Single-file component authoring: a type-safe HTML builder (elements, attributes, children, escape-by-default, l:* wire bindings) plus a TemplateAdapter that renders a component's @LievitRender Html tree through the same wire pipeline as a template component (ADR-0003, ADR-0018). Pure Java, zero Spring, zero reflection beyond the one render-method invoke the core already performs; depends only on lievit-core.