Emission splits a contour at its entry with Arc/Line.SplitAt, which treat
a point within Tolerance.Epsilon (1e-5) of an endpoint as that endpoint
and start the contour there. The lead-in still ended at the entry point
itself, so an entry 1e-8..1e-5 from a vertex left that span uncut and the
plan's own verification refused it ("does not preserve complete directed
contours").
Imported PEP mounting holes hit this: two half circles whose stored centre
sits 5e-8 beside the chord's midpoint, so the closest entry to an approach
from straight below lands 5e-8 along the first arc from its start. Panel
doors were refused on every plate holding such a hole.
PreparedContours now snaps an entry 1e-8..1e-5 from its entity's start or
end to the exact vertex, for automatic entries, scrap pierce entries and
drawing pins alike, so the lead-in ends where the contour starts. Entries
already within 1e-8 are left as they were, so saved pinned programs
re-emit unchanged. Entries de-duplicate on the snapped point, and
near-corner insets keep the snap distance from both edge ends so none can
snap onto a reflex vertex.
aj
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