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/Core/ZB.MOM.WW.OtOpcUa.Core.Tests/Observability/LogContextEnricherTests.cs

@@ -11,6 +11,7 @@ namespace ZB.MOM.WW.OtOpcUa.Core.Tests.Observability;
 [Trait("Category", "Unit")]
 public sealed class LogContextEnricherTests
 {
+    /// <summary>Verifies that the scope attaches all four log context properties.</summary>
     [Fact]
     public void Scope_Attaches_AllFour_Properties()
     {
@@ -32,6 +33,7 @@ public sealed class LogContextEnricherTests
         evt.Properties["CorrelationId"].ToString().ShouldBe("\"abc123\"");
     }
 
+    /// <summary>Verifies that scope disposal pops the log context properties.</summary>
     [Fact]
     public void Scope_Dispose_Pops_Properties()
     {
@@ -52,6 +54,7 @@ public sealed class LogContextEnricherTests
         captured.Events[1].Properties.ContainsKey("DriverInstanceId").ShouldBeFalse();
     }
 
+    /// <summary>Verifies that NewCorrelationId returns a 12-character hexadecimal string.</summary>
     [Fact]
     public void NewCorrelationId_Returns_12_Hex_Chars()
     {
@@ -60,6 +63,8 @@ public sealed class LogContextEnricherTests
         id.ShouldMatch("^[0-9a-f]{12}$");
     }
 
+    /// <summary>Verifies that Push throws when DriverInstanceId is missing or empty.</summary>
+    /// <param name="id">The driver instance ID value to test, or null.</param>
     [Theory]
     [InlineData(null)]
     [InlineData("")]
@@ -72,7 +77,10 @@ public sealed class LogContextEnricherTests
 
     private sealed class InMemorySink : ILogEventSink
     {
+        /// <summary>Gets the list of captured log events.</summary>
         public List<LogEvent> Events { get; } = [];
+        /// <summary>Emits a log event to the sink.</summary>
+        /// <param name="logEvent">The log event to emit.</param>
         public void Emit(LogEvent logEvent) => Events.Add(logEvent);
     }
 }