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/AlarmsCommandTests.cs

@@ -8,6 +8,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 public class AlarmsCommandTests
 {
     /// <summary>Verifies that Execute subscribes to alarms.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Execute_SubscribesToAlarms()
     {
@@ -33,6 +34,7 @@ public class AlarmsCommandTests
     }
 
     /// <summary>Verifies that Execute with node passes source node ID.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Execute_WithNode_PassesSourceNodeId()
     {
@@ -58,6 +60,7 @@ public class AlarmsCommandTests
     }
 
     /// <summary>Verifies that Execute with refresh requests condition refresh.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Execute_WithRefresh_RequestsConditionRefresh()
     {
@@ -83,6 +86,7 @@ public class AlarmsCommandTests
     }
 
     /// <summary>Verifies that refresh failure prints error.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Execute_RefreshFailure_PrintsError()
     {
@@ -110,6 +114,7 @@ public class AlarmsCommandTests
     }
 
     /// <summary>Verifies that Execute unsubscribes on cancellation.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Execute_UnsubscribesOnCancellation()
     {
@@ -132,6 +137,7 @@ public class AlarmsCommandTests
     }
 
     /// <summary>Verifies that Execute disconnects in finally block.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {