Reasoning-prefix transfer: prefill Qwen3-8B's thinking with the first 1% of DeepSeek's reasoning and measure if its answer drifts toward the source via bge-m3 cosine. A local replication of the Stolen Thoughts demo (arXiv:2608.09867). 推理前缀迁移：把 DeepSeek 推理的前 1% 预填进 Qwen3-8B 的 thinking，用 bge-m3 余弦看答案是否向源靠拢。本地可跑，复刻 Stolen Thoughts 演示（arXiv:2608.09867）