Package templx bridges templ: children for templ components, and the
components of .templ files a vuka.File names. ui.Node is templ.Component,
so components need no adapter either way; children do, because templ
passes them on the context.
Components are the components of an embedded .templ file, in source order:
all of them for a file of the referencing package, the exported ones for a
file of a subdirectory's package.
Rec records a templ component's render into a live render tree: ui.Rec.
The vuka command compiles the .templ files of a module requiring ui to
call it, so on a live page their markup diffs as JSX does.