RISCy Logger v1.5 - minimal web-read build (split from the full firmware)

Serial trimmed to l:d/l:v/l:w; settings block, gestures, diagnostics, session
timestamps and USB-id customization removed; log always circular; 44 KB log
(base 20); pid.codes USB id 0x1209/0xF1F0; GPL-3.0 + CERN-OHL-S.