Parse netlists into component graphs and render circuit diagrams via SchemDraw. Two layout strategies: loop layout for simple 2-terminal circuits (RC, RL, voltage divider) and labeled grid for complex circuits with active devices (BJT amplifiers, MOSFET). Backend: netlist parser, schematic engine, POST API endpoint. Frontend: SchematicViewer with zoom/download, stacked cell layout showing schematic + SPICE editor + waveform simultaneously.