Stub Digilent JTAG-SMT backend, off by default. Wiring only: option, conditional sources, dl link, drivers_list registration. Detect() returns 0 for now; dlopen + real implementation in follow-up commits.
Stub Digilent JTAG-SMT backend, off by default. Wiring only: option, conditional sources, dl link, drivers_list registration. Detect() returns 0 for now; dlopen + real implementation in follow-up commits.