Refresh CUDA example images

[dholt]

Summary

• Refresh stale CUDA/NGC example image tags in airgap docs, Kubernetes GPU examples, virtual setup comments, and Jenkins smoke scripts.
• Align NGC Ready documentation with the existing config.example defaults for CUDA, PyTorch, and TensorFlow containers.
• Remove unresolved merge-conflict markers from docs/airgap/mirror-docker-images.md and update the registry example to registry:3.1.1.

Validation

• git diff --check: PASS
• YAML parse for modified Kubernetes example manifests: PASS
• bash -n for modified shell scripts: PASS
• Changed-file scan for stale conflict markers and old CUDA/registry examples: PASS
• docker manifest inspect for CUDA, PyTorch, TensorFlow, and registry example images: PASS
• Static OS compatibility audit: medium findings reduced from 43 to 31; low findings reduced from 140 to 129
• Public GitHub Actions on final head d4632fe4: PASS
• Public PR-body sanitization: PASS

Notes

• This is a docs/example cleanup. No live cluster job execution is included because no runtime role or playbook behavior is changed.