allow isolated build to succeed

[asottile-augment]

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[augment-app-staging]

🤖 Augment PR Summary

Summary: Adds a minimal pyproject.toml so PEP 517 isolated builds can provision build-time dependencies.

Changes:

• Declares setuptools and torch as build requirements
• Uses the legacy setuptools backend to keep the existing setup.py-driven build flow

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[augment-app-staging]

Review completed. 2 suggestions posted.

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[augment-app-staging]

setuptools>=77.0.3 effectively requires Python >=3.9 (per setuptools’ own requires_python), so isolated builds will fail on Python 3.7/3.8 even though this repo still references 3.6–3.8 (e.g., setup.py classifiers, docs build on 3.7). Can you confirm dropping <3.9 is intended?

Severity: high

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[augment-app-staging]

Adding torch to build-system.requires means PEP 517 build isolation will install a potentially different PyTorch than the runtime environment, which can break precompiled op loads via assert_torch_info (torch/cuda mismatch). It can also cause installs to fail on setups where torch isn’t pip-installable in the isolated env (even if torch is available via conda/system site-packages).

Severity: medium

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