fix-paths-for-subpath-hosting

Make a static site's asset paths relative so it works wherever Simple Host serves it — the root of its own host, or the short-lived /<site>/ address a new owner's site may have at first. First detects the framework — for any framework with a base-path build setting (Vite, Next.js, CRA, SvelteKit, Astro, Nuxt, Angular, Gatsby, Vue CLI), routes back to the simple-host skill's framework-specific build instructions. Mechanically rewrites root-relative paths to relative paths only for genuinely raw HTML projects with no build system. Use before deploying a plain HTML site, when its assets 404, or when the deploy skill references this as a pre-deploy step.