Line numbering (`w:lnNumType`)

[loadfix]

Category

Styling and themes

Summary

display of margin line numbers (count by, restart, distance). Listed in CT_SectPr successors but no proxy.

Tracking

Part of the Microsoft Word feature-gap audit tracked in TODO.md.

[loadfix]

Resolved by commit 621eddc — Section.line_numbering (LineNumbering proxy with .count_by/.start/.distance/.restart), .set_line_numbering(...), .remove_line_numbering(). New WD_LINE_NUMBERING_RESTART enum. 31 new tests.