OS utilities catalog opens

A cluster of Windows and desktop utilities that had lived on a personal GitHub account now share a public catalog. The first wave includes an activity-map launcher, SVG thumbnail handlers, an Explorer thumbcache command, a dark-mode scheduler, a Nikon webcam bridge, and a desktop assistant.

The split is practical. Interaction-design experiments stay at HCI Nerdz. Shells and CLIs stay at OpenShellOrg. Developer-machine tooling stays at Dev-Centr. Desktop Tooling is the remaining bucket: things that sit on the OS desktop.

The public site and docs hub publish on GitHub Pages. There is no custom domain in this bootstrap.