arora-hal

The hardware abstraction layer of Arora: a device's sensors and actuators presented as typed state.

A Hal describes the device (HalDescription: model family, hardware and software versions), exposes its live values by key (read/read_all/write), and streams hardware-initiated updates (updates). HalAssets adds the device's 3D model (model_glb) so a remote can render what it is controlling.

The runtime drains HAL updates into the shared blackboard each step and flushes state changes back — behaviors never talk to hardware directly. FakeHal is an in-memory implementation for tests and hardware-less runs.

Part of the device runtime interfaces, with arora-bridge and arora-behavior.