Got it. So far my research prototype really just does filled paths and limited strokes, but the architecture should extend to a richer set of graphics primitive

Got it. So far my research prototype really just does filled paths and limited strokes, but the architecture should extend to a richer set of graphics primitives. Pathfinder also started out that way but recent work is building out a good chunk of the SVG imaging model. I definitely recommend checking it out, there's a good chance it'll do what you need.