Reject non-finite tracklet Viterbi costs

[FlorianPfaff]

What changed

• validate TrackletAssociationCandidate.unary_cost as a finite scalar
• validate custom transition costs in both full and fixed-lag tracklet Viterbi paths
• add regressions covering NaN, +inf, and -inf

Why

Non-finite unary or transition costs currently enter the dynamic-programming tables. In particular, a NaN unary cost can win Python's tuple-based terminal minimum by position and produce a NaN total cost even when a finite missed-detection alternative exists. The sequence-association solver already enforces the corresponding finite-cost invariant; the tracklet solver should do the same.

Validation

A focused standalone regression is executed while publishing the patch. The normal repository CI will run on the resulting PR branch.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	26.93s
✅ JSON	prettier	7	0	0	0	1.04s
✅ JSON	v8r	7		0	0	4.29s
✅ MARKDOWN	markdownlint	68	0	0	0	2.01s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.74s
✅ PYTHON	black	1563	208	0	0	101.62s
✅ PYTHON	isort	1563	382	0	0	2.81s
✅ REPOSITORY	betterleaks	yes		no	no	2.83s
✅ REPOSITORY	checkov	yes		no	no	57.27s
✅ REPOSITORY	gitleaks	yes		no	no	15.83s
✅ REPOSITORY	git_diff	yes		no	no	0.41s
✅ REPOSITORY	secretlint	yes		no	no	69.75s
✅ REPOSITORY	syft	yes		no	no	6.56s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.38s
✅ REPOSITORY	trufflehog	yes		no	no	33.32s
✅ YAML	prettier	11	0	0	0	0.8s
✅ YAML	v8r	11		0	0	12.46s
✅ YAML	yamllint	11		0	0	0.71s

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