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/Client/ZB.MOM.WW.OtOpcUa.Client.CLI.Tests/HistoryReadCommandTests.cs

@@ -9,6 +9,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 
 public class HistoryReadCommandTests
 {
+    /// <summary>Verifies RawRead execution prints values.</summary>
     [Fact]
     public async Task Execute_RawRead_PrintsValues()
     {
@@ -42,6 +43,7 @@ public class HistoryReadCommandTests
         output.ShouldContain("2 values returned.");
     }
 
+    /// <summary>Verifies RawRead execution calls HistoryReadRaw.</summary>
     [Fact]
     public async Task Execute_RawRead_CallsHistoryReadRaw()
     {
@@ -62,6 +64,7 @@ public class HistoryReadCommandTests
         fakeService.HistoryReadRawCalls[0].NodeId.Identifier.ShouldBe("HistNode");
     }
 
+    /// <summary>Verifies AggregateRead execution calls HistoryReadAggregate.</summary>
     [Fact]
     public async Task Execute_AggregateRead_CallsHistoryReadAggregate()
     {
@@ -83,6 +86,7 @@ public class HistoryReadCommandTests
         fakeService.HistoryReadAggregateCalls[0].IntervalMs.ShouldBe(60000);
     }
 
+    /// <summary>Verifies AggregateRead execution prints aggregate info.</summary>
     [Fact]
     public async Task Execute_AggregateRead_PrintsAggregateInfo()
     {
@@ -104,6 +108,7 @@ public class HistoryReadCommandTests
         output.ShouldContain("7200000");
     }
 
+    /// <summary>Verifies invalid aggregate throws CommandException.</summary>
     [Fact]
     public async Task Execute_InvalidAggregate_ThrowsCommandException()
     {
@@ -123,6 +128,7 @@ public class HistoryReadCommandTests
             async () => await command.ExecuteAsync(console));
     }
 
+    /// <summary>Verifies disconnect is called in finally block.</summary>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {