Contains：我为家庭烘焙者做了一个过敏原检查工具，它宁可说「我不确定」也不瞎猜

Contains: I built an allergen checker for home bakers that says “I’m not sure” instead of guessing

A home baker's allergen checker built on a fine-tuned Qwen3.5-4B plus a rules layer achieves 86% recall with zero false alarms by adding an explicit "needs checking" verdict, after the fine-tune alone lost to its base model.