mlx-bun library API
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    interface QwenFoldPlan {
        deviations: string[];
        extraHead: { from: string; gamma: string; name: string } | null;
        gammaNames: string[];
        ops: Map<string, FoldOp>;
    }
    Index
    deviations: string[]
    extraHead: { from: string; gamma: string; name: string } | null

    Tied-embedding case: emit an extra folded lm_head cloned from from.

    gammaNames: string[]

    Names of the γ tensors the executor must preload (tiny, held for the whole walk so shard release never invalidates them).

    ops: Map<string, FoldOp>