Groups and boolean operations made through the plugin API, and so through the AI and MCP group_nodes and boolean_* tools, take the box of what they contain instead of a default 100×100 box or the first operand's box. The box comes from getAxisAlignedBoundsInParent() in Scene Graph, measured in the parent's own axes so rotated or flipped parents work, and the editor's group, frame, auto-layout, and boolean commands share it so the UI and the API agree. Refs #738.
