Add Zenodo DOI to card

README.md

@@ -28,6 +28,7 @@ GPUs, Apple Silicon, and hosted APIs, under one reproducible workload suite (sui
 - **Live data and bulk downloads:** https://llm-speed.com/data
 - **Per-run permalink:** https://llm-speed.com/r/<id>
 - **Methodology:** https://llm-speed.com/methodology
+- **DOI:** https://doi.org/10.5281/zenodo.21254813 (Zenodo archive; resolves to the latest version)
 - **License:** CC BY 4.0. Reuse freely, including commercially, with attribution and a link back.
 
 ## What is in it
@@ -63,5 +64,5 @@ open each permalink to see the raw workload detail.
 
 ```
 llm-speed. The llm-speed dataset: signed LLM inference-speed benchmarks.
-https://llm-speed.com/data (2026). CC BY 4.0.
+Zenodo (2026). https://doi.org/10.5281/zenodo.21254813. CC BY 4.0.
 ```