Support Apple Silicon

[JoshuaKirby88]

Problem

The project didn’t support running on macOS Apple Silicon (MPS).

Approach

• Added a macOS Apple Silicon setup guide (MACOS_SETUP.md) and linked it from the README.md.
• Updated GPU detection / GPU worker selection to recognize MPS in addition to CUDA, while keeping the existing CUDA path as-is as much as possible (and only adding a safe MPS check on the non-CUDA/CPU path).
• Updated the agent’s device-selection guidance and seed-setting snippet to handle MPS.
• Updated the i_cant_believe_its_not_better* examples to select cuda → mps → cpu, and guarded torch.compile / MPS checks for compatibility.

Limitations

• MPS is treated as a single device, and multi-device scheduling is still CUDA-oriented.
• This improves defaults and common entrypoints, but LLM-generated experiment code can still explicitly reference cuda.
• No tests are added for macOS/MPS behavior.

[Copilot]

Pull request overview

This PR adds support for running AI Scientist-v2 on macOS with Apple Silicon by integrating Metal Performance Shaders (MPS) backend support throughout the codebase.

Key changes:

• Added MPS device detection and selection logic alongside existing CUDA support
• Updated GPU count detection to recognize MPS as a single-device backend
• Created comprehensive macOS setup documentation with installation instructions

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
launch_scientist_bfts.py	Added MPS device detection to GPU enumeration logic
ai_scientist/treesearch/parallel_agent.py	Updated device selection guidelines, GPU counting, and random seed initialization to support MPS
ai_scientist/ideas/i_cant_believe_its_not_better.py	Modified device selection and torch.compile conditional to include MPS
ai_scientist/ideas/i_cant_believe_its_not_betterrealworld.py	Modified device selection and torch.compile conditional to include MPS
README.md	Added reference to macOS setup documentation
MACOS_SETUP.md	New documentation file with detailed Apple Silicon installation and setup instructions

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