Validate track manager integer inputs

[FlorianPfaff]

Summary

• validate TrackManager lifecycle thresholds as integer scalars before storing them
• reject fractional, boolean, non-finite, and shaped-array association indices before normalization
• add regression coverage for lifecycle threshold and association-index validation

Root cause

TrackManager and association normalization used bare int(...) conversions. That silently truncated fractional values like 1.5 and treated booleans as 0/1, which can change track confirmation/deletion timing or normalize associations to the wrong track/measurement.

Tests

• py -3.12 -m pytest -q tests\filters\test_track_manager.py
• py -3.12 -m ruff check src tests
• git diff --check
• git diff --cached --check

[github-actions]

✅MegaLinter analysis: Success

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✅ MARKDOWN	markdown-table-formatter	66	0	0	0	0.8s
✅ PYTHON	black	772	0	0	0	35.94s
✅ PYTHON	isort	772	0	0	0	2.03s
✅ REPOSITORY	checkov	yes		no	no	42.95s
✅ REPOSITORY	gitleaks	yes		no	no	15.72s
✅ REPOSITORY	git_diff	yes		no	no	0.23s
✅ REPOSITORY	secretlint	yes		no	no	24.2s
✅ REPOSITORY	syft	yes		no	no	9.49s
✅ REPOSITORY	trivy-sbom	yes		no	no	4.87s
✅ REPOSITORY	trufflehog	yes		no	no	20.31s
✅ YAML	prettier	11	0	0	0	0.67s
✅ YAML	v8r	11		0	0	11.28s
✅ YAML	yamllint	11		0	0	0.51s

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