Embeddable editor

@vertex/web-editor publishes two custom elements:

Element	Purpose	Current size budget
<vertex-editor>	Full editable CodeMirror experience	1250 KiB minified
<vertex-editor-lite>	Native, read-only code display	500 KiB minified

Both use the compact web language profile: JavaScript, TypeScript, HTML, CSS, and JSON. Language modules load lazily and are cached.

The editor does not include project preview, a file tree, Git, a terminal, deployment, or Vertex application services.

Use the full element for user input. Prefer the lite element for documentation, lessons, snippets, and other read-only presentation.