Reject reversed linear integration bounds

[FlorianPfaff]

Summary

• reject Euclidean integration intervals where any lower bound exceeds its upper bound
• apply the validation in the shared static integration helper so instance and direct helper calls behave consistently
• add regression coverage for scalar 1-D, multidimensional, and direct helper usage

Why

SciPy treats reversed integration limits as signed integrals. For probability densities this can silently return negative probability mass instead of reporting an invalid interval.

Scope

Two files only; no behavior changes for valid or zero-width intervals.

[github-actions]

✅MegaLinter analysis: Success

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✅ JSON	v8r	7		0		0	3.58s
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✅ MARKDOWN	markdown-table-formatter	68	0	0		0	0.45s
✅ PYTHON	black	2012	26	0		0	48.29s
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✅ REPOSITORY	betterleaks	yes		no		no	1.21s
✅ REPOSITORY	checkov	yes		no		no	25.97s
✅ REPOSITORY	git_diff	yes		no		no	0.18s
✅ REPOSITORY	secretlint	yes		no		no	76.65s
✅ REPOSITORY	syft	yes		no		no	2.06s
✅ REPOSITORY	trivy-sbom	yes		no		no	2.15s
✅ YAML	prettier	11	0	0		0	0.42s
✅ YAML	v8r	11		0		0	11.45s
✅ YAML	yamllint	11		0		0	0.8s

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