Add an opaque xone_dongle session handle to the C ABI bridge:
xone_open() probes, resets, and loads the firmware (path optional),
and xone_pid/xone_chip_id/xone_mac_address/xone_firmware_build return
debug info for the open session. chip captures the firmware build
string from the image header during load.
The Swift app opens a session when the dongle appears and shows PID,
chip ID, MAC address, and firmware build string in a debug section.
Co-Authored-By: qwen3.8-27b@q2_k_xl: added C API session handle and debug UI
portersky
4f5f16e43f