[jhodges10]

Summary

Use uv for reproducible development environments and package builds, and replace the custom setuptools build integration with scikit-build-core. Native compilation continues through the existing CMake project, with standard PEP 517 frontends such as pip supported.

Python 3.9–3.15 support is preserved. VFX Reference Platform builds continue to use the Python interpreter, compiler, and libraries supplied by each ASWF image.

Changes

• Move package metadata, dependency groups, and coverage configuration into pyproject.toml, with development dependencies pinned in uv.lock.
• Replace the root setup.py build logic with scikit-build-core. Read the package version from _version.py and update the release helpers to use it.
• Bundle native dependency sources in source distributions, build wheels from those archives, and verify installed package metadata, native modules, adapters, and console entry points.
• Update the Makefile, packaging and documentation workflows, Read the Docs configuration, and contributor instructions to use uv.
• Keep the CY2023–CY2027 CI matrix on its platform-provided toolchains, disable uv-managed Python downloads there, and retain the native MinGW packaging path.

Existing Flake8 rules and Python formatting are retained for this PR.

Validation

• Native editable build and all 487 existing Python tests passed, with two skips.
• Source distribution and wheel builds passed, including a wheel built from the source archive and smoke-tested in a clean environment.
• Flake8, lockfile validation, strict Sphinx documentation, and workflow validation passed.

This remains a draft for cross-platform CI validation. Container checks run in CI; no local emulation was used.

PR stack

1. This PR: uv and scikit-build-core.
2. #2090 — Ruff setup and formatting.
3. #2091 — VFX devcontainer and VS Code development tasks.

Merge in this order, retargeting each follow-up to main after its prerequisite lands and rebasing if needed.

Assisted-by: Codex / GPT-6.1 Sol

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.59%. Comparing base (80c5ff3) to head (6957b8e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2082   +/-   ##
=======================================
  Coverage   83.59%   83.59%           
=======================================
  Files         184      185    +1     
  Lines       13632    13633    +1     
  Branches     1271     1271           
=======================================
+ Hits        11395    11396    +1     
  Misses       2064     2064           
  Partials      173      173           

Flag	Coverage Δ
py-unittests	83.59% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
src/py-opentimelineio/opentimelineio/__init__.py	100.00% <100.00%> (ø)
src/py-opentimelineio/opentimelineio/_version.py	100.00% <100.00%> (ø)

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