Add ellipse geometry utilities

[FlorianPfaff]

Pull request

Summary

• Added shared ellipse geometry conversion and canonicalization helpers.
• Exported the new tracking utilities.
• Added coverage for geometry conversion, canonicalization, and covariance projection.
• Fixed CI test failures on PyTorch backends by updating the axis-swap test to pass a copied reversed array (axes[::-1].copy()), avoiding negative-stride array issues.

Checklist

• Tests were added or updated.
• Backend limitations were documented or added to src/pyrecest/_backend/capabilities.py.
• Shape, dtype, and measurement-set conventions were checked against docs/conventions.md.
• New user-facing failures use clear messages or shared exceptions from pyrecest.exceptions.
• Public examples and docs were updated when relevant.
• Performance-sensitive changes were checked against benchmarks/basic_regressions.py or a focused benchmark.
• python scripts/check_release_consistency.py --local-only passes when release metadata changed.
• The package smoke path still works: python -m build, twine check dist/*, install wheel, run a basic example.

[github-actions]

✅MegaLinter analysis: Success

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✅ REPOSITORY	git_diff	yes		no	no	0.12s
✅ REPOSITORY	secretlint	yes		no	no	25.8s
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✅ REPOSITORY	trivy-sbom	yes		no	no	6.65s
✅ REPOSITORY	trufflehog	yes		no	no	23.17s
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✅ YAML	v8r	11		0	0	10.29s
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[FlorianPfaff]

@copilot Fix CI/CD tests

[Copilot]

@copilot Fix CI/CD tests

Fixed in 5f2651a. I updated the failing test to use axes[::-1].copy() so it no longer passes a negative-stride array to the pytorch backend conversion path.