feat(v5-M1): TrimmedSurface integration + SSI boolean + topology healing + tolerance system
M1.1 — TrimmedSurface 深度集成 (Agent #0):
- trimmed_surface.h: winding number, closest_boundary_point, to_mesh() with CDT
- factory methods: from_rect_with_hole, from_cylinder_patch, from_sphere_patch
- brep.h: TopoFace +trimmed_surface_id, add_trimmed_surface()
- brep.cpp: to_mesh() prefers TrimmedSurface path
- modeling.cpp: make_box uses TrimmedSurface, added make_sphere_patch()
- 23 tests, compilation passes
M1.2 — SSI 基布尔运算 (Agent #1):
- ssi_boolean.h/.cpp: full SSI pipeline (Step1-4)
- Step1: parallel face-face SSI, Step2: face splitting via TrimmedSurface
- Step3: ray-cast classification + exact predicates, Step4: face sewing
- GMP exact predicates integrated (16 references to exact_orient3d/in_sphere)
- OpenMP parallel (4 #pragma omp sections)
- 33 tests, syntax-check passes
M1.3 — 拓扑修复 + 容差系统 (Agent #2):
- brep_heal.h/.cpp: heal_gaps (BFS), heal_slivers (Newell area), heal_orientation (Euler)
- heal_topology: one-shot pipeline, heal_step_import: STEP auto-heal
- tolerance.h: PerFaceTolerance, sliver_area, auto_tolerance(), face_tolerance()
- brep_validate.cpp: all hardcoded 1e-6/1e-9 → ToleranceConfig
- Tests: tolerance 34/34, heal 24/24, validate 16/16 (all passing)
- Fixed: face_area_approx Newell formula bug, heal_step_import reporting
19 files, ~3200 lines net new code, 90+ new tests
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