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/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverReadTests.cs

@@ -43,6 +43,7 @@ public sealed class GalaxyDriverReadTests
     }
 
     /// <summary>Verifies that ReadAsync routes through the injected reader.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task ReadAsync_RoutesThroughInjectedReader()
     {
@@ -58,6 +59,7 @@ public sealed class GalaxyDriverReadTests
     }
 
     /// <summary>Verifies that ReadAsync returns empty without calling the reader for an empty request.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task ReadAsync_EmptyRequest_ReturnsEmpty_WithoutCallingReader()
     {
@@ -71,6 +73,7 @@ public sealed class GalaxyDriverReadTests
     }
 
     /// <summary>Verifies that ReadAsync throws when seams and production runtime are not built.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task ReadAsync_NoSeams_AndNoProductionRuntime_Throws()
     {
@@ -86,6 +89,7 @@ public sealed class GalaxyDriverReadTests
     }
 
     /// <summary>Verifies that ReadAsync throws after the driver is disposed.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task ReadAsync_AfterDispose_Throws()
     {
@@ -96,6 +100,7 @@ public sealed class GalaxyDriverReadTests
     }
 
     /// <summary>Verifies that ReadAsync resolves from the first OnDataChange event on the subscribe-once path.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task ReadAsync_SubscribeOncePath_ResolvesFromFirstOnDataChange()
     {
@@ -120,6 +125,7 @@ public sealed class GalaxyDriverReadTests
     }
 
     /// <summary>Verifies that ReadAsync surfaces rejected tags as bad status on the subscribe-once path.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task ReadAsync_SubscribeOncePath_RejectedTagSurfacesAsBadStatus()
     {
@@ -140,6 +146,7 @@ public sealed class GalaxyDriverReadTests
     }
 
     /// <summary>Verifies that ReadAsync preserves reader status codes.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task ReadAsync_PreservesReaderStatusCodes()
     {