feat(v7): B-Rep deep attack + Class-A surfacing + CAM deep + performance tuning
v7.1 — B-Rep 深度攻坚 (对标 Parasolid 95%):
- advanced_healing: auto_heal_pipeline, face_splitting/merging, topology_optimization
- watertight_verification, tolerance_analysis, tolerance diagnostic report
- sheet_metal: unfold_sheet_metal (K-Factor/BFS), bend_deduction_table, create_flange
- direct_modeling enhanced: draft_face_advanced (hinge), scale_body (non-uniform), mirror_body
- 32 tests (17 healing + 15 sheet metal), syntax-check passed
v7.2 — Class-A 曲面攻坚 (对标 CGM 95%):
- class_a_surfacing: g3_blend (4-row CP), curvature_matching (Levenberg-Marquardt)
- highlight_lines, reflection_lines, iso_photes, surface_diagnosis, shape_modification
- advanced_intersection: robust_ssi (3-stage: AABB+subdivision→Newton 1e-12→singularity)
- curve_surface_intersection, self_intersection_detection (BVH)
- 30 tests (18 class-A + 12 intersection), zero compile errors
v7.3 — CAM 深化 + 性能优化:
- cam_advanced: adaptive_clearing, trochoidal_milling, rest_machining, pencil_tracing
- tool_holder_collision_check, toolpath_optimization, feed_rate_optimization
- performance_tuning: parallel_task_graph (DAG+Kahn), work_stealing_scheduler
- memory_pool_integration, cache_optimization_hints, profile_guided_layout
- Fixed BrepModel API compatibility (body.bounds()/to_mesh() instead of .faces())
- 20 tests
12 files, ~5200 lines, 82 tests
茂之钳
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