geosim/QAD — reverse-engineered prompt

Build me a QGIS 2 plugin called QAD, short for Quantum Aided Design. I want it to make QGIS feel more like a simple CAD program, with a command line style workflow and map tools for drawing and editing vector features.

Users should be able to draw lines, polylines, arcs, circles, rectangles, polygons, text, dimensions, and buffers. They should also be able to edit geometry with common CAD commands like move, copy, rotate, scale, mirror, trim, extend, offset, fillet, break, stretch, erase, join, divide, measure, and undo or redo. Include snapping, grip editing, layer helpers, command aliases, settings dialogs, icons, help text, and translation support if practical.

Please make it work as a normal installable QGIS 2 Python plugin with a toolbar, menus, dialogs, and sample data. Keep the interface practical and familiar for people who know basic CAD commands. Look up old QGIS 2 plugin docs online if needed.