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design: synthesizer + factory + CLI 三模块架构 plan: 9 个 Task(前置修复 + synthesizer 4 步 + factory + CLI generate/calibrate + re-export) calibrate: Fisher exact test 组合判定替代固定阈值 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>