- Denkovi (FT245 D2XX) now selectable as 4 or 8 relays (a 4-relay board just uses
the low nibble); NewDenkovi takes a count, driven by the device's Channels.
- New 'usbrelay' backend: cheap CH340/LCUS USB-serial boards over a COM port
using the common A0 protocol ([0xA0][relay][state][checksum]); write-only, so
Status is a shadow. Channel count configurable (1/2/4/8/16).
- StationDevice gains Channels; deviceRelayCount() drives label/relay counts for
the variable-size types. Device editor: channel selector + COM-port picker
(usbrelay) / FTDI-serial (denkovi).
Both untested on hardware; the A0 command set / Denkovi bit order may need a tweak
after a live test.