The Pen's Auto Add/Delete had its own copy of the anchor and segment hit
tests and of the path.insertAnchor / path.removeAnchor actions the Add
and Delete Anchor Point tools build. draw2 now exposes anchor_in /
segment_in (the hit tests over a given set of paths) and insert_anchor /
remove_anchor, which both tools use. Adds the ROADMAP entry.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>