What the driver runs
build/score_all.py measures LibreOffice as the baseline, from out/lo_baseline. build/run_all.sh converts the fixture with soffice --headless --norestore --convert-to docx. LibreOffice is not one of the vendored editor trees. This note does not publish a new round-trip percentage for that output.
What it is
The baseline is a headless conversion through the installed LibreOffice binary. It is here so the editor lanes have a full word processor next to them.
Trivia
The binary the driver invokes is named soffice. That name is the StarOffice binary name, kept by OpenOffice and then by LibreOffice. The history of the name is not a score.