Fix PyTorch random choice backend behavior

[FlorianPfaff]

Summary

• support tuple-axis PyTorch product reductions
• extend PyTorch random choice to support integer populations and axis selection
• add backend contract coverage for these behaviors

Validation

• git diff --check

Tests were not run per request.

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	46.16s
✅ JSON	prettier	7	0	0	0	0.98s
✅ JSON	v8r	7		0	0	4.22s
⚠️ MARKDOWN	markdownlint	66	0	1	0	1.68s
✅ MARKDOWN	markdown-table-formatter	66	0	0	0	0.72s
✅ PYTHON	black	755	6	0	0	34.21s
✅ PYTHON	isort	755	6	0	0	2.24s
✅ REPOSITORY	checkov	yes		no	no	43.46s
✅ REPOSITORY	gitleaks	yes		no	no	17.02s
✅ REPOSITORY	git_diff	yes		no	no	0.1s
✅ REPOSITORY	secretlint	yes		no	no	22.6s
✅ REPOSITORY	syft	yes		no	no	4.6s
✅ REPOSITORY	trivy-sbom	yes		no	no	4.92s
✅ REPOSITORY	trufflehog	yes		no	no	22.33s
✅ YAML	prettier	10	0	0	0	0.68s
✅ YAML	v8r	10		0	0	10.61s
✅ YAML	yamllint	10		0	0	0.49s

Detailed Issues

⚠️ MARKDOWN / markdownlint - 1 error

.github/pull_request_template.md:1 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "## Summary"]

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