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

@@ -9,6 +9,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 public class RedundancyCommandTests
 {
     /// <summary>Verifies that Execute prints redundancy information correctly.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_PrintsRedundancyInfo()
     {
@@ -36,6 +37,7 @@ public class RedundancyCommandTests
     }
 
     /// <summary>Verifies that Execute omits the Server URIs section when none are present.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_NoServerUris_OmitsUriSection()
     {
@@ -61,6 +63,7 @@ public class RedundancyCommandTests
     }
 
     /// <summary>Verifies that Execute calls GetRedundancyInfo on the service.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_CallsGetRedundancyInfo()
     {
@@ -78,6 +81,7 @@ public class RedundancyCommandTests
     }
 
     /// <summary>Verifies that Execute disconnects and disposes in the finally block.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {