Documents the data model (1 doc + document_translations table), service
layer changes, routing/editor UX, wiki-link resolution order, search,
and migration plan. Article URLs stay locale-independent; display falls
back to each document's default_locale when the requested locale lacks
a translation.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Yutaka Kurosaki