Fix JAX outer NumPy contract

[FlorianPfaff]

Summary

• Patch the JAX backend outer helper from pyrecest.backend_support so it flattens both inputs before forming the outer product, matching NumPy semantics.
• Keep both the active public JAX facade and the raw pyrecest._backend.jax.outer helper on the same contract.
• Add subprocess regression coverage for multidimensional JAX inputs.

Bug fixed

The current JAX backend outer implementation treats multidimensional inputs as batched outer products. NumPy's outer contract flattens both inputs first, so shapes such as (2, 2) and (2, 1) should produce (4, 2), not a batched shape.

Testing

• Not run locally in this connector session; the container cannot resolve github.com.
• Added tests/backend_support/test_jax_outer_contract.py for focused CI coverage.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	64.85s
✅ JSON	prettier	7	0	0	0	0.95s
✅ JSON	v8r	7		0	0	4.38s
✅ MARKDOWN	markdownlint	68	0	0	0	2.0s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	1.03s
✅ PYTHON	black	1126	10	0	0	53.83s
✅ PYTHON	isort	1126	15	0	0	3.39s
✅ REPOSITORY	checkov	yes		no	no	42.66s
✅ REPOSITORY	gitleaks	yes		no	no	10.89s
✅ REPOSITORY	git_diff	yes		no	no	0.15s
✅ REPOSITORY	secretlint	yes		no	no	40.87s
✅ REPOSITORY	syft	yes		no	no	3.26s
✅ REPOSITORY	trivy-sbom	yes		no	no	5.56s
✅ REPOSITORY	trufflehog	yes		no	no	16.48s
✅ YAML	prettier	11	0	0	0	0.74s
✅ YAML	v8r	11		0	0	11.12s
✅ YAML	yamllint	11		0	0	0.48s

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