Reject non-real Bingham measurement and system vectors

[FlorianPfaff]

Summary

• reject boolean, textual, and complex-valued Bingham measurement vectors before backend arithmetic
• apply the same real-numeric validation to nonlinear Bingham system-function outputs
• add focused regression coverage for Python boolean/text inputs and backend boolean arrays

Bug

BinghamFilter validates measurement and nonlinear system-output vectors by shape, complex dtype, finiteness, and unit norm after backend conversion. Boolean vectors therefore slip through because booleans are finite numeric values and, for example, [True, False] has norm one. The filter silently interprets that vector as [1, 0], turning an upstream type error into a valid-looking orientation measurement/state.

Textual vectors can likewise reach backend-specific numerical conversion/arithmetic instead of being rejected consistently at the API boundary.

Fix

Validate raw vector inputs as unambiguously real numeric before converting them with the active backend. This rejects booleans, text/bytes, and complex values while preserving ordinary real Python lists and backend arrays.

Regression coverage

tests/filters/test_bingham_filter_real_vector_validation.py verifies rejection of:

• Python boolean measurement vectors
• backend boolean measurement arrays
• boolean nonlinear system outputs
• textual measurement vectors
• textual nonlinear system outputs

The branch is based directly on current main at baac3b1736bb8e81eafc1e3f69e10104636103b9 and is 2 commits ahead / 0 behind. It supersedes the earlier closed, unmerged draft #5340 with a clean branch on the current head.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no		no	7.11s
✅ JSON	prettier	7	0	0		0	0.78s
✅ JSON	v8r	7		0		0	5.16s
✅ MARKDOWN	markdownlint	68	0	0		0	2.06s
✅ MARKDOWN	markdown-table-formatter	68	0	0		0	0.43s
✅ PYTHON	black	1989	15	0		0	65.7s
✅ PYTHON	isort	1989	27	0		0	2.9s
✅ REPOSITORY	betterleaks	yes		no		no	1.24s
✅ REPOSITORY	checkov	yes		no		no	35.23s
✅ REPOSITORY	git_diff	yes		no		no	0.13s
✅ REPOSITORY	secretlint	yes		no		no	104.99s
✅ REPOSITORY	syft	yes		no		no	2.55s
✅ REPOSITORY	trivy-sbom	yes		no		no	2.88s
✅ YAML	prettier	11	0	0		0	0.59s
✅ YAML	v8r	11		0		0	16.85s
✅ YAML	yamllint	11		0		0	1.01s

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