OptionallassoOptionalsnapSnap world-space points to the active grid (or any other snap target).
Registered as the snap dep, which insertAction applies to the
drag start and current point — so the live preview and the committed
geometry agree — and which the pen tool reads for its own anchor
placement. Covers every drag-to-insert tool (rect / ellipse / line /
polygon / star / text); freehand pencil samples are deliberately left
unsnapped.
Per-tool option overrides for the built-in shape/lasso tools. Each entry is a narrow subset of the underlying hook's options surface — just the knobs that need consumer control under the bundle pattern.