Replace reduce_mean(keep_dims=false) -> rank-0 -> expand_dims with a single reduce_mean(axes=[1,2]) producing [1] directly. macOS 14's Espresso runtime mangles the rank-0 intermediate into rank 2, failing every prediction under all compute-unit presets. anchor is discarded by all hosts; x_pre verified bit-exact vs previous artifacts. Applies to ANE, ANE-zh, ANE-ja (ja vocoder is byte-identical to en).
