McpServerToolCreateOptions miss MarshalResult option.

[truelife2]

Is your feature request related to a problem? Please describe.
i need MarshalResult for AIFunctionFactoryOptions, but the CreateAIFunctionFactoryOptions assign the MarshalResult=new ValueTask(result).
i without any solution to reset it, i just can to create a AIFunction,then use the AIFunction to create McpServerTool.

but i will loss many settings from DeriveOptions and CreateAIFunctionFactoryOptions(private methods).

Describe the solution you'd like
please add a MarhsalResult option in McpServerToolCreateOptions, then i can initialize the AIFunctionFactoryOptions.MarshalResult.

or add a Action< AIFunctionFactoryOptions > initailizeAIFunctionOptions, then call after CreateAIFunctionFactoryOptions, give me a chance to update the aifunction options.

        public new static AIFunctionMcpServerResource Create(MethodInfo method, object? target, McpServerResourceCreateOptions? options
            , Action<AIFunctionFactoryOptions> initializeAIFunctionFactoryOptions = null)
        {
            Throw.IfNull(method, "method");
            options = DeriveOptions(method, options);

            var aioptions = CreateAIFunctionFactoryOptions(method, options);
            initializeAIFunctionFactoryOptions?.Invoke(aioptions);

            return Create(AIFunctionFactory.Create(method, target, aioptions), options);
        }
        public new static AIFunctionMcpServerTool Create(MethodInfo method, object? target, McpServerToolCreateOptions? options
            , Action<AIFunctionFactoryOptions> initializeAIFunctionFactoryOptions = null)
        {
            Throw.IfNull(method, "method");
            options = DeriveOptions(method, options);

            var aioptions = CreateAIFunctionFactoryOptions(method, options);
            initializeAIFunctionFactoryOptions?.Invoke(aioptions);

            return Create(AIFunctionFactory.Create(method, target, aioptions), options);
        }`
        public new static AIFunctionMcpServerPrompt Create(MethodInfo method, object? target, McpServerPromptCreateOptions? options
            , Action<AIFunctionFactoryOptions> initializeAIFunctionFactoryOptions = null)
        {
            Throw.IfNull(method, "method");
            options = DeriveOptions(method, options);

            var aioptions = CreateAIFunctionFactoryOptions(method, options);
            initializeAIFunctionFactoryOptions?.Invoke(aioptions);

            return Create(AIFunctionFactory.Create(method, target, aioptions), options);
        }

Describe alternatives you've considered
currently , i just can use reflection to invoke DeriveOptions and CreateAIFunctionFactoryOptions,
but this was not stable in the future version. please add a standard MarshalResult options for my feature.

                    var createoptions = new McpServerToolCreateOptions()
                    {
                        Name = mcpname,
                        SerializerOptions = serializeroptions,
                    };
                    createoptions = (McpServerToolCreateOptions)DummyInstance.Value.Tool_DeriveOptions.Invoke(null, [mcpmethod, createoptions]);

                    var aifuncoptions = (AIFunctionFactoryOptions)DummyInstance.Value.Tool_CreateAIFunctionFactoryOptions.Invoke(null, [mcpmethod, createoptions]);
                    aifuncoptions.MarshalResult = OnToolMarshalResult;

                    var aifunc = AIFunctionFactory.Create(mcpmethod, instance, aifuncoptions);
                    var tool = McpServerTool.Create(aifunc, createoptions);
                    log.Info($"McpTool 已建立 - tool:{tool}。\r\n{mcpmethod}");

                    tools.Add(tool);

[andyst-dev]

I would like to work on this. I plan to add a focused MarshalResult delegate to McpServerToolCreateOptions, thread it into AIFunctionFactoryOptions, preserve it when deriving options, and add a regression test covering custom result marshaling. I will keep the change limited to tools as requested.