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Fan Control
FanController.swift owns fan modes: Smart, System/Silent, Balanced, Performance, Max, Manual, Custom, and Automatic/System restoration.
Managed modes require the helper because they write fan targets. Monitoring itself does not. Smart mode blends the hottest CPU/GPU reading with system power draw. Balanced and Performance pin fans near fixed percentages of maximum. Manual writes a fixed RPM. Custom follows a persisted curve.
The UI should always explain who owns the fan curve: macOS firmware or Core-Monitor. If Core-Monitor owns it, quitting or switching to automatic should hand control back to the system best-effort.
Fan behavior can lag visibly on Apple Silicon. The guide copy intentionally warns users that a write can succeed before RPM changes are immediately obvious.
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