Three scalability-focused authoring guides for content production across 300+ systems: - base-text-authoring-guide.md: elevation checklist, quality test - culture-authoring-guide.md: 8-step workflow, modifier contract, cross-cultural contrast test, one-day-per-culture target - content-structure-canonical.md: directory template, surviving structure audit, culture RON field reference Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>