Add C++ tangency backend and backend dispatcher

[t-uda]

Summary

• introduce backend selection helpers and expose them through the solver API so callers can choose between Python and C++ tangency implementations
• implement a C++ tangency solver compiled on demand via g++ and wrapped with ctypes to mirror the Python algorithm step for step
• add regression tests that compare the C++ backend with the existing Python code for individual tangencies and pairwise distances

Testing

• poetry run black src tests
• poetry run flake8
• poetry run mypy src tests
• poetry run pytest

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https://chatgpt.com/codex/tasks/task_e_68cea058fcc88323a42d04c751391ee8

[t-uda]

@codex move the compilation part to a build script or setup.py. Include pre-built shared obj/lib into a package when poetry build is invoked.

[chatgpt-codex-connector]

Summary

• Added shared build helpers, a Poetry build script, and a custom PEP 517 backend so the C++ tangency library is compiled ahead of packaging workflows. build_helpers.pyL1-L71 build_backend.pyL1-L35 build.pyL1-L10
• Updated Poetry configuration to include the compiled artifacts in wheels and to execute the build script during poetry build. pyproject.tomlL32-L57
• Simplified the runtime C++ loader to rely on the pre-built shared library and surface clearer errors when it is missing. src/ellphi/_tangency_cpp.pyL1-L167

Testing

• ✅ poetry run black build_helpers.py
• ✅ poetry run flake8
• ✅ poetry run mypy src tests
• ✅ poetry run pytest
• ⚠️ poetry build (fails: no network access to pypi.org)

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[t-uda]

@codex fix CI

[chatgpt-codex-connector]

Summary

• Implemented standalone build helpers and a custom PEP 517 backend that compile the tangency C++ library and assemble wheels/sdists without external tooling, ensuring the packaged artifacts include the compiled shared object. build_helpers.pyL1-L131 build_backend.pyL1-L238
• Added a Poetry build script and configuration to run the compilation step during packaging and to bundle the generated library in distribution outputs for offline builds. build.pyL1-L14 pyproject.tomlL1-L52

Testing

• ✅ poetry run black build_backend.py build_helpers.py build.py src tests
• ✅ poetry run flake8
• ✅ poetry run mypy src tests
• ✅ poetry run pytest
• ✅ poetry build

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[t-uda]

@codex fix CI definition.

[chatgpt-codex-connector]

Summary

• Updated the CI workflow matrix to exercise Python 3.10–3.12, aligning with the package’s declared Python ≥3.10 support. .github/workflows/python-app.ymlL15-L53

Testing

• ⚠️ tests not run (CI workflow change only)

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