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/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/RoslynScriptedAlarmEvaluatorTests.cs

@@ -13,6 +13,7 @@ namespace ZB.MOM.WW.OtOpcUa.Host.IntegrationTests;
 /// </summary>
 public sealed class RoslynScriptedAlarmEvaluatorTests
 {
+    /// <summary>Verifies evaluation of predicate returning true reports Active.</summary>
     [Fact]
     public void Evaluate_predicate_returning_true_reports_Active()
     {
@@ -27,6 +28,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
         result.Active.ShouldBeTrue();
     }
 
+    /// <summary>Verifies evaluation of predicate returning false reports Inactive.</summary>
     [Fact]
     public void Evaluate_predicate_returning_false_reports_Inactive()
     {
@@ -41,6 +43,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
         result.Active.ShouldBeFalse();
     }
 
+    /// <summary>Verifies compiled predicates are cached across calls.</summary>
     [Fact]
     public void Evaluate_caches_compiled_predicate_across_calls()
     {
@@ -54,6 +57,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
         second.Active.ShouldBeFalse();
     }
 
+    /// <summary>Verifies compile errors return Failure.</summary>
     [Fact]
     public void Evaluate_compile_error_returns_Failure()
     {
@@ -65,6 +69,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
         result.Reason!.ShouldContain("compile");
     }
 
+    /// <summary>Verifies predicate writing virtual tag returns Failure.</summary>
     [Fact]
     public void Evaluate_predicate_writing_virtual_tag_returns_Failure()
     {
@@ -80,6 +85,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
         result.Reason!.ShouldContain("threw");
     }
 
+    /// <summary>Verifies empty predicate returns Failure.</summary>
     [Fact]
     public void Evaluate_empty_predicate_returns_Failure()
     {
@@ -88,6 +94,7 @@ public sealed class RoslynScriptedAlarmEvaluatorTests
         sut.Evaluate("alarm-empty", "", new Dictionary<string, object?>()).Success.ShouldBeFalse();
     }
 
+    /// <summary>Verifies evaluation after dispose returns Failure.</summary>
     [Fact]
     public void Evaluate_after_dispose_returns_Failure()
     {