fix(langchain): stop double-counting anthropic cache tokens in prompt totals#504

bhaveshklaviyo wants to merge 2 commits into

braintrustdata:mainbraintrustdata/braintrust-sdk-python:mainfrom

bhaveshklaviyo:fix/langchain-anthropic-cache-double-countbhaveshklaviyo/braintrust-sdk-python:fix/langchain-anthropic-cache-double-countCopy head branch name to clipboard