Handle flat empty MEM-EKF measurement scans

[FlorianPfaff]

Summary

• Treat a flat empty measurement array as a zero-column MEM-EKF scan.
• Add a regression test that update(array([])) is a no-op, matching the existing array([[], []]) empty-scan behavior.

Testing

• python -m py_compile /tmp/mem_ekf_tracker.py /tmp/test_mem_ekf_tracker.py

I could not run the full repository pytest suite locally because this container cannot resolve github.com to clone/install the repository.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	58.69s
✅ JSON	prettier	7	0	0	0	0.86s
✅ JSON	v8r	7		0	0	4.36s
✅ MARKDOWN	markdownlint	68	0	0	0	1.75s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.78s
✅ PYTHON	black	878	0	0	0	40.75s
✅ PYTHON	isort	878	0	0	0	8.01s
✅ REPOSITORY	checkov	yes		no	no	43.1s
✅ REPOSITORY	gitleaks	yes		no	no	10.2s
✅ REPOSITORY	git_diff	yes		no	no	0.1s
✅ REPOSITORY	secretlint	yes		no	no	27.59s
✅ REPOSITORY	syft	yes		no	no	2.98s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.9s
✅ REPOSITORY	trufflehog	yes		no	no	20.73s
✅ YAML	prettier	11	0	0	0	0.77s
✅ YAML	v8r	11		0	0	10.6s
✅ YAML	yamllint	11		0	0	0.46s

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