docs: complete XML doc comments via fixdocs (2757 to 131 findings)

Add missing <returns>/<param>/<summary>/<typeparam> tags and clean up
misused inheritdoc across 481 files so the documented API surface is
complete. Documentation-only (zero code lines changed). The 131 remaining
findings are inheritdoc-style warnings deliberately left to preserve
hand-written implementation rationale (plan-decision notes, race-condition
explanations).

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/ResilienceFormModelTests.cs

@@ -6,10 +6,12 @@ using ZB.MOM.WW.OtOpcUa.Core.Resilience;
 
 public class ResilienceFormModelTests
 {
+    /// <summary>Verifies that a blank form model serializes to null JSON.</summary>
     [Fact]
     public void Blank_form_serializes_to_null()
         => new ResilienceFormModel().ToJson().ShouldBeNull();
 
+    /// <summary>Verifies that a partial policy override round-trips correctly through JSON.</summary>
     [Fact]
     public void Partial_override_round_trips()
     {
@@ -26,6 +28,7 @@ public class ResilienceFormModelTests
         back.Policies["Write"].IsEmpty.ShouldBeTrue();
     }
 
+    /// <summary>Verifies that malformed JSON input yields an empty model with no-error handling.</summary>
     [Fact]
     public void Malformed_json_yields_empty_model()
     {
@@ -34,6 +37,7 @@ public class ResilienceFormModelTests
         m.Policies["Read"].IsEmpty.ShouldBeTrue();
     }
 
+    /// <summary>Verifies that JSON emitted by the form model can be parsed by the runtime resilience options parser.</summary>
     [Fact]
     public void Emitted_json_is_consumable_by_the_runtime_parser()
     {