Load the MHD turbulence velocity field time series "mhd-turbulence_pathsurface/data/mhd-turbulence_pathsurface_{timestep}.vti", where "timestep" in {0000, 0010, 0020, 0030, 0040} (5 timesteps, VTI format, 128x128x128 grid each). 
Visualize the temporal evolution by generating stream surfaces (ribbons) from each timestep with varying opacity. 
Use a line seed along the z-axis at x=64, y=64 (from z=40 to z=88) with 20 seed points. 
Trace streamlines bidirectionally with maximum length 150. Create ribbon surfaces from the streamlines with width 0.8. 
Apply progressive opacity (0.3 for t=0, increasing to 0.9 for t=40) to show temporal layering. Color all surfaces by velocity magnitude using the 'Viridis (matplotlib)' colormap. 
Add a color bar labeled 'Velocity Magnitude'. Use a dark gray background (RGB: 0.08, 0.08, 0.1). Set an isometric camera view. Render at 1024x1024.
Save the paraview state as "mhd-turbulence_pathsurface/results/{agent_mode}/mhd-turbulence_pathsurface.pvsm".
Save the visualization image as "mhd-turbulence_pathsurface/results/{agent_mode}/mhd-turbulence_pathsurface.png".
(Optional, if use python script) Save the python script as "mhd-turbulence_pathsurface/results/{agent_mode}/mhd-turbulence_pathsurface.py".
Do not save any other files, and always save the visualization image.