Fix runtime edge cases

[FlorianPfaff]

Summary

• harden PyTorch backend random edge-case behavior
• tighten CLI and diagnostics runtime handling
• add regression coverage for the fixed edge cases

Verification

• git diff --check
• conflict-marker scan
• python -m py_compile src\pyrecest\_backend\pytorch\random.py src\pyrecest\cli.py src\pyrecest\diagnostics.py tests\test_cli.py tests\test_diagnostics.py tests\test_pytorch_backend.py

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	34.75s
✅ PYTHON	black	2	0	0	0	1.8s
✅ PYTHON	isort	2	0	0	0	0.44s
✅ REPOSITORY	checkov	yes		no	no	32.07s
✅ REPOSITORY	gitleaks	yes		no	no	17.48s
✅ REPOSITORY	git_diff	yes		no	no	0.05s
✅ REPOSITORY	secretlint	yes		no	no	13.25s
✅ REPOSITORY	syft	yes		no	no	2.16s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.69s
✅ REPOSITORY	trufflehog	yes		no	no	23.93s

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[github-actions]

Test Results

    10 files  ± 0      10 suites  ±0   2h 32m 38s ⏱️ - 5m 30s
 2 147 tests + 1   2 143 ✅ +1      4 💤 ±0  0 ❌ ±0 
21 901 runs  +10  18 197 ✅ +3  3 704 💤 +7  0 ❌ ±0 

Results for commit 9c5311f. ± Comparison against base commit 2e7cda3.

♻️ This comment has been updated with latest results.