Fix JAX dot out handling

[FlorianPfaff]

Summary

• patch the JAX backend facade so backend.dot(..., out=...) accepts NumPy-style output arrays
• keep the raw pyrecest._backend.jax.dot entry point aligned after PyRecEst import
• validate out shape before returning the JAX immutable update result
• add subprocess regression coverage for scalar, vector, raw-backend, and incompatible-shape cases

Bug fixed

Current main defines the JAX backend dot helper as dot(a, b) only. Code using the NumPy-compatible out keyword therefore fails with TypeError under PYRECEST_BACKEND=jax, even though other PyRecEst backend helpers expose NumPy-style output handling.

Testing

• Syntax-checked the changed source and test content locally before committing.
• Added tests/backend_support/test_jax_dot_out_contract.py; full CI should run on GitHub.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	70.62s
✅ JSON	prettier	7	0	0	0	0.95s
✅ JSON	v8r	7		0	0	4.75s
✅ MARKDOWN	markdownlint	68	0	0	0	2.1s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.76s
✅ PYTHON	black	1095	0	0	0	61.49s
✅ PYTHON	isort	1095	0	0	0	5.67s
✅ REPOSITORY	checkov	yes		no	no	47.39s
✅ REPOSITORY	gitleaks	yes		no	no	9.34s
✅ REPOSITORY	git_diff	yes		no	no	0.21s
✅ REPOSITORY	secretlint	yes		no	no	33.13s
✅ REPOSITORY	syft	yes		no	no	4.77s
✅ REPOSITORY	trivy-sbom	yes		no	no	12.27s
✅ REPOSITORY	trufflehog	yes		no	no	21.0s
✅ YAML	prettier	11	0	0	0	0.81s
✅ YAML	v8r	11		0	0	11.4s
✅ YAML	yamllint	11		0	0	0.57s

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