Initial implementation of HeisserDraht buzz wire game

ESP32-C3 based hot wire game with WS2812B LED effects,
SSD1306 OLED display, debounced touch detection, and
full game state machine (IDLE → COUNTDOWN → PLAYING → GAME_OVER).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

led_effects.h

@@ -0,0 +1,11 @@
+#ifndef LED_EFFECTS_H
+#define LED_EFFECTS_H
+
+#include <Arduino.h>
+
+void ledsInit();
+void ledsUpdate();              // Called every loop, dispatches based on game state
+void ledsTouchFlash();          // Blocking 3x red blink (~300ms)
+void ledsSetBrightness(uint8_t b);
+
+#endif // LED_EFFECTS_H