Require meaningful monitoring HTML: sticky-bar/generated at top, footer
or taler-mon:bottom at end; ERROR if body is progress-only. Mid-run
(incomplete meta or progress without complete foot) relaxes bottom only.
GOA always checks taler-monitoring-surface. Generator emits taler-mon
markers and taler-mon-page complete|incomplete meta.
README section lists public HTML report paths; sticky "What this monitors"
adds a dedicated block that monpages/public pages are part of taler-monitoring.
