[codex] Fix JAX randint backend

[FlorianPfaff]

Summary

Fix the JAX random backend so random.randint delegates to jax.random.randint instead of jax.random.uniform.

This keeps the function name and backend contract aligned: JAX now returns integer samples for integer random draws, matching the behavior expected from the NumPy/autograd and PyTorch backends.

Root Cause

The JAX _randint helper split the PRNG key correctly, but then called jax.random.uniform, so callers got floating-point samples from random.randint.

Tests

Added tests/test_backend_random.py to check that random.randint returns integer samples with the requested shape and bounds under each backend's existing call signature.

Not run locally because this Codex workspace is read-only and the change was applied through the GitHub connector. The repository's PR CI should run the numpy, pytorch, and jax backend matrix.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	11.86s
✅ JSON	prettier	2	0	0	0	0.45s
✅ JSON	v8r	2		0	0	2.76s
✅ MARKDOWN	markdownlint	2	0	0	0	0.69s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.24s
✅ PYTHON	bandit	383		0	0	5.48s
✅ PYTHON	black	383	1	0	0	7.62s
✅ PYTHON	flake8	383		0	0	2.95s
✅ PYTHON	isort	383	1	0	0	0.72s
✅ PYTHON	mypy	383		0	0	4.97s
✅ PYTHON	pylint	383		0	0	112.72s
✅ PYTHON	ruff	383	1	0	0	0.07s
✅ REPOSITORY	checkov	yes		no	no	22.61s
✅ REPOSITORY	gitleaks	yes		no	no	7.4s
✅ REPOSITORY	git_diff	yes		no	no	0.19s
✅ REPOSITORY	secretlint	yes		no	no	6.92s
✅ REPOSITORY	syft	yes		no	no	4.72s
✅ REPOSITORY	trivy-sbom	yes		no	no	1.98s
✅ REPOSITORY	trufflehog	yes		no	no	18.77s
✅ YAML	prettier	4	0	0	0	0.45s
✅ YAML	v8r	4		0	0	4.57s
✅ YAML	yamllint	4		0	0	0.37s

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[github-actions]

Test Results

    12 files  ± 0      12 suites  ±0   4h 55m 35s ⏱️ + 8m 35s
 1 091 tests + 1   1 091 ✅ + 1      0 💤 ±0  0 ❌ ±0 
13 376 runs  +12  10 284 ✅ +12  3 092 💤 ±0  0 ❌ ±0 

Results for commit 083ce16. ± Comparison against base commit f344bab.