.NET: [Bug]: Cannot set ReasoningEffort on gpt-5.6-luna

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Description

var azureOpenAIDeploymentName = builder.Configuration["AzureOpenAI:DeploymentName"];

builder.AddAzureOpenAIClient(connectionName: "openai")
       .AddChatClient(azureOpenAIDeploymentName); // model deployment name from Azure AI Foundry

return sp.GetRequiredService<IChatClient>().AsHarnessAgent(new HarnessAgentOptions
        {
            Name = name,
            HarnessInstructions = Instructions,
            ChatOptions = new ChatOptions { Tools = tools, Reasoning = new() { Effort = ReasoningEffort.Medium, Output = ReasoningOutput.Summary} },
            AIContextProviders = contextProviders,
            DisableWebSearch = true,
            OpenTelemetrySourceName = GenAiSourceNames.Agents,
        });

HTTP 400 (invalid_request_error: )

Parameter: reasoning_effort

Function tools with reasoning_effort are not supported for gpt-5.6-luna in /v1/chat/completions. To use function tools, use /v1/responses or set reasoning_effort to 'none'.

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