Keep the machine awake during preset creation - #4205
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Fixes #4202. A preset creation session left unattended on a laptop stalls: macOS idles to sleep, the agent's streaming response dies, and every maintenance wake costs a retry. In one session a trial that takes ~25 minutes attended took 2h40m.
caffeinate -i -w <pid>inhibitor for the duration of preset creation on macOS, tied to the dstack process so neither a crash nor aSIGKILLcan leave the machine awake; every other platform is a no-op.Verified by hand rather than with unit tests, which here would have been almost entirely monkeypatching. Blocks idle sleep only, so a closed laptop lid still sleeps.
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