[Bug] run_code slice leaves a lone surrogate -> deepseek-official 400s every turn (0.2.0-rc.2; pi-ai routes already sanitize)

📝 摘要

run_code切片产生孤代理致官方接口每轮400

📄 正文节选

Duplicate-family note: this belongs to the family already reported in #1449 / #3315 / #8352 / #8466 / #8846 / #9010. I am adding an independent confirmation on desktop `0.2.0-rc.2` plus two data points I did not find above: (a) a producer path where the lone surrogate comes from model-authored `run_……

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