Add multi-panel Pico UDP firmware and Python LED control.

Pico panels get static IPs on 10.1.1.10–14 with per-panel LED counts, Makefile deploy targets, and Python examples for animations, sync tests, and direct Pi SPI control.

Co-authored-by: Cursor <cursoragent@cursor.com>

firmware/panel/board_config.h

@@ -0,0 +1,53 @@
+#ifndef BOARD_CONFIG_H
+#define BOARD_CONFIG_H
+
+/* Matches adapter/code.py — W5500 on SPI1, WS2812 on GP27 */
+
+#define PIN_LED_STATUS 25
+
+#define SPI_PORT spi1
+#define SPI_CLK_MHZ 20
+
+#define PIN_CS 9
+#define PIN_SCK 10
+#define PIN_MOSI 11
+#define PIN_MISO 12
+#define PIN_RST 13
+
+#ifndef PIN_WS2812
+#define PIN_WS2812 27
+#endif
+
+#ifndef NUM_LEDS
+#define NUM_LEDS 405
+#endif
+
+#define LED_RGB_BYTES (NUM_LEDS * 3)
+
+/* W5500 socket assignments */
+#define SOCKET_DHCP 0
+#define SOCKET_UDP 1
+
+/* UDP port (same as CircuitPython adapter) */
+#define UDP_PORT 50007
+
+/* Compile-time panel index for filtered frames (0–4). 255 = accept all. */
+#ifndef PANEL_ID
+#define PANEL_ID 255
+#endif
+
+/* 1 = DHCP, 0 = static IP below */
+#ifndef USE_DHCP
+#define USE_DHCP 0
+#endif
+
+#define STATIC_IP_OCT4 ((PANEL_ID) == 255 ? 19u : (10u + (unsigned)(PANEL_ID)))
+#define STATIC_IP {10, 1, 1, (uint8_t)STATIC_IP_OCT4}
+#define STATIC_SN {255, 255, 255, 0}
+#define STATIC_GW {10, 1, 1, 1}
+#define STATIC_DNS {10, 1, 1, 1}
+
+/* Locally administered; last byte = PANEL_ID (unique per panel 0–4). */
+#define MAC_ADDR {0x02, 0x50, 0x52, 0x54, 0x4C, (uint8_t)PANEL_ID}
+
+#endif