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Mock backend: deterministic-ish simulation used for CI and demos (no GPU required).
Device 0 simulates a training run: high util with periodic idle gaps (dataloader /
checkpoint pattern), VRAM climbing toward OOM, temperature chasing util until a thermal
throttle cycle kicks in. Device 1 simulates a desktop/inference box: bursty util and an
ollama process that periodically attaches with a large allocation, then exits.