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/HistoryReadCommandTests.cs

@@ -10,6 +10,7 @@ namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
 public class HistoryReadCommandTests
 {
     /// <summary>Verifies RawRead execution prints values.</summary>
+    /// <returns>A task that represents the asynchronous test.</returns>
     [Fact]
     public async Task Execute_RawRead_PrintsValues()
     {
@@ -44,6 +45,7 @@ public class HistoryReadCommandTests
     }
 
     /// <summary>Verifies RawRead execution calls HistoryReadRaw.</summary>
+    /// <returns>A task that represents the asynchronous test.</returns>
     [Fact]
     public async Task Execute_RawRead_CallsHistoryReadRaw()
     {
@@ -65,6 +67,7 @@ public class HistoryReadCommandTests
     }
 
     /// <summary>Verifies AggregateRead execution calls HistoryReadAggregate.</summary>
+    /// <returns>A task that represents the asynchronous test.</returns>
     [Fact]
     public async Task Execute_AggregateRead_CallsHistoryReadAggregate()
     {
@@ -87,6 +90,7 @@ public class HistoryReadCommandTests
     }
 
     /// <summary>Verifies AggregateRead execution prints aggregate info.</summary>
+    /// <returns>A task that represents the asynchronous test.</returns>
     [Fact]
     public async Task Execute_AggregateRead_PrintsAggregateInfo()
     {
@@ -109,6 +113,7 @@ public class HistoryReadCommandTests
     }
 
     /// <summary>Verifies invalid aggregate throws CommandException.</summary>
+    /// <returns>A task that represents the asynchronous test.</returns>
     [Fact]
     public async Task Execute_InvalidAggregate_ThrowsCommandException()
     {
@@ -129,6 +134,7 @@ public class HistoryReadCommandTests
     }
 
     /// <summary>Verifies disconnect is called in finally block.</summary>
+    /// <returns>A task that represents the asynchronous test.</returns>
     [Fact]
     public async Task Execute_DisconnectsInFinally()
     {