Harden labeled evaluation and tracking edge cases

[FlorianPfaff]

Summary:

• Guard legacy real-label evaluation and validate label/detection box geometry.
• Restrict labeled metrics, FROC, and bootstrap intervals to reviewed scored frames.
• Harden registration-quality and legacy-driver numeric validation.
• Skip invalid velocity-fit tracks and ignore nonfinite points in linear velocity fits.

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	0.46s
✅ COPYPASTE	jscpd	yes		no	no	6.13s
✅ MARKDOWN	markdownlint	19	0	0	0	1.86s
✅ PYTHON	ruff	127	0	0	0	0.3s
✅ REPOSITORY	git_diff	yes		no	no	0.03s
✅ YAML	prettier	10	0	0	0	0.99s
✅ YAML	v8r	10		0	0	4.91s
✅ YAML	yamllint	10		0	0	0.99s

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