Add association hypothesis and gating helpers

[FlorianPfaff]

Summary

• Add a small data-oriented AssociationHypothesis representation for track/measurement scores.
• Add reusable NIS, cost-threshold, probability-threshold, and top-k gates.
• Add linear-Gaussian hypothesis generation with innovation, innovation covariance, NIS, and log-likelihood diagnostics.
• Add conversion helpers from hypotheses to cost, log-likelihood, and probability matrices.
• Add a TrackManager-compatible linear-Gaussian hypothesis associator built on the existing global-nearest-neighbor assignment utility.
• Export the helpers from pyrecest.filters and document them in the API overview.
• Add focused regression tests for Gaussian hypotheses, gating, cost-matrix conversion, and assignment.

Validation

Not run locally in this connector environment.

Notes

This intentionally avoids a large tracking-framework hierarchy. The goal is to standardize hypothesis diagnostics and gating while reusing existing PyRecEst association and TrackManager machinery.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	33.52s
✅ JSON	prettier	2	0	0	0	0.42s
✅ JSON	v8r	2		0	0	2.48s
✅ MARKDOWN	markdownlint	28	0	0	0	1.29s
✅ MARKDOWN	markdown-table-formatter	28	0	0	0	0.39s
✅ PYTHON	bandit	519		0	0	8.45s
✅ PYTHON	black	519	8	0	0	14.02s
✅ PYTHON	flake8	519		0	0	4.81s
✅ PYTHON	isort	519	10	0	0	0.96s
✅ PYTHON	mypy	519		0	0	6.38s
✅ PYTHON	pylint	519		0	0	114.74s
✅ PYTHON	ruff	519	10	0	0	0.1s
✅ REPOSITORY	checkov	yes		no	no	22.84s
✅ REPOSITORY	gitleaks	yes		no	no	7.81s
✅ REPOSITORY	git_diff	yes		no	no	0.07s
✅ REPOSITORY	secretlint	yes		no	no	9.77s
✅ REPOSITORY	syft	yes		no	no	4.35s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.84s
✅ REPOSITORY	trufflehog	yes		no	no	21.04s
✅ YAML	prettier	5	0	0	0	0.54s
✅ YAML	v8r	5		0	0	5.0s
✅ YAML	yamllint	5		0	0	0.47s

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[github-actions]

Test Results

     8 files  +     8       8 suites  +8   1h 9m 38s ⏱️ + 1h 9m 38s
 1 537 tests + 1 537   1 536 ✅ + 1 536      1 💤 +    1  0 ❌ ±0 
12 664 runs  +12 664  11 596 ✅ +11 596  1 068 💤 +1 068  0 ❌ ±0 

Results for commit f95ae9a. ± Comparison against base commit 6df9071.

♻️ This comment has been updated with latest results.