Wikipedia seems close enough to what you're describing ... and improving Wikipedia (plenty of science pages are flagged as "this is hard to understand for non-specialists) seems like the easiest way to move it closer.
The wikipedia contains millions of topics, so the subset of "settled science" is lost among them. Creating a "Settled Science" portal could be an approximation.
As an example of where my idea differs from the wikipedia approach: the wikipedia Science portal displays a link to article about Albert Einstein. Yes, Albert Einstein was an important scientist, but his personal biography is not science. So one difference would be that the "settled science encyclopedia" would not include Einstein or any other scientist (except among th...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.