--gerbers <pcb> [outdir]: one .gbr per enabled layer (stackup plot order,
kicad-cli defaults via default JOB_EXPORT_PCB_GERBERS + PlotJobToPlotOpts)
plus the .gbrjob file — mirrors JobExportGerbers minus the zone re-check.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ADzCSeN3Q9DJL3YW2FZTXB