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(#3789)
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.
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Rename usb-target-debug -> target-debug, usb-debug -> usb-kernel-debug,
usb-recover -> usb-kernel-recover (script filenames unchanged), and make all
debug skills/agents decide tool applicability by which end of the link runs
Linux: TinyUSB may run the device or host stack, and its peer may be a Linux
PC, another TinyUSB board, or a Linux gadget (e.g. Raspberry Pi UDC).
- usbmon: exists only when a Linux PC is the link's host
- usb-kernel-debug: either Linux end; allowlist gains dwc3/libcomposite/udc_core
for the gadget side of a Linux peer
- usb-sniffer: the only full-visibility capture when TinyUSB is the host
- target-debug: covers dcd_* and hcd_*/tuh_ debugging; channel choice by topology
- update target-debugger/hil-operator agents, pre-pr, hil-validate.js, and the
USB_RECOVER path constant in test/hil/usbtest.py
- CLAUDE.md: fold the dcd/hcd datasheet cross-check rule into the read-doc line
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