feat(v10): tolerant modeling + Class-A deep + hex mesh + constraint solver + drawing standards
v10.1 — Tolerant Modeling (对标 Parasolid):
- tolerant_modeling.h/.cpp: TolerantVertex/Edge, merge_within_tolerance (BFS)
- gap_bridging (free edge detection → triangle filling)
- overlap_resolution (normal+centroid+AABB detection)
- tolerant_boolean (heal→degenerate detect→boolean→heal) + BooleanDiagnostic
- import_heal_pipeline (STEP one-shot repair)
- ssi_boolean enhanced: coplanar/collinear/tangent detection, GMP on all classify paths
- step_import enhanced: broken file recovery, non-standard entity mapping, diagnostic report
- 30 tests, 4112 total lines
v10.2 — Class-A Deep + Hex Mesh (对标 CGM + ANSYS):
- class_a_surfacing enhanced: g3_blend_with_constraints, surface_energy_minimization
- curvature_continuity_optimization, reflection_line_discontinuity (+720 lines)
- fea_mesh enhanced: mapped_hex, submapped_hex, multi_block_hex (TFI), hex_quality_optimization (+522 lines)
- 22 tests
v10.3 — Constraint Solver + Drawing Standards (对标 D-Cubed + AutoCAD):
- constraint_solver enhanced: DOFAnalyzer, RedundancyDetector, ConstraintPropagator, KinematicChainSolver
- drawing_standards.h/.cpp: IsoStandard (ISO 128/129), AnsiStandard (ASME Y14.5), JisStandard (JIS B 0001)
- 12 tests
12 files, ~5000 lines, 64 tests. Target: 87% → 93%
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