DragonFly dfbsd 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026 (baseline)
                       #1: Fri Oct  2 15:25:39 UTC 2026 (fix-validated build)
QEMU: qemu-system-x86_64 -enable-kvm -m 4096 -smp 6 + -device usb-ehci,id=ehci0 -device usb-mouse,bus=ehci0.0
USB: ugen0.2 <QEMU QEMU USB Mouse> at usbus0 (EHCI, HIGH speed)
     /dev/usb/0.2.0 (control endpoint node, used for USB_FS_* ioctls)
unpriv user: maxx uid=1001 (NOT in operator); /dev/usb/0.2.* and
     /dev/usbctl chmod 0666 by the rig (the "libusb-accessible" model;
     stock DragonFly ships these nodes 0600 root:operator)
rig proven repeatedly this pass (DF-5287/DF-5288 used the same device)