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.Historian.Wonderware.Tests/ProgramAlarmWriterTests.cs

@@ -15,6 +15,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Host.Tests
     [Trait("Category", "Unit")]
     public sealed class ProgramAlarmWriterTests
     {
+        /// <summary>Verifies that BuildAlarmWriter returns a writer when the environment variable is unset.</summary>
         [Fact]
         public void BuildAlarmWriter_returns_writer_when_env_unset()
         {
@@ -26,6 +27,8 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Host.Tests
             writer.ShouldBeOfType<AahClientManagedAlarmEventWriter>();
         }
 
+        /// <summary>Verifies that BuildAlarmWriter returns a writer when the environment variable is explicitly true.</summary>
+        /// <param name="value">The truthy environment variable string value to test.</param>
         [Theory]
         [InlineData("true")]
         [InlineData("True")]
@@ -39,6 +42,8 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Host.Tests
             writer.ShouldNotBeNull();
         }
 
+        /// <summary>Verifies that BuildAlarmWriter returns null when the environment variable is false.</summary>
+        /// <param name="value">The falsy environment variable string value to test.</param>
         [Theory]
         [InlineData("false")]
         [InlineData("False")]
@@ -52,6 +57,7 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Host.Tests
             writer.ShouldBeNull();
         }
 
+        /// <summary>Verifies that BuildAlarmWriter treats unrecognized values as enabled.</summary>
         [Fact]
         public void BuildAlarmWriter_treats_unrecognized_value_as_enabled()
         {
@@ -72,10 +78,14 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Host.Tests
             return new DisposableAction(() => Environment.SetEnvironmentVariable(name, prior));
         }
 
+        /// <summary>Disposable wrapper for an action that executes on disposal.</summary>
         private sealed class DisposableAction : IDisposable
         {
             private readonly Action _action;
+            /// <summary>Initializes a new instance that will execute the given action on disposal.</summary>
+            /// <param name="action">The action to execute when disposed.</param>
             public DisposableAction(Action action) { _action = action; }
+            /// <summary>Executes the stored action.</summary>
             public void Dispose() => _action();
         }
     }