Iteration pipeline

[Shfty]

• Visualization via bevy requires textual preprocessing to handle bind groups, builtins, etc.
• Practical approach is probably to generate a WGSL / GLSL function, then feed that into a bevy Shader
• Perhaps use shadertoy? Likely easier than rigging up the corresponding bevy machinery.
• Eventually, create a small winit + wgpu viewer that renders to a full-screen quad

[Shfty]

Done: Implemented via postprocessing in elysian-shadertoy module