USB driver stack: xHCI transfers, HID keyboard/mouse, mass storage
Flesh out the xHCI host-controller driver into a full transfer engine and build the three USB class drivers on top, all verified end to end under QEMU. - xHCI engine (usb-xhci-library.zig): controller reset, command/event rings with cycle-bit bookkeeping (gated on a No-Op-command proof), device slots, Address Device, control transfers, full chapter-9 enumeration, Configure Endpoint, and interrupt/bulk transfers. Each interface is device_registered with its (class,subclass,protocol) identity, unique per (port,interface). - Bus<->class transfer protocol (usb-transfer-protocol.zig + runtime.usb): open / control / interrupt-subscribe (async report pump on a poll timer) / bulk-by- physical-address, so sector data never crosses the 256-byte IPC limit. - USB HID keyboard + mouse (usb-hid/): decode boot-protocol reports and publish to the input service. A USB usage is already the input protocol's keycode. - USB mass storage (usb-storage/): Bulk-Only Transport + transparent SCSI, serving a block device under the new .block service id (block-protocol). - device-manager matches USB interfaces to class drivers (usbDriverForIdentity). - usb-abi / usb-ids made importable modules; add HID and mass-storage class requests, packTriple, and a usb_device DeviceClass. - Fix test/qemu_test.py on macOS: the QMP unix-socket path was built from the deep worktree path and exceeded the 104-byte sun_path limit, so QEMU exited before booting. It now lives under a short temp path. Tests: usb-report, usb-hid, usb-storage pass under python3 test/qemu_test.py; host units (usb-abi, usb-ids, hid-report, bulk-only-transport, scsi) green.
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Daniel Samson