Boolean accessibility toggles shared by the CLI, the HTTP API
(/api/device/<udid>/accessibility/<commandName>), and the web client.
They have no simctl ui verb — the CLI writes defaultsKey in the
simulator's com.apple.Accessibility preferences domain.
Screen-edge a touch begins from, for edge-swipe gestures (e.g. swipe up from
the bottom for Home). value is the integer sent in the hid_input
WebSocket payload and maps to the helper's HIDInput.TouchEdge.
