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.OpcUaClient.Tests/OpcUaClientHistoryTests.cs

@@ -8,6 +8,8 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;
 [Trait("Category", "Unit")]
 public sealed class OpcUaClientHistoryTests
 {
+    /// <summary>Verifies MapAggregateToNodeId returns standard Part 13 aggregate for every enum.</summary>
+    /// <param name="agg">The history aggregate type to test.</param>
     [Theory]
     [InlineData(HistoryAggregateType.Average)]
     [InlineData(HistoryAggregateType.Minimum)]
@@ -22,6 +24,7 @@ public sealed class OpcUaClientHistoryTests
         nodeId.NamespaceIndex.ShouldBe((ushort)0);
     }
 
+    /// <summary>Verifies MapAggregateToNodeId rejects invalid enum values.</summary>
     [Fact]
     public void MapAggregateToNodeId_rejects_invalid_enum_value()
     {
@@ -30,6 +33,7 @@ public sealed class OpcUaClientHistoryTests
             OpcUaClientDriver.MapAggregateToNodeId((HistoryAggregateType)99));
     }
 
+    /// <summary>Verifies ReadRawAsync throws without initialization.</summary>
     [Fact]
     public async Task ReadRawAsync_without_initialize_throws_InvalidOperationException()
     {
@@ -40,6 +44,7 @@ public sealed class OpcUaClientHistoryTests
                 TestContext.Current.CancellationToken));
     }
 
+    /// <summary>Verifies ReadRawAsync with malformed NodeId returns empty result.</summary>
     [Fact]
     public async Task ReadRawAsync_with_malformed_NodeId_returns_empty_result_not_throw()
     {
@@ -52,6 +57,7 @@ public sealed class OpcUaClientHistoryTests
         await Task.CompletedTask;
     }
 
+    /// <summary>Verifies ReadProcessedAsync throws without initialization.</summary>
     [Fact]
     public async Task ReadProcessedAsync_without_initialize_throws_InvalidOperationException()
     {
@@ -63,6 +69,7 @@ public sealed class OpcUaClientHistoryTests
                 TestContext.Current.CancellationToken));
     }
 
+    /// <summary>Verifies ReadAtTimeAsync throws without initialization.</summary>
     [Fact]
     public async Task ReadAtTimeAsync_without_initialize_throws_InvalidOperationException()
     {
@@ -73,6 +80,7 @@ public sealed class OpcUaClientHistoryTests
                 TestContext.Current.CancellationToken));
     }
 
+    /// <summary>Verifies ReadEventsAsync throws NotSupportedException as documented.</summary>
     [Fact]
     public async Task ReadEventsAsync_throws_NotSupportedException_as_documented()
     {