New nodes: 'Voronoi Cells', 'Tesselate', and 'Relax Points'

[Keavon]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces Delaunay triangulation, Voronoi diagram generation, and Lloyd's relaxation nodes to the vector library, leveraging the delaunator crate. It also updates path-closing logic to prevent duplicate closing anchors for near-coincident endpoints. The review feedback highlights critical issues to address: correcting the perpendicular vector calculation in voronoi.rs to ensure unbounded cells project outward, clamping the relaxation iterations to prevent hangs from infinite or extremely large values, and enforcing a minimum threshold on the mesh weld tolerance to avoid division-by-zero errors on extremely small bounds.

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