Implement `Shader` API Object

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@tychedelia is already working on this.

Since Feb 17, 2026.

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Description

When users interact with our material API, they'll need to load WGSL shaders from the filesystem. We'll want to implement a Shader asset that helps them doing so. Note, in Processing4 PShader is a more general purpose entry-point to OpenGL. Because WebGPU is a bit lower-level than GL, it doesn't make as much sense to expose a full pipeline API here. We may in the future choose to add some things like reflection driven layout information for users who want to use the low-level WebGPU APIs, but let's keep it simple to start as just a handle to a shader file.

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Rust
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