Validate finite set metric order values

[FlorianPfaff]

Summary

• Reject non-finite OSPA/GOSPA order values before computing assignment costs.
• Preserve the existing cutoff validation and public metric exports.
• Add regression coverage for NaN and infinite order inputs.

Validation

• Inspected main..fix-metrics-order; branch is 1 commit ahead and 0 behind main.
• Not run: full local test suite in this connector session.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	71.78s
✅ JSON	prettier	7	0	0	0	1.33s
✅ JSON	v8r	7		0	0	4.97s
✅ MARKDOWN	markdownlint	68	0	0	0	1.73s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.96s
✅ PYTHON	black	1194	30	0	0	60.54s
✅ PYTHON	isort	1194	58	0	0	3.74s
✅ REPOSITORY	checkov	yes		no	no	47.09s
✅ REPOSITORY	gitleaks	yes		no	no	11.88s
✅ REPOSITORY	git_diff	yes		no	no	0.31s
✅ REPOSITORY	secretlint	yes		no	no	43.89s
✅ REPOSITORY	syft	yes		no	no	4.96s
✅ REPOSITORY	trivy-sbom	yes		no	no	5.5s
✅ REPOSITORY	trufflehog	yes		no	no	18.19s
✅ YAML	prettier	11	0	0	0	0.82s
✅ YAML	v8r	11		0	0	11.16s
✅ YAML	yamllint	11		0	0	0.44s

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