fix(dspy): align span shape with spec, drop over-serialization, avoid nested llm spans#588

Abhijeet Prasad (AbhiPrasad) merged 2 commits into

mainbraintrustdata/braintrust-sdk-python:mainfrom

dspy-spec-alignmentbraintrustdata/braintrust-sdk-python:dspy-spec-alignmentCopy head branch name to clipboard