feat: enhance MTEB enrichment with cross-revision aggregation and manual fallbacks for latest models

feat: integrate MTEB benchmarks from official GitHub results repo

feat: track and save the source of each benchmark datapoint

feat: complete full set of Artificial Analysis metrics

feat: integrate Artificial Analysis API and correct Mistral family sizes

fix: implement robust fetching with retries and exponential backoff for benchmarks and providers

add bfl, etc

init