mlx-bun library API
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    interface FillRow {
        emit: number[];
        kind: FillKind;
        requiresContext?: true;
        trigger: number[];
    }
    Index
    emit: number[]

    Ids appended immediately after the trigger. Sliced out of a full template rendering — never encode(fragment) in isolation.

    kind: FillKind
    requiresContext?: true

    Template-derived rows need a parser-owned context before asserting.

    trigger: number[]

    Token ids that must be the TAIL of the generated history for this row to fire (matched as an exact suffix ending at the token just pushed).