Update README with Git LFS fetch instructions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -15,7 +15,17 @@ viewer: false
 
 Dataset for the paper: *Stream2LLM: Overlap Context Streaming and Prefill for Reduced Time-to-First-Token* (MLSys 2026 artifact evaluation). Contains workload traces, experiment run logs, and performance model measurements used to produce all figures, tables, and inline numbers in the paper.
 
-This repository is a git submodule of the main [Stream2LLM artifact](https://github.com/rajveerb/stream2llm/tree/mlsys_artifact) (branch: `mlsys_artifact`). Clone the parent repo with `--recurse-submodules` to automatically fetch this data.
+This repository is a git submodule of the main [Stream2LLM artifact](https://github.com/rajveerb/stream2llm/tree/mlsys_artifact) (branch: `mlsys_artifact`). Data files are stored with Git LFS on HuggingFace. To fetch everything:
+
+```bash
+# Option 1: Clone parent repo with submodules, then pull LFS files
+git clone --recurse-submodules -b mlsys_artifact https://github.com/rajveerb/stream2llm.git
+cd stream2llm/data && git lfs install && git lfs pull && cd ../..
+
+# Option 2: If you already cloned without submodules
+git submodule update --init
+cd data && git lfs install && git lfs pull && cd ..
+```
 
 ## Directory Structure