fix(claude_agent_sdk): serialize thinking blocks with type#213

Abhijeet Prasad (AbhiPrasad) merged 1 commit intomainbraintrustdata/braintrust-sdk-python:mainfrom

abhi-fix-149-thinking-block-typebraintrustdata/braintrust-sdk-python:abhi-fix-149-thinking-block-typeCopy head branch name to clipboard