code works but vscode extension shows error, possibly app.cl.jac can't identify that the walker is defined in app.jac <img width="789" height="466" alt="Image" src="https://github.com/user-attachments/assets/5f19c990-6838-4b71-95c9-0eddc78a7377" /> <img width="614" height="376" alt="Image" src="https://github.com/user-attachments/assets/1f6b5d7b-ba9f-4309-8c3e-c63739287bc5" />