When deleting a hosted site, the associated Store is now soft-deleted (sets deleted_at). This frees the subdomain for reuse via the partial unique index (WHERE deleted_at IS NULL). Previously the Store was orphaned, blocking subdomain reuse. Closes docs/proposals/hosting-cascade-delete.md. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>