Generate tests from metadata

A test whose Metadata property names a query definition is a template: CAT runs that query when the project opens and produces one test per returned row, replacing %COLUMN% in every property with the row's value. The template itself is not run. Every fact is on the documentation page it links; the same page as markdown is at the URL with index.md appended, which is the form to read when your fetch tool summarizes HTML.

The shape