New MCP tool `export_ipcd356` wrapping `kicad-cli pcb export ipcd356`:
generates an IPC-D-356 bare-board electrical-test netlist for flying-probe
and bed-of-nails testers. Minimal option set (outputPath + boardPath only,
matching the subcommand's --help). Self-contained interface handler reading
the saved .kicad_pcb.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>