docs(is-native-element): disambiguate 'native' in the JSDoc

'Native' is overloaded in the web platform context. The util name
remains isNativeElement (common convention in React/Vue/Angular
ecosystems for 'platform-provided, not a component'), but the JSDoc
now explicitly names three alternative meanings of 'native' that
this util does NOT answer:

  - 'native accessibility' / 'widget-ness' — interactive-roles.js
    (aria-query widget taxonomy)
  - 'native interactive content' — html-interactive-content.js
    (HTML §3.2.5.2.7 content-model question)
  - 'natively focusable' — HTML §6.6.3 sequential focus navigation

This util answers only: is this tag a first-class built-in element
of HTML/SVG/MathML, rather than a component invocation or a
scope-shadowed local binding? Callers compose it with the more
specific utils when they need a narrower question.

Author: johanrd

lib/utils/is-native-element.js

@@ -17,6 +17,24 @@ const ELEMENT_TAGS = new Set([...htmlTags, ...svgTags, ...mathmlTagNames]);
  * element — i.e. the tag name is in the authoritative list AND is not
  * shadowed by an in-scope binding.
  *
+ * "Native" here means **spec-registered tag name** (in the HTML, SVG, or
+ * MathML spec registries, reached via the `html-tags` / `svg-tags` /
+ * `mathml-tag-names` packages). It is NOT the same as:
+ *
+ *  - "native accessibility" / "widget-ness" — see `interactive-roles.js`
+ *    (aria-query widget taxonomy; an ARIA-tree-semantics question)
+ *  - "native interactive content" / "focus behavior" — see
+ *    `html-interactive-content.js` (HTML §3.2.5.2.7; an HTML-content-model
+ *    question about which tags can be nested inside what)
+ *  - "natively focusable" / sequential-focus — see HTML §6.6.3
+ *
+ * This util answers only: "is this tag a first-class built-in element of one
+ * of the three markup-language standards, rather than a component invocation
+ * or a shadowed local binding?" Callers compose it with the other utils
+ * above when they need a more specific question (see e.g. `template-no-
+ * noninteractive-tabindex`, which consults both this and
+ * `html-interactive-content`).
+ *
  * Returns false for:
  *  - components (PascalCase, dotted, @-prefixed, this.-prefixed, ::-namespaced —
  *    none of these tag names appear in the HTML/SVG/MathML lists)