package:bench_press v0.4.1

• Interleaved BenchmarkGroup trials now run in blocks (sized for four
  ABBA BAAB visits over trials) and discard two batches at every switch
  between variants. The first batches after a switch carry state left by the
  previous variant; with every trial a switch, 0.4.0 roughly doubled the
  per-cell spread (robust_cv) on Wasm, and a single discard recovered only
  half of that. Two discards per switch restore the sequential baseline at about
  +20% wall-clock. See #71.