PublishAot is breaking the aspnetcore sample app

[chuckries]

Describe the bug
configuring the AspNetCoreSseServer sample for PublishAot causes default json serialization to not allow reflection which breaks the tool descriptor generation. This causes the app to thrown exception on launch

To Reproduce
Steps to reproduce the behavior:

1. Open sln
2. Set AspNetCoreSseServer sample project as startup project
3. Launch under debugger

Exception is thrown:
System.NotSupportedException: 'JsonTypeInfo metadata for type 'ModelContextProtocol.Server.IMcpServer' was not provided by TypeInfoResolver of type 'Microsoft.Extensions.AI.AIJsonUtilities+JsonContext'.

Expected behavior
Server launches

[stephentoub]

cc: @eiriktsarpalis, @agocke

[stephentoub]

ModelContextProtocol.Server.IMcpServer' was not provided by TypeInfoResolver of type

Something is wrong. Nothing should be trying to serialize one of these.

[chuckries]

I believe it stems from here

[halter73]

Isn't that the line that excludes it from the schema so it won't be deserialized?

[stephentoub]

The problem is

csharp-sdk/src/ModelContextProtocol/Server/TemporaryAIFunctionFactory.cs

Line 573 in 5e606c1

JsonTypeInfo typeInfo = serializerOptions.GetTypeInfo(parameterType);

That's being done too early. It needs to be moved down to L608.

[stephentoub]

@eiriktsarpalis already fixed that in the real AIFunctionFactory:
https://github.com/dotnet/extensions/blob/e0f0b6100f3f95b0847be14995e24cd644cd1d3a/src/Libraries/Microsoft.Extensions.AI/Functions/AIFunctionFactory.cs#L532
but we didn't make the change to TemporaryAIFunctionFactory, which will be deleted when we pick up the next M.E.AI.Abstractions package.

But we should still fix this in the meantime.