feat(v1.0.1): Parasolid + ACIS boolean robustness improvements

P0 — Boolean Robustness (Parasolid):
- 7-class degenerate taxonomy: surface_overlap, curve_overlap, high_order,
  boundary_contact, vertex_contact, non_manifold_contact
- Multi-point sampling: N=sqrt(area/tol²) points, >75% voting,
  exact_orient3d fallback on boundary cases
- PrecisionTracker: accumulated loss, threshold warning

P0 — Auto-Heal Pipeline (ACIS):
- 5-step pipeline: Stitch→Simplify→Regularize→Orient→Check
- AutoHealReport with per-step status, element counts, overall score

P1 — Direct Modeling (ACIS):
- fill_hole: edge loop → plane fit → NURBS insert
- pull_up_to_face: push_pull to target face alignment

Total: +~1500 lines across 6 files

include/vde/brep/brep_heal.h

@@ -85,6 +85,80 @@ int heal_orientation(BrepModel& body);
  */
 bool heal_topology(BrepModel& body, double tolerance = 1e-6);
 
+// ═══════════════════════════════════════════════════════════
+//  AutoHealReport — 五步流水线修复报告
+// ═══════════════════════════════════════════════════════════
+
+/**
+ * @brief 单步修复结果
+ */
+ struct StepResult {
+     bool success = false;       ///< 本步是否成功执行
+     std::string step_name;      ///< 步骤名称
+     int items_fixed = 0;        ///< 修复的元素数量
+     std::vector<std::string> warnings; ///< 本步产生的警告
+ };
+
+ /**
+  * @brief ACIS风格五步自动修复流水线报告
+  *
+  * 包含每一步的详细结果、总体评分和剩余警告。
+  */
+ struct AutoHealReport {
+     StepResult stitch;          ///< Step 1: 缝合
+     StepResult simplify;        ///< Step 2: 简化
+     StepResult regularize;      ///< Step 3: 正则化
+     StepResult orient;          ///< Step 4: 定向
+     StepResult check;           ///< Step 5: 验证
+
+     /** @brief 总体评分 (0-100)，基于每步成功率和修复量 */
+     int overall_score = 0;
+
+     /** @brief 剩余警告列表（跨步骤汇总） */
+     std::vector<std::string> warnings;
+
+     /** @brief 总修复元素数 */
+     [[nodiscard]] int total_fixed() const {
+         return stitch.items_fixed + simplify.items_fixed +
+                regularize.items_fixed + orient.items_fixed +
+                check.items_fixed;
+     }
+
+     /** @brief 成功步数 */
+     [[nodiscard]] int successful_steps() const {
+         return (stitch.success ? 1 : 0) +
+                (simplify.success ? 1 : 0) +
+                (regularize.success ? 1 : 0) +
+                (orient.success ? 1 : 0) +
+                (check.success ? 1 : 0);
+     }
+ };
+
+ /**
+  * @brief ACIS风格五步自动修复流水线
+  *
+  * 按顺序执行以下五个独立步骤，前一步失败不影响后一步：
+  *
+  * | 步骤 | 名称         | 操作                                                     |
+  * |------|-------------|----------------------------------------------------------|
+  * | 1    | Stitch      | 检测距离<tol的边→缝合（合并重合边）                        |
+  * | 2    | Simplify    | 移除退化边(长度<tol)+合并共线边+合并共面小面               |
+  * | 3    | Regularize  | 移除孤立顶点/边、修复翻转面、确保每边恰好属于2面           |
+  * | 4    | Orient      | 统一面法线向外指向                                       |
+  * | 5    | Check       | 欧拉-庞加莱公式验证+边面关联验证                          |
+  *
+  * @param body 待修复的 B-Rep 模型（原地修改）
+  * @param tolerance 缝合/简化容差，默认 1e-6
+  * @return AutoHealReport 包含每步详细结果、修复数量和总体评分
+  *
+  * @note 每一步捕获异常，失败后继续执行后续步骤。
+  *       最终评分 (0-100): 基础分=每步成功20分，警告扣分。
+  */
+ [[nodiscard]] AutoHealReport auto_heal_pipeline(
+     BrepModel& body, double tolerance = 1e-6);
+
+ // ── 旧版兼容 ──
+
 /**
  * @brief STEP 导入后自动修复
  *