sdist build fails: FileNotFoundError for ../README.md

[gounthar]

Bug

Building the openai-harmony wheel from the PyPI sdist fails:

FileNotFoundError: [Errno 2] No such file or directory: '../README.md'

The build system references ../README.md (parent directory), which exists when building from a git clone of the monorepo but not when building from an extracted sdist tarball.

Steps to reproduce

pip wheel --no-binary :all: openai-harmony

Expected behavior

The wheel should build from the sdist without requiring the monorepo parent directory.

Environment

• Python 3.13.5
• pip 25.1.1
• Linux riscv64 (BananaPi F3, SpacemiT K1)

Suggested fix

Either include README.md in the sdist, or use a conditional path that falls back gracefully when the parent README is absent.

[gounthar]

Update: the error occurs specifically with pip wheel --no-binary :all:, which forces setuptools to handle the build instead of maturin. The setuptools fallback hits the ../README.md reference.

Building directly from the extracted sdist (pip wheel . in the sdist directory) should work fine with maturin. So this is a --no-binary edge case rather than a general sdist packaging bug.

Still, it might be worth adding a setup.py or setup.cfg fallback that handles the README path gracefully, since --no-binary :all: is a common pattern for cross-compilation and reproducible builds.