Document Llama metadata-only dependency

base_models/llama-2-7b-hf/README.md

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+# Llama-2 7B Metadata
+
+This directory contains only the configuration and tokenizer metadata needed to instantiate the Llama-2 architecture and tokenize instructions for MemoryVLA inference.
+
+The full Llama-2 parameter weights are not mirrored here. The MemoryVLA task checkpoint contains the trained `llm_backbone` parameters; set `MEMORYVLA_SKIP_BASE_WEIGHTS=1` and point `MEMORYVLA_LLAMA2_7B_PATH` to this directory after downloading it.
+
+Use remains subject to the applicable Llama-2 license and access terms.