export.unmarked
You pointed export at a README that has never carried the generated block, so there is nothing between markers for it to replace.
What it means
Section titled “What it means”The target carries no roadkeep markers, so nothing there is governed yet.
One command closes it, and it is derived rather than composed.
What closes it
Section titled “What closes it”roadkeep export --readme— the target carries no roadkeep markers, so nothing there is governed yet