Reject non-finite and invalid GGIW inputs

[FlorianPfaff]

Bugs

GGIWTracker accepted several mathematically invalid inputs:

• NaN/infinite gamma_shape, gamma_rate, extent_degrees_of_freedom, and extent_innovation_weight could pass sign-only validation and poison the Gamma/IW state.
• constructor/update extent_innovation_weight=np.nan was accepted because nan < 0 is false.
• covariance and extent matrices were silently symmetrized instead of enforcing PyRecEst's documented finite/symmetric/PSD covariance contract.
• extent_is_scale accepted arbitrary truthy values such as the string "False".

Fix

• require finite scalar hyperparameters before their range checks
• validate extent_is_scale as an actual boolean
• use the shared assert_covariance_matrix contract for covariance and extent inputs while retaining strict positive-definite Cholesky checks where required
• validate update-time extent innovation weights
• add regressions for non-finite scalars, non-boolean flags, asymmetric/non-finite matrices, and valid finite behavior

The changes are limited to GGIWTracker and a dedicated regression file.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no		no	7.52s
✅ JSON	prettier	7	0	0		0	0.74s
✅ JSON	v8r	7		0		0	4.2s
✅ MARKDOWN	markdownlint	68	0	0		0	2.37s
✅ MARKDOWN	markdown-table-formatter	68	0	0		0	0.41s
✅ PYTHON	black	2018	2	0		0	64.0s
✅ PYTHON	isort	2018	2	0		0	2.92s
✅ REPOSITORY	betterleaks	yes		no		no	1.56s
✅ REPOSITORY	checkov	yes		no		no	33.05s
✅ REPOSITORY	git_diff	yes		no		no	0.23s
✅ REPOSITORY	secretlint	yes		no		no	103.24s
✅ REPOSITORY	syft	yes		no		no	3.04s
✅ REPOSITORY	trivy-sbom	yes		no		no	2.6s
✅ YAML	prettier	11	0	0		0	0.76s
✅ YAML	v8r	11		0		0	17.09s
✅ YAML	yamllint	11		0		0	0.87s

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