ViewDesignEngine
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feat: v0.6.0 精度提升 — Shewchuk Level C + 分层容差 + 业内方案调研
精确谓词: Shewchuk Level B → Level C (expansion arithmetic)
- Dekker split + Two-Product + Two-Sum + Expansion 4-component
- orient_2d/3d 自适应精度，支持大坐标(>1e14)
- in_circle 扩展精度
容差系统: 单级 → 分层
- Tolerance::tighten/relax 继承
- Tolerance::min 合并取更严格
- ToleranceScope 作用域临时容差
- 预设容差级别: Modeling/Fitting/Intersection/Snapping
文档: 新增 06-精度提升方案调研 (252行)
- 6种主流精度方案对比
- Parasolid/ACIS/OCCT/CGAL 商业内核解密
- VDE v0.6-v2.0 精度提升路线图
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