- Return std::expected from RimSurfaceCollection::importSurfacesFromFiles
with a message naming the files that could not be imported
- Return specific errors from ImportSurface and NewSurface scripting
methods instead of nullptr
- Import before deleting the surface to overwrite, so a failed overwrite
keeps the existing surface
- Catch surfio exceptions in RifSurfio to avoid a crash on corrupt files
- Include the method name in the generic "no result" gRPC error
- Add Python tests for import_surface error handling