Publish r-lib-ir wheels to PyPI

[t-kalinowski]

Summary

Make ir installable from PyPI with uv tool install r-lib-ir, which installs both ir and rx. Extend the tag-driven release so GitHub and PyPI artifacts use the same package version, and only restore the development version after public installs work.

User-facing changes

• Add PyPI metadata for binary-only Maturin wheels under the package name r-lib-ir.
• Publish wheels for macOS ARM and x86, manylinux ARM and x86, and Windows x86.
• Document the uv install command and the one-time Trusted Publisher setup.
• Install and verify uv from the Unix and Windows development setup scripts so a fresh development environment can run the full check.

Internal changes

• Build and install-test every release wheel before publishing the GitHub Release, then publish to PyPI with OIDC.
• Require the release tag to match the Cargo package version and verify the complete five-wheel set.
• Retry public PyPI visibility in the release script and stop before the post-release +dev commit if either installed command fails.
• Pin setup-uv to a published exact release in CI and release workflows.
• Key Python resolution markers by the effective UV_CACHE_DIR and UV_PYTHON_INSTALL_DIR, allowing reuse without crossing uv storage roots.
• Add CI coverage that builds a wheel and verifies that uv tool install exposes both executables, plus release-sequencing and cache-key regressions.

Notes

The first PyPI release requires the pypi GitHub environment and the pending Trusted Publisher described in RELEASE.md. The workflow publishes wheels only, without a source distribution.

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