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/BrowseCommandTests.cs

@@ -9,6 +9,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 public class BrowseCommandTests
 {
     /// <summary>Verifies that Execute prints browse results correctly.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_PrintsBrowseResults()
     {
@@ -37,6 +38,7 @@ public class BrowseCommandTests
     }
 
     /// <summary>Verifies that Execute browses from the specified node ID.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_BrowsesFromSpecifiedNode()
     {
@@ -60,6 +62,7 @@ public class BrowseCommandTests
     }
 
     /// <summary>Verifies that Execute browses from null node when not specified.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_DefaultBrowsesFromNull()
     {
@@ -81,6 +84,7 @@ public class BrowseCommandTests
     }
 
     /// <summary>Verifies that Execute browses only a single level when not recursive.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_NonRecursive_BrowsesSingleLevel()
     {
@@ -106,6 +110,7 @@ public class BrowseCommandTests
     }
 
     /// <summary>Verifies that Execute browses child nodes when recursive flag is set.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_Recursive_BrowsesChildren()
     {
@@ -129,6 +134,7 @@ public class BrowseCommandTests
     }
 
     /// <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()
     {