IGalaxyAlarmFeed"/> the test drives directly.</summary>
     private sealed class FakeAlarmFeed : IGalaxyAlarmFeed
     {
+        /// <summary>
+        /// Occurs when an alarm transition is raised.
+        /// </summary>
         public event EventHandler<GalaxyAlarmTransition>? OnAlarmTransition;
 
+        /// <summary>
+        /// Starts the alarm feed.
+        /// </summary>
         public void Start() { }
 
+        /// <summary>
+        /// Emits an alarm transition to subscribers.
+        /// </summary>
+        /// <param name="transition">The alarm transition to emit.</param>
         public void Emit(GalaxyAlarmTransition transition)
             => OnAlarmTransition?.Invoke(this, transition);
 
+        /// <summary>
+        /// Disposes the alarm feed asynchronously.
+        /// </summary>
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 }