/**
 * Quarto adapter (.qmd) — notebook-first.
 *
 * A .qmd is treated as a notebook that doesn't serialize outputs:
 *   - optional YAML front matter (kept opaque; jupyter/nebula keys normalized)
 *   - ```{lang ...} fences are code cells; `#| id: x` carries the cell id;
 *     all other `#|` chunk options stay in cell content verbatim (they are
 *     valid comments) and are never interpreted
 *   - prose between fences becomes markdown cells
 *
 * No Quarto rendering, no chunk-option semantics, one kernel per document.
 *
 * Markdown cells are delimited by an HTML-comment marker mirroring the
 * chunk-option syntax: `<!-- #| id: abc -->`. HTML comments are invisible in
 * rendered Quarto output, so this is notebook-first without rendering cost:
 * adjacent markdown cells stay distinct, empty markdown cells survive, and
 * markdown ids persist (no positional fallback for Nebula-written files).
 * Foreign .qmd files without markers still parse (one implicit markdown cell
 * per prose block, positional ids); markers appear on first Nebula save.
 *
 * Known unrepresentables (inherent):
 *   - markdown content containing a bare ```{lang} fence-open line outside a
 *     wrapping plain fence is indistinguishable from a real code chunk (in
 *     Quarto itself too) and will re-parse as one
 *   - a markdown content line that is itself a `<!-- #| id: ... -->` marker
 *     will re-parse as a cell boundary
 */
import { NotebookFormatAdapter } from './types';
export declare const qmdAdapter: NotebookFormatAdapter;