.Net: Enable argument types retention in handoff orchestration. (#13367)

This PR fixes the issue when an MCP function is called with an argument
that doesn't match the expected parameter type.

From chat:
```csharp
public async Task<string> GetDataAsync(

    [Description("Optional modality type filter (CT, MRI, XA, etc.). Make sure it is a LIST of strings. Examples: ['CT'] or ['CT', 'MR']")] List<string>? modalityType = null, 

(...............)
```

When we tested it using Semantic Kernel without MCP, it returned the
data in the correct format. However, when we integrated it into the tool
(one API Server where we initialize the Kernel and another MCP Server
with all the functions), we get the incorrect format:
<img width="1186" height="175" alt="image"
src="https://github.com/user-attachments/assets/9efd26e2-77fc-4ec2-85ed-60a35fa9e821"
/>

Author: SergeyMenshykh

dotnet/src/Agents/Orchestration/Handoff/HandoffActor.cs

@@ -71,7 +71,13 @@ protected override AgentInvokeOptions CreateInvokeOptions(Func<ChatMessageConten
             new()
             {
                 Kernel = kernel,
-                KernelArguments = new(new PromptExecutionSettings { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() }),
+                KernelArguments = new(new PromptExecutionSettings
+                {
+                    FunctionChoiceBehavior = FunctionChoiceBehavior.Auto(options: new()
+                    {
+                        RetainArgumentTypes = true,
+                    })
+                }),
                 OnIntermediateMessage = messageHandler,
             };
 

dotnet/src/VectorData/SqliteVec/SqliteMapper.cs

@@ -56,7 +56,7 @@ public TRecord MapFromStorageToDataModel(DbDataReader reader, bool includeVector
                 }
 
                 var floats = new float[length / 4];
-                var bytes = MemoryMarshal.Cast<float, byte>(floats);
+                var bytes = MemoryMarshal.Cast<float, byte>(floats.AsSpan());
                 stream.ReadExactly(bytes);
 #else
                 var floats = MemoryMarshal.Cast<byte, float>((byte[])reader[ordinal]).ToArray();