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/ReadCommandTests.cs

@@ -9,6 +9,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 public class ReadCommandTests
 {
     /// <summary>Verifies that execute prints the read value.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_PrintsReadValue()
     {
@@ -41,6 +42,7 @@ public class ReadCommandTests
     }
 
     /// <summary>Verifies that execute calls read value with correct node ID.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_CallsReadValueWithCorrectNodeId()
     {
@@ -60,6 +62,7 @@ public class ReadCommandTests
     }
 
     /// <summary>Verifies that execute disconnects in finally.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {
@@ -79,6 +82,7 @@ public class ReadCommandTests
     }
 
     /// <summary>Verifies that execute disconnects even on read error.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Execute_DisconnectsEvenOnReadError()
     {