Validate sensor model state vectors

[FlorianPfaff]

Summary

• validate sensor-model state inputs as one-dimensional arrays before indexing
• normalize backend conversion failures to a clear ValueError
• apply the validation to both package-level and direct module imports
• add regressions for scalar, row-matrix, and column-matrix states

Root cause

The shared sensor-model _state_vector() helper only converted the input through the active backend. Callers immediately accessed state.shape[0], so a scalar state leaked IndexError: tuple index out of range. Matrix-shaped states progressed further and failed with misleading errors about indices or scalar ranges, and some measurement paths could broadcast them incorrectly.

Impact

Invalid state ranks now fail at the public sensor-model boundary with a stable, actionable ValueError instead of backend- and code-path-dependent failures.

Validation

• reproduced the scalar-state IndexError on the previous implementation
• exercised package-level and direct-module imports with valid vectors
• verified scalar, row-matrix, and column-matrix inputs all raise the new validation error
• compiled the new validation module successfully

GitHub Actions will provide the full repository test matrix.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	21.31s
✅ JSON	prettier	7	0	0	0	1.05s
✅ JSON	v8r	7		0	0	3.96s
✅ MARKDOWN	markdownlint	68	0	0	0	1.93s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.71s
✅ PYTHON	black	1491	183	0	0	89.88s
✅ PYTHON	isort	1491	328	0	0	2.52s
✅ REPOSITORY	betterleaks	yes		no	no	2.32s
✅ REPOSITORY	checkov	yes		no	no	54.3s
✅ REPOSITORY	gitleaks	yes		no	no	14.09s
✅ REPOSITORY	git_diff	yes		no	no	0.42s
✅ REPOSITORY	secretlint	yes		no	no	67.51s
✅ REPOSITORY	syft	yes		no	no	6.06s
✅ REPOSITORY	trivy-sbom	yes		no	no	7.56s
✅ REPOSITORY	trufflehog	yes		no	no	31.64s
✅ YAML	prettier	11	0	0	0	0.68s
✅ YAML	v8r	11		0	0	10.67s
✅ YAML	yamllint	11		0	0	0.57s

Notices

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