feat(vis-core): WebGPU Renderer: Binding Graphs, Pipeline state, and Vertex Layouts

[Jarbuckle]

feat(vis-core): WebGPU Renderer: Binding Graphs, Pipeline state, and Vertex Layouts

What

Introduces the declarative half of the generalized WebGPU renderer: BindingGraph for assigning resource slots to @group/@binding positions, the traversal that resolves a shader's slots against a graph, normalized pipeline state, content-addressed pipeline fingerprints for cache keys, and vertexLayout for grouping attributes into GPUVertexBufferLayouts.

Also adds the standalone RenderTarget descriptor.

renderer/index.ts is a partial barrel; pipeline compilation, drawables, scenes, and the encoder follow in the next PR.

Stacked on the resources PR.

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