Monitor Control (external DDC)

macOS. FeatureMonitorControl owns DDC display contracts/backend, display controller state/read/write orchestration, CoreAudio output, write coalescing, HUD/menu/settings SwiftUI primitives, startup participants, display-selection/status/settings presentation, selected-display persistence helper, focused-display geometry resolution, media-key activation policy, event tap/parser/action routing, display volume policy, media-key permission presentation/lifecycle policy, the F3/F4 function-key remap (parser, key mapping, activation and per-source consumption policy, event-tap health policy, keyboard-backlight routing seam), and the display-environment/Accessibility-request provider contracts. Settings and menu-bar placement use the shared UIContribution seam with their existing IDs. The app keeps feature/defaults value reads, build-flavor injection, the concrete settings key, notification observers, and thin AppKit screen/mouse plus PermissionManager adapters. DDC/CI brightness over I2C needs no permission; media-key routing (Outdoor only) uses a CGEvent .defaultTap gated on Accessibility (AXIsProcessTrusted). The package-71 F3/F4 remap (Mission Control → KEYBOARD BACKLIGHT down, Spotlight → backlight up) shares that one tap and grant, is Outdoor/Beta/Alpha only, and defaults OFF — the documented exception to the default-ON convention, because enabling it consumes two system keys. It targeted screen brightness until Phil's 2026-08-09 live test; the effect now crosses to FeatureKeyboardBacklight through MonitorKeyboardBacklightControlling, conformed by the app so neither feature package depends on the other, and its Settings toggle moved to the Keyboard Backlight row. Both key sources gate consumption independently, so either toggle being off leaves its keys untouched.

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