test(qa): hold the Linux LibreOffice baseline to the lines #812 sets where the page does

[DemchaAV]

Why

#812 moved CobaltRota nearer the page in LibreOffice on Linux. The committed Linux baseline still holds the old numbers. While it does, the sheet could slip back that far and the gate would stay green.

What changed

• libreoffice-linux.tsv and libreoffice-linux-lines.tsv are the measurement CI took on fix(docx): cut a rule row's empty line to the room its row leaves it #812's last commit (run 36973332674), unedited.

  Document	Pages	Lines found	Past 2pt	Median	p90
  CobaltRota	1	151 of 154	122 → 0	2.34 → 0.55pt	3.04 → 1.24pt

• No other document's row or line changes.

Verification

• Not runnable locally. The Linux baseline is read only on Linux. The DOCX Fidelity (LibreOffice) job on this PR is the check: it measures the same tree against these files.

Lane: test (qa baselines).