Avoid double-counting OpenRouter callModel metrics#2005

Ronald Koh (ronaldkohhh) wants to merge 2 commits into

mainbraintrustdata/braintrust-sdk-javascript:mainfrom

fix-openrouter-callmodel-metric-double-countbraintrustdata/braintrust-sdk-javascript:fix-openrouter-callmodel-metric-double-countCopy head branch name to clipboard