A collection is more than an index page
The site had accumulated useful material: unit dossiers, temples, calculator case studies, research articles, and project records. A reader needed more than a long page of links. The Study Library turned that material into named collections with their own hubs and clear paths from the main navigation.
Routes carry history
Changing a structure risks breaking the trail that brought readers there. Former converter, geometry, and structure addresses therefore kept permanent redirects as their destinations moved into the new route groups. A structural improvement is not permission to discard existing references.
Navigation is an editorial decision
The menu separates six working converters from the library of interpretation and documentation. Within the library, Case Studies, Temples, Units, Articles, and Blogs have distinct roles. That division makes the site’s fact-versus-interpretation discipline easier to follow in practice, not only on the standards page.
How it was checked
The release was checked for page count, internal links, navigation blocks, redirects, keyboard access, mobile behaviour, and console errors. The point was not to create a visually tidier menu; it was to make an expanding research collection traversable without losing its historical addresses.