test: Java-Konvergenz- + Homologie-Tests portiert — 173 CGAL-Tests

Mesh-Dateien aus Java-Referenzimplementierung übernommen:
  code/data/obj/cathead.obj    — offenes Mesh (Java: cathead.obj)
  code/data/obj/tetraflat.obj  — flaches Tetraeder (Java: tetraflat.obj)
  code/data/obj/brezel.obj     — Genus-1-Brezel (Java: brezel.obj)
  code/data/obj/brezel2.obj    — Genus-2-Brezel, V=2622 F=5248 χ=−2 (Java: brezel2.obj)
code/.gitignore: !data/**/*.obj — Mesh-Daten von *.obj-Regel ausgenommen.

Neue Tests in test_geometry_utils.cpp:

  HomologyGenerators.Genus2_FourCutEdges                    [vorher: GTEST_SKIP]
    Java: HomologyTest.testHomology — brezel2.obj, expects paths.size()==4
    C++:  compute_cut_graph(brezel2) → cut_edge_indices.size()==4, genus==2

  EuclideanLayout.DoLayout_TetraFlat_EdgeLengthsPreserved   [neu]
    Java: EuclideanLayoutTest.testDoLayout — tetraflat.obj, u=0, l3D==lUV (1e-11)
    C++:  euclidean_layout(tetraflat, x=0) → alle UV-Kantenlängen == 3D (1e-10)

  EuclideanLayout.CatHead_NewtonConverges_AngleSumsTwoPi    [neu]
    Java: EuclideanLayoutTest.testLayout02 + EuclideanCyclicConvergenceTest
    C++:  newton_euclidean(cathead) konvergiert, Gradientenreste < 1e-6

  SphericalLayout.SphericalTetrahedron_NewtonConverges_AngleSumsTwoPi [neu]
    Java: SphericalConvergenceTest.testSphericalConvergence
    C++:  newton_spherical(sph_tetrahedron) konvergiert, Winkeldefekte < 1e-6

CMakeLists.txt: CONFORMALLAB_DATA_DIR=${CMAKE_SOURCE_DIR}/data als Compile-Def.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

code/data/obj/cathead.obj

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code/data/obj/tetraflat.obj

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+# 
+# Wavefront OBJ file
+# Converted by the DEEP Exploration Deep Exploration 5 5.0.3.1555 Release
+# Right Hemisphere, LTD
+# http://www.righthemisphere.com/
+# 
+# object sgc 1
+g sgc_1
+v 0.00000 0.00000 0.00000
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+v 1.14390 0.47528 1.06408
+v 0.15103 -1.42803 -0.77755
+# 4 verticies
+f  1 2 3
+f  2 1 4
+f  1 3 4