New MCP tool `export_drill` wrapping `kicad-cli pcb export drill`: format (excellon/gerber), drill origin, Excellon zero-suppression and oval formats, units, mirror-Y, minimal header, separate PTH/NPTH files, drill map generation + map format, and Gerber precision. Self-contained interface handler reading the saved .kicad_pcb. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>