Reject non-boolean point-set reflection flags

[FlorianPfaff]

Summary

• validate allow_reflection as a real boolean in point-set transform estimation
• validate the same flag at the joint registration entry point so invalid values fail before the iterative loop
• accept Python and NumPy booleans while rejecting truthy strings, integers, and None

Bug fixed

Previously, allow_reflection="False" was truthy. For rigid registration this could silently enable improper transforms (determinant -1) even though the supplied value reads as false.

Tests

• regression coverage for invalid non-boolean values in estimate_transform
• wrapper-level regression for joint_registration_assignment
• confirms np.bool_(True) still enables a reflected rigid fit

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no		no	7.91s
✅ JSON	prettier	7	0	0		0	0.68s
✅ JSON	v8r	7		0		0	3.6s
✅ MARKDOWN	markdownlint	68	0	0		0	2.42s
✅ MARKDOWN	markdown-table-formatter	68	0	0		0	0.41s
✅ PYTHON	black	2032	0	0		0	67.4s
✅ PYTHON	isort	2032	2	0		0	3.02s
✅ REPOSITORY	betterleaks	yes		no		no	1.52s
✅ REPOSITORY	checkov	yes		no		no	34.94s
✅ REPOSITORY	git_diff	yes		no		no	0.25s
✅ REPOSITORY	secretlint	yes		no		no	110.25s
✅ REPOSITORY	syft	yes		no		no	2.88s
✅ REPOSITORY	trivy-sbom	yes		no		no	2.93s
✅ YAML	prettier	11	0	0		0	0.96s
✅ YAML	v8r	11		0		0	17.03s
✅ YAML	yamllint	11		0		0	0.85s

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