[codex] Add independent beta release for the Python SDK

[aibrahim-oai]

Why

openai-codex needs a beta release lifecycle without requiring beta releases of its pinned runtime package. Previously, SDK staging rewrote its runtime dependency to the SDK version, which made an SDK-only beta impossible.

What changed

• Set the initial SDK beta version to 0.1.0b1 and pin it to published stable openai-codex-cli-bin==0.132.0.
• Decoupled SDK release staging from runtime versioning so it preserves the reviewed exact runtime pin.
• Added a python-v* tag workflow that builds and publishes only openai-codex through PyPI trusted publishing.
• Removed the Beta classifier from runtime package metadata for future runtime publications.
• Regenerated protocol-derived SDK models from the selected stable runtime package.

0.132.0 is the newest stable runtime admitted by the checked-in dependency date fence and retains the Linux wheel family currently used by SDK CI.

Release setup

Before pushing python-v0.1.0b1, configure PyPI trusted publishing for the openai-codex project with workflow python-sdk-release.yml, environment pypi, and job publish-python-sdk.

Validation

• uv run --frozen --extra dev ruff check src/openai_codex scripts examples tests
• Parsed .github/workflows/python-sdk-release.yml with PyYAML.
• Built staged release artifacts locally: openai_codex-0.1.0b1-py3-none-any.whl and openai_codex-0.1.0b1.tar.gz.
• Verified wheel metadata pins openai-codex-cli-bin==0.132.0.
• Tests are deferred to online CI for this PR.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Run the SDK release build on a musl-compatible runner

For a python-v* tag this job runs on ubuntu-latest, but this uv sync installs the locked openai-codex-cli-bin==0.132.0 dependency before staging. The lockfile only contains macOS, Windows, and musllinux wheels for that package (sdk/python/uv.lock lines 310-319), so on Ubuntu/glibc uv reports that the distribution has no wheel for the current platform and the release workflow fails before publishing. Run this step in the same Alpine/musl environment used by the SDK CI, or avoid requiring the runtime wheel on the Ubuntu release runner.

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[chatgpt-codex-connector]

Keep the Python SDK version monotonic

Publishing the new beta as 0.1.0b1 makes it sort lower than the already-published SDK versions such as 0.131.0a4 under PEP 440, so users asking pip/uv for --pre openai-codex or for an upgrade will continue to receive the older 0.131.0a4 release instead of this independent beta. The SDK can pin an older runtime independently, but the SDK distribution version itself still needs to be greater than the existing releases (for example a new major/minor scheme that is monotonic) for the beta release lifecycle to be discoverable by normal package resolution.

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