feat: bind Solid definitions to Hex8 runtime elements

src/fesa/CMakeLists.txt

@@ -35,6 +35,8 @@ add_library(
     core/diagnostic.cpp
     core/status.cpp
     elements/element_factory.cpp
+    elements/hex8_element.cpp
+    elements/hex8_geometry.cpp
     elements/euler_beam_3d.cpp
     elements/finite_rotation.cpp
     elements/mitc4_shell.cpp