Eranbot (and the Copy Patrol tool) compares the text of a new edit to the search database. Earwig's copyvios tool also provides the ability to search for the entire text of the article, not just the recent edit. It may be useful to add a link to Earwig's tool.

The link should be in the first column, under the page title and history link. The link says "(compare whole page)".

Clicking on the link takes the user to:
https://tools.wmflabs.org/copyvios/?lang=en&project=wikipedia&title=ARTICLE+TITLE&oldid=&action=search&use_engine=1&use_links=1&turnitin=0
with the article title filled in automatically.

Note: This may be confusing -- we've already got multiple compare links, and the Turnitin report. Maybe we should hold off on this idea until we see how people use the new interface.