feat(v12): generative surfaces (Sweep/Loft/Net) + curve tools + surface analysis
M1 — Generative Surfaces:
- sweep_surface: Explicit/Spine/TwoGuides modes
- loft_surface: multi-section interpolation + guide + tangent constraints
- net_surface: bidirectional curve grid → NURBS
M3 — Curve Tools + Analysis:
- curve_tools: project_curve, parallel_curve, connect_curve(G1-G3), helix, isoparametric
- surface_analysis: inflection_lines, checker_mapping, surface_checker_report (A/B/C/D)
- 14/14 tests passed
Fixed: constraint_solver.h duplicate declaration, fea_mesh.h comment syntax
Pending: M2 surface editing (retrying)
茂之钳
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