expand-site-language

Add a NEW language to an EXISTING site across ALL its content, and translate the pages later without blocking. Use when the owner says "add Armenian / Spanish / French to the whole site", "make the site multilingual", "translate the whole site into X", "scale this to more languages", "add a new language to all pages/sections", or "add a locale". This is the ONLY correct way to add a language to existing content. Do NOT use compose-frozen-template, manage-content-collections, or owner_template_update_group for this — they cannot add a per-page locale to existing pages and will refuse or break the site. Two tools: owner_content_add_site_language (fan the language out, seeded with the default language so the site is valid instantly, no translation API) and owner_content_translate_pending (the non-blocking runner — you translate the strings later). Self- sufficient: no Hermes, no other agent.