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/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests/ScriptSandboxTests.cs

@@ -27,6 +27,7 @@ public sealed class ScriptSandboxTests
     }
 
     /// <summary>Verifies that a script can compile, run, and read a seeded tag.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Happy_path_script_runs_and_reads_seeded_tag()
     {
@@ -39,6 +40,7 @@ public sealed class ScriptSandboxTests
     }
 
     /// <summary>Verifies that SetVirtualTag records write operations.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task SetVirtualTag_records_the_write()
     {
@@ -316,6 +318,7 @@ public sealed class ScriptSandboxTests
     }
 
     /// <summary>Verifies that an allowed generic type argument still compiles.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Allowed_generic_type_argument_still_compiles()
     {
@@ -331,6 +334,7 @@ public sealed class ScriptSandboxTests
     }
 
     /// <summary>Verifies that typeof an allowed type still compiles.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Allowed_typeof_still_compiles()
     {
@@ -342,6 +346,7 @@ public sealed class ScriptSandboxTests
     }
 
     /// <summary>Verifies that script exceptions propagate unwrapped.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Script_exception_propagates_unwrapped()
     {
@@ -370,6 +375,7 @@ public sealed class ScriptSandboxTests
     }
 
     /// <summary>Verifies that LINQ Enumerable is available from scripts.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task Linq_Enumerable_is_available_from_scripts()
     {
@@ -385,6 +391,7 @@ public sealed class ScriptSandboxTests
     }
 
     /// <summary>Verifies that DataValueSnapshot is usable in scripts.</summary>
+    /// <returns>A task that represents the asynchronous test operation.</returns>
     [Fact]
     public async Task DataValueSnapshot_is_usable_in_scripts()
     {