quarb-text-html 0.21.0

HTML producer for the Quarb text level: reduces a page to what it says — headings, paragraphs, quotes, lists, verbatim blocks, tables — and drops the markup soup. The DOM-faithful view is quarb-html; this crate lowers the same substrate into the shared quarb-text vocabulary, so //section[::lemma ...] and //paragraph read the same over a page as over any other text substrate.

Producer rules (the HTML-specific knowledge lives here):

• h1–h6 become flat [Block::Heading]s; quarb-text derives the enclosing section tree.
• Soup is dropped: script, style, nav, header, footer, aside, form, media elements, the whole head — and, whatever the element, ARIA chrome (landmark roles like navigation/banner, or aria-hidden="true").
• Structural wrappers (div, section, article, main, …) are transparent: their flow content is walked, the wrapper itself leaves no node.
• A blockquote's trailing cite/footer child — or the figcaption of a figure-wrapped quote — becomes the quote's hypograph (attribution).
• pre becomes a verbatim block, language from a language-* class; table becomes a [Block::Table] (caption from <caption>, headers from thead/th cells), denormalized to nested lists by quarb-text.
• Inline markup flattens to its text.