mlx-bun library API
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    interface SectionRouteResult {
        matchedAnchors: string[];
        newSection: { anchor: string; title: string } | null;
        stem: string;
    }
    Index
    matchedAnchors: string[]

    Existing-section anchors the chunk should update (the patch targets).

    newSection: { anchor: string; title: string } | null

    A newly-named section when no existing section fit AND the chunk is substantive for this article; null when it fit something or the model declined to name one.

    stem: string