* Inquiry: SHAPES reports closed-shape geometry facts
`shapes` is a read-only command that reports, for every closed shape in the
current space (closed polylines, circles, full ellipses, closed splines),
its perimeter, area, centroid, winding, first self-intersection and
coincident vertices, exact with arcs and bulges. It filters and pages like
`entities` and counts other matches under `skipped` with the reason.
`Polyline::centroid` and `polygon_centroid` give the area centroid.
Fixes#1436.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* shapes: cap the quadratic self-intersection test at 4000 edges
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
