Fine inscribed flattening still let a native arc cut 6.2e-7 into a 1e-5
clamp unseen: less than one chord's sag, so the layout check, interactive
fill and Check Overlaps all called it clear. Tiny-clamp checks now
circumscribe perimeter arcs and inscribe cutout arcs (lines stay exact), so
the polygons hold every bit of real material. Any real overlap is reported;
the cost is a possible report within the tolerance of an arc, never a false
clear. The analyzer builds the same polygons instead of a second
OverlapMaterial read.
PM 407f5eb7-329f-41e4-947e-64ad52aa4034 (delta review s6-delta-review.md)
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