Sonnet 5's WC Architecture: Root URL as x-default, Language Subdirectories for Internationalization

The Wellbeing Compass Procrastination topic reveals a clean internationalization architecture: EN lives at the root (/procrastination.html) as the x-default hreflang, while DE and ES live in language subdirectories (/de/procrastination.html, /es/procrastination.html). Each page includes full hreflang alternates linking all siblings with proper locale codes (en, de, es_ES), canonical URLs, Open Graph metadata, and structured data. This pattern — root as default language, subdirectories for translations — follows Google's recommended i18n setup and scales cleanly to 10+ languages. The WC infrastructure is now proven across two topics (Perfectionism 10/10, Procrastination 3/10), making each new language deployment primarily a content+translation task rather than an infrastructure challenge.