Validate hyperrectangular integration PDF outputs

[FlorianPfaff]

Summary

• Validate AbstractHyperrectangularDistribution.integrate() PDF evaluations before passing values to SciPy quadrature.
• Reject empty, vector/multi-value, non-real, and non-finite pdf outputs instead of flattening and integrating the first value.
• Add regression tests for vector and NaN custom hyperrectangular PDFs while preserving scalar-output integration behavior.

Bug fixed

integrate() previously did float(to_numpy(array(values)).reshape(-1)[0]) for each quadrature point. A malformed custom PDF returning multiple values for one point could therefore be silently reduced to its first value, producing a plausible but wrong integral. Non-finite values were also not rejected at the PyRecEst boundary.

Validation

• Syntax-checked the modified source and test files locally with ast.parse.
• Full pytest was not run in this environment because the sandbox cannot resolve github.com to clone/install the repository dependency set.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	60.76s
✅ JSON	prettier	7	0	0	0	0.87s
✅ JSON	v8r	7		0	0	4.25s
✅ MARKDOWN	markdownlint	68	0	0	0	1.52s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.63s
✅ PYTHON	black	1036	39	0	0	57.5s
✅ PYTHON	isort	1036	57	0	0	4.18s
✅ REPOSITORY	checkov	yes		no	no	46.75s
✅ REPOSITORY	gitleaks	yes		no	no	9.35s
✅ REPOSITORY	git_diff	yes		no	no	0.13s
✅ REPOSITORY	secretlint	yes		no	no	34.04s
✅ REPOSITORY	syft	yes		no	no	4.41s
✅ REPOSITORY	trivy-sbom	yes		no	no	9.96s
✅ REPOSITORY	trufflehog	yes		no	no	19.9s
✅ YAML	prettier	11	0	0	0	0.75s
✅ YAML	v8r	11		0	0	10.42s
✅ YAML	yamllint	11		0	0	0.65s

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