Preserve sequence node type validation

[FlorianPfaff]

Summary

• simplify the public sequence node wrapper so base-class validation runs first
• add regression coverage for invalid public node flag input

Validation

• Compared branch against current main: 2 commits ahead, 0 behind
• Full local test execution was not possible because this environment cannot resolve github.com for cloning/installing the repository.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	45.27s
✅ JSON	prettier	7	0	0	0	0.98s
✅ JSON	v8r	7		0	0	4.12s
✅ MARKDOWN	markdownlint	68	0	0	0	1.48s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.52s
✅ PYTHON	black	1095	0	0	0	43.51s
✅ PYTHON	isort	1095	0	0	0	2.06s
✅ REPOSITORY	checkov	yes		no	no	36.74s
✅ REPOSITORY	gitleaks	yes		no	no	7.85s
✅ REPOSITORY	git_diff	yes		no	no	0.19s
✅ REPOSITORY	secretlint	yes		no	no	35.12s
✅ REPOSITORY	syft	yes		no	no	3.82s
✅ REPOSITORY	trivy-sbom	yes		no	no	2.97s
✅ REPOSITORY	trufflehog	yes		no	no	11.19s
✅ YAML	prettier	11	0	0	0	0.58s
✅ YAML	v8r	11		0	0	7.66s
✅ YAML	yamllint	11		0	0	0.42s

Notices

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