Worked on foundational improvements to the gismo/gismo library, focusing on streamlining geometry mapping workflows through enhanced template organization. Introduced forward declarations for the nv function template and the onormal_expr class template, clarifying interfaces and enabling more effective compiler optimizations for expression handling. The work emphasized C++ development and template programming, laying the groundwork for future performance tuning and maintainability within the codebase. No major user-facing features were released during this period, as the primary goal was to improve code structure and prepare the repository for subsequent refactors and optimizations in geometry mapping and related computational workflows.