* firstpcb.step regenerated from current PCB (DRC-clean board with
four M2 mounting holes). Two component 3D models (R_0805 and
JST_XH_B4B-XH-A) fail to decompress under the Nix-packaged KiCad;
affected components are missing 3D shapes but board body and other
models are present.
* pcbway_export/ contains gerbers (RS-274X Protel, 4.6 mm), separate
PTH/NPTH Excellon drill files, drill maps, gbrjob, and a README
with the stackup/spec.
* firstpcb_pcbway.zip is the upload-ready archive for PCBWay.
* .gitignore updated to drop KiCad autosaves and *.pre-drc-fix locals.
Constraint: PCBWay accepts gerbers with Protel extensions and Excellon
drills, separate PTH/NPTH preferred
Directive: regenerate this package whenever the PCB changes -- the zip
is a derived artifact; the source of truth is firstpcb.kicad_pcb
