Preserve Gaussian subclasses in multiply and convolve

[FlorianPfaff]

Bug

GaussianDistribution.shift() and the conversion factories preserve derived Gaussian types, but multiply() and convolve() hard-coded GaussianDistribution(...). Calling either operation on a subclass therefore silently discarded the concrete type, unlike the subclass-preserving operation contract used by other distribution representations.

Fix

Construct same-dimensional operation results through type(self) in:

• GaussianDistribution.multiply()
• GaussianDistribution.convolve()

The Gaussian formulas and numerical behavior are unchanged. marginalize_out() is intentionally left unchanged because it changes dimensionality and subclasses may have dimension-specific semantics.

Regression coverage

Adds a minimal derived Gaussian and verifies that both operations preserve the left-hand concrete subclass.

Scope

• production diff: 2 additions / 2 deletions
• one focused 30-line regression test
• refreshed against the current main tip before PR creation
• no overlap found with the existing open Gaussian/subclass PR queue

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no		no	4.82s
✅ JSON	prettier	7	0	0		0	0.46s
✅ JSON	v8r	7		0		0	5.48s
✅ MARKDOWN	markdownlint	68	0	0		0	1.44s
✅ MARKDOWN	markdown-table-formatter	68	0	0		0	0.29s
✅ PYTHON	black	2006	22	0		0	45.88s
✅ PYTHON	isort	2006	38	0		0	2.02s
✅ REPOSITORY	betterleaks	yes		no		no	1.04s
✅ REPOSITORY	checkov	yes		no		no	25.26s
✅ REPOSITORY	git_diff	yes		no		no	0.12s
✅ REPOSITORY	secretlint	yes		no		no	72.7s
✅ REPOSITORY	syft	yes		no		no	2.02s
✅ REPOSITORY	trivy-sbom	yes		no		no	1.88s
✅ YAML	prettier	11	0	0		0	0.39s
✅ YAML	v8r	11		0		0	7.82s
✅ YAML	yamllint	11		0		0	0.59s

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