Lets a session hand a probe back (frees its USB handle) without opening
another, e.g. to flash two FPGAs on different probes in turn:
jtag_close, then jtag_open the next one and jtag_autoinit. Mirrors the
DeInit teardown jtagcore_loaddriver already does when switching drivers.
Also fix the help printer: no-arg commands (whose params slot is "")
printed an empty body because "" was treated as the terminator. Params
are now optional and the description always shows.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
François
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