Changes for Opus 4.6 and Adaptive Thinking.

[Stevoman]

Hi, I added new enums and objects to support Opus 4.6 and adaptive thinking.

The ThinkingParameters, OutputFormat, and new OutputConfig objects needed a bit of delicate handling to avoid breaking changes. I think I got it all right but this is my first contribution so sorry if I missed anything.

[Stevoman]

Botched the unit tests build, let's try that again...

[rschili]

SDK consumer here. I'm waiting for this.

[abdofallah]

@tghamm is the repo still being maintained?

[tghamm]

@abdofallah Yes. But like most oss, I do not get paid to do this, so make a best effort to fit this into my schedule.

I hope to get to it today or tomorrow.

[Stevoman]

I went ahead and added Sonnet 4.6 (released yesterday) as well since it supports adaptive thinking.

[tghamm]

@Stevoman thank you for the contribution - nice work! @abdofallah would like to get a couple of small things in, coming today/tomorrow.

[abdofallah]

@abdofallah Yes. But like most oss, I do not get paid to do this, so make a best effort to fit this into my schedule.

I hope to get to it today or tomorrow.

yup completely understandable, if you are looking for maintainers we will contribute as much as possible since we utilize the library in our production apps.

Thanks for the update!