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test/hil: replace PCI reset with root-port VBUS cycle for D-state recovery pci-reset was documented as an FLR, but no controller on either rig has FLR, so it issued a PCIe secondary bus reset on a live, driver-bound xHCI -- halting the card until the PVE host was power-cycled, and returning success so the caller could not tell. It destroyed the ci controller twice. Replace it with root-cycle, which cuts VBUS at the xHCI root port and touches only the root hub, so it never takes the per-device lock the wedged ioctl holds. uhubctl needs -S, or its sysfs backend disconnects the child before cutting power and blocks on that same lock. Success is proven by the device's sysfs directory inode changing: node existence proves nothing, and devnum is reused once the per-bus map wraps. usbtest.py's hang path invokes it, then confirms via /proc that nothing still holds the device node. Skill scripts now run from the repo; the drifted /usr/local/sbin copies are deleted.