//! Long-running device sessions.
//!
//! Each session holds one HID++ channel open for one device, diverts the
//! controls it needs, streams events until stopped, and restores the device's
//! native behavior on the way out: [`gesture`] and [`keyboard`] capture
//! control presses for the agent to dispatch, [`host_switch`] follows a
//! keyboard's host keys to switch its linked pointing devices.