Added systemd oom handling and tests

[mishushakov]

Note

Medium Risk
Changes the template’s startup/process supervision to rely on systemd for restarting Jupyter and the uvicorn server, which can affect sandbox boot and recovery behavior. Adds kill/restart integration tests that may be timing-sensitive in CI.

Overview
Switches the non-docker template to run Jupyter and the code-interpreter API as systemd services with Restart=on-failure, service dependency wiring, and a shared Jupyter readiness pre-check via the new jupyter-healthcheck.sh.

Updates template.py to install the new unit files and start via systemctl (while keeping the docker path using start-up.sh), and adds JS + Python (sync/async) tests that kill -9 Jupyter or uvicorn and assert the /health endpoint and code execution recover after restart.

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[jakubno]

We should probably set StartLimitBurst

Systemd's default rate limit is 5 starts in 10 seconds. A crash loop exhausts this and puts the unit in failed state permanently with no self-recovery.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[jakubno]

one nit JUPYTER_CONFIG_PATH can be defined only for Docker in template.py