Alt during a drag unlinks the handle pair (only the outgoing one keeps following),
Alt-press on the last anchor's outgoing handle turns that handle alone, and pressing
the first anchor now closes on release, so a drag pulls out that anchor's handles
(a stand-in knot folded into the first one on commit). A plain click still closes
without touching the first anchor's handles. Still one History step per path.
Co-authored-by: Claude Opus 5.5 <[email protected]>
