Add provenance note for vLLM CI copy

README.md

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+<!-- vllm-ci-copy -->
+> [!NOTE]
+> This is a copy of [jeeejeee/chatglm3-text2sql-spider](https://huggingface.co/jeeejeee/chatglm3-text2sql-spider) at commit `40b6719`, made on 2026-10-30. vLLM CI uses this checkpoint and the original is on a personal account, so we keep a copy here to reduce supply-chain risk.
+