Harden artifact filtering and label validation

[FlorianPfaff]

Summary

• validate recurrent artifact config, phase, revolution, and shape inputs
• validate map-risk frame shapes and cross-map confirming counts
• reject malformed/duplicate reviewed labels in real-data and comparison loaders

Verification

• python -m pytest
• python -m ruff check beltmap scripts tests
• git diff --check

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	8		0	0	0.52s
✅ COPYPASTE	jscpd	yes		no	no	5.85s
✅ MARKDOWN	markdownlint	19	0	0	0	1.91s
✅ PYTHON	ruff	127	0	0	0	0.35s
✅ REPOSITORY	git_diff	yes		no	no	0.02s
✅ YAML	prettier	10	0	0	0	1.02s
✅ YAML	v8r	10		0	0	4.64s
✅ YAML	yamllint	10		0	0	1.02s

Notices

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