Add IsoPacketDescriptor, UrbRequest, and UrbResponse types to the
protocol layer. Rewrite handle_urb_loop to a concurrent architecture
with pipelining for improved throughput. Replace interfaces vec with
InterfaceState to track alternate settings.
Implement isochronous transfer support in the nusb host handler with
structured ISO packet descriptor parsing and serialization. Switch to
ISO-capable nusb fork. Add IsoLoopbackHandler test fixture and ISO
transfer tests.
Fix host device passthrough: detach kernel drivers before claiming
interfaces, use real EP0 max packet size, forward SET_CONFIGURATION
to device, map nusb Speed enum to Linux kernel values, and use
extend_from_slice for OUT transfer buffers.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Davíð Steinn Geirsson
f7236deba9