Add k3s installer, RuntimeClass, and e2e test for the smolvm Kubernetes runtime

[BinSquare]

Adds deploy/ — a version-robust k3s installer that wires the smolvm containerd shim v2 into k3s's embedded containerd, the smolvm RuntimeClass, an example pod, and an end-to-end test that boots a pod as a microVM and checks logs and exec, plus a README documenting the 82/113 critest status and the VM-isolation limits.

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[ghost]

Ready to review this PR? Stage has broken it down into 3 individual chapters for you:

	Title
1	Define the smolvm RuntimeClass and example pod
2	Implement the k3s installer for smolvm
3	Add end-to-end validation and documentation

_{Chapters generated by Stage for commit b5e5cc1 on Jul 15, 2026 6:46am UTC.}