Drag documentation

Drag provides drag-and-drop behavior for TypeScript interfaces. The current development source includes sortable lists, a React adapter and grid gestures, alongside native element drag primitives and HTML custom elements.

The full documentation now lives at drag.0001.dev, in the same documentation layout as our other libraries.

The published alpha currently contains the native element adapter, HTML elements and utilities. Sortable, React and grid are development APIs; the installation guide explains their availability. Drag is MIT licensed, with upstream motion attribution in its NOTICE.