Store datasheets for the parts actually placed in the current design,
grouped under hardware/re-bba-rb/datasheets/ by sheet (fpga, power,
usb, ethernet). Filenames normalised to the part MPN. All tracked
through git-lfs per .gitattributes (*.pdf).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
