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/ws2812_led.h

@@ -0,0 +1,19 @@
+#ifndef WS2812_LED_H
+#define WS2812_LED_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void ws2812_init(unsigned int pin, unsigned int num_leds);
+void ws2812_set_rgb(const uint8_t *rgb, unsigned int count);
+void ws2812_fill(uint8_t r, uint8_t g, uint8_t b);
+void ws2812_show(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif