Internal PreparedContours.AutomaticEntryCandidates builds the uncapped
preferred start catalogue per contour from the contour's own winding:
convex corners, then straight-edge midpoints, then line/arc tangent
joints, deduplicated geometrically with the preparation epsilon (the
most preferred metadata wins at equal points). Reflex and cusp vertices,
collinear splits and circles are never enumerated for automatic placement;
hole slugs classify from their own travel. Manual Entry/ClosestEntry and
the legacy Entries API are unchanged; emission wiring comes in S09.
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