Fix backend autodiff and PyTorch contracts

[FlorianPfaff]

Summary

• fix JAX autodiff backend behavior
• tighten PyTorch backend contract handling for linspace and apply-along-axis
• add backend contract coverage

Validation

• python -m py_compile src\pyrecest\_backend\pytorch\__init__.py src\pyrecest\_backend\jax\autodiff.py tests\backend_support\test_pytorch_apply_along_axis_contract.py tests\backend_support\test_pytorch_linspace_contract.py tests\test_jax_autodiff_backend.py
• git diff --check

Did not run tests per request.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	63.98s
✅ JSON	prettier	7	0	0	0	1.32s
✅ JSON	v8r	7		0	0	4.8s
✅ MARKDOWN	markdownlint	68	0	0	0	1.82s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.65s
✅ PYTHON	black	820	1	0	0	50.11s
✅ PYTHON	isort	820	1	0	0	3.82s
✅ REPOSITORY	checkov	yes		no	no	47.68s
✅ REPOSITORY	gitleaks	yes		no	no	13.77s
✅ REPOSITORY	git_diff	yes		no	no	0.12s
✅ REPOSITORY	secretlint	yes		no	no	25.53s
✅ REPOSITORY	syft	yes		no	no	2.11s
✅ REPOSITORY	trivy-sbom	yes		no	no	6.92s
✅ REPOSITORY	trufflehog	yes		no	no	25.6s
✅ YAML	prettier	11	0	0	0	0.77s
✅ YAML	v8r	11		0	0	12.64s
✅ YAML	yamllint	11		0	0	0.6s

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