Build a brand-new Luzmo chart component when no built-in chart type (and Flex) is sufficient. Triggers on: "custom chart", "build a custom chart", "no built-in chart type fits", "chart plugin", "manifest", "render/resize/buildQuery", "custom chart not in picker", "upload custom chart", "org release". Rare advanced path (~95% of users never need this). Not for Flex charts with built-in types (use data-visualization), embedding saved dashboards (use core), self-service chart editors (use analytics-studio), or auth setup (use core).