Docs: WEMOS D1 R1 (ESP8266) instead of ESP32

The reference build now uses a D1 R1. The example config targets
esp8266/d1 and sends on GPIO2 (header pin D9, UART1 TX), which leaves
UART0 free for the USB logger. The README wiring and signal-level notes
are updated to match.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -48,7 +48,7 @@ server, so `type: git` with a URL, not `github://`). The layout must stay
   to line 2 and from the end of line 2 back home, and nothing scrolls. The
   buffered text API depends on this; the scroll modes are only for raw writes.
 - The RXD input is RS-232. The reference build uses a MAX3232 (no inversion
-  in config); a directly wired ESP32 pin needs `inverted: true` on the UART TX
+  in config); a directly wired ESP8266 pin needs `inverted: true` on the UART TX
   pin. Baud rate and parity come from the board's jumpers, so they are not
   validated by the component.
 - User characters: up to 4, codes 0x20–0x7E. Each is 5 column bytes, bit 6 =