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/Core/ZB.MOM.WW.OtOpcUa.Core.Tests/Resilience/PerCallHostResolverDispatchTests.cs

@@ -22,13 +22,13 @@ public sealed class PerCallHostResolverDispatchTests
         /// <param name="map">The mapping of full references to host names.</param>
         public StaticResolver(Dictionary<string, string> map) => _map = map;
 
-        /// <summary>Resolves a host name from the static mapping.</summary>
-        /// <param name="fullReference">The full reference to resolve.</param>
+        /// <inheritdoc />
         public string ResolveHost(string fullReference) =>
             _map.TryGetValue(fullReference, out var host) ? host : string.Empty;
     }
 
     /// <summary>Verifies that a dead PLC does not open the breaker for healthy PLCs when using a per-call resolver.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task DeadPlc_DoesNotOpenBreaker_For_HealthyPlc_With_Resolver()
     {
@@ -80,6 +80,7 @@ public sealed class PerCallHostResolverDispatchTests
     }
 
     /// <summary>Verifies that without a resolver, the same host shares one resilience pipeline.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task WithoutResolver_SameHost_Shares_One_Pipeline()
     {
@@ -98,6 +99,7 @@ public sealed class PerCallHostResolverDispatchTests
     }
 
     /// <summary>Verifies that with a resolver, different hosts get separate resilience pipelines.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task WithResolver_TwoHosts_Get_Two_Pipelines()
     {