System 1 Arcade 0.2.1

The built-in agent runs on the GPU on Apple silicon Macs.

• Laya on the GPU with Metal. laya-go (updated to 1c1b85a) adds a Metal engine, and the
  built-in agent uses it on Macs with Apple silicon (M1 or newer) when the GPU passes a self-test
  at load; otherwise, including Intel Macs, some virtual machines, Windows and Linux, it runs on
  the CPU as before. New sentences take about half as long as on the CPU (Tetris: 38–64 ms at the
  median instead of 89–99 ms), with the same scores at the default settings.
• Less memory. The app uses about 1 GB while the built-in agent plays on the GPU, down from
  about 1.8 GB (the Metal engine keeps the model's fp16 weights as they are).
• Shows where it runs. The side panel says "It runs on the GPU (Metal)" (or the CPU) while the
  agent plays, the log says "Laya loaded on the GPU (Metal) in 99ms", with the reason when the GPU
  engine didn't start, and Test connection names the engine. LAYA_ENGINE=native or
  LAYA_ENGINE=metal chooses one for testing.
• cmd/headless also reports the median and p99 of the decisions over 10 ms (about the ones with
  a new sentence).

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Install: download System1Arcade-0.2.1.dmg, open it and drag System 1 Arcade to
Applications. It's a universal app (Apple silicon and Intel), signed with Developer ID and
notarized by Apple. Requires macOS 11 or later.

Built-in agent: runs Laya inside the app, with no Python. On first start it downloads the
Laya model (about 800 MB) into the Hugging Face cache while the game waits.