Description:
After upgrading NemoClaw from v0.0.11 to v0.0.15 via curl | bash, the sandbox still use the old sandbox image: OpenClaw 2026.3.11, not using the 2026.4.2.
The NemoClaw CLI upgrades correctly, but existing sandboxes are not rebuilt or migrated to the new OpenClaw version shipped in v0.0.15 (#1522).

Environment:

• Platform: Brev cloud instance (Shadeform)
• OS: Ubuntu 22.04.5 LTS
• Hardware: Intel Xeon 8462Y+ / 14 cores, 98GB RAM, NVIDIA A100-SXM4-80GB x1
• GPU Driver: 560.35.05
• NemoClaw: v0.0.11 → v0.0.15
• OpenShell: 0.0.26
• OpenClaw: 2026.3.11 (expected 2026.4.2 after upgrade)
• Install method: curl -fsSL https://www.nvidia.com/nemoclaw.sh | bash
• Runtime detected by installer: docker
• Existing sandboxes before upgrade: abc, aaa

Steps to Reproduce:

1. Start with NemoClaw v0.0.11, OpenShell 0.0.26, OpenClaw 2026.3.11
   2. Tips for uing the docker build to downgrade OpenClaw version:

git clone https://github.com/NVIDIA/NemoClaw.git
git checkout v0.0.7
cd NemoClaw
docker build -f Dockerfile.base --build-arg OPENCLAW_VERSION=2026.3.11  -t ghcr.io/nvidia/nemoclaw/sandbox-base:latest .

3. Confirm existing sandbox: nemoclaw abc connect → openclaw --version → OpenClaw 2026.3.11
4. Run: curl -fsSL https://www.nvidia.com/nemoclaw.sh | bash
5. Complete onboard (creates new sandbox abcd)
6. Run: nemoclaw --version → nemoclaw v0.0.15
7. Run: nemoclaw abc connect
8. Run: openclaw --version

Actual:

sandbox@abc:~$ openclaw --version
OpenClaw 2026.3.11 (29dc654)

Old sandbox abc still runs OpenClaw 2026.3.11. Additionally, the base image is also stale:
$ docker run --rm ghcr.io/nvidia/nemoclaw/sandbox-base:latest openclaw --version
OpenClaw 2026.3.11 (29dc654)

Expect:

After upgrading NemoClaw to v0.0.15, the sandbox image should use the new OpenClaw 2026.4.2