Enhance module selection process by validating vermagic against the running kernel. Add detailed error messages with suggestions for manual path overrides or rebuilding for the current kernel. Ensure robust fallback behavior and improve user guidance.
Replace legacy gpio_to_desc() with GPIO descriptor resolution by chip label
and hardware number, ensuring compatibility with kernels using non-zero
gpiochip bases. Added `selftest.sh` for non-persistent module testing, which
performs a hardware self-test and verifies wiring before connecting the real
bus. Included a detailed README.md documenting the self-test process.
