"Generate, validate, and fix KiCad 8/9 schematic files (.kicad_sch) programmatically. Use this skill whenever the user wants to create, modify, or fix KiCad schematics, generate netlists from circuit descriptions, fix ERC errors, or migrate schematics between KiCad versions. Triggers on: KiCad, schematic, .kicad_sch, ERC, electrical rules check, circuit design, PCB schematic, netlist generation, S-expression schematic, KiCad migration."