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>

HeisserDraht.ino

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+/*
+ * HeisserDraht - ESP32-C3 Buzz Wire Game
+ *
+ * Hardware:
+ *   - ESP32-C3 (RISC-V)
+ *   - 16x WS2812B LEDs on GPIO 8
+ *   - SSD1306 128x64 OLED on I2C (SDA=4, SCL=5)
+ *   - Wire touch sensor on GPIO 2 (INPUT_PULLUP, touch = GND)
+ *   - Start button on GPIO 3 (INPUT_PULLUP, press = GND)
+ *   - Optional passive buzzer on GPIO 10
+ *
+ * Game flow: IDLE → COUNTDOWN → PLAYING → GAME_OVER → IDLE
+ */
+
+#include "config.h"
+#include "game_logic.h"
+#include "led_effects.h"
+#include "display.h"
+
+void setup() {
+  Serial.begin(115200);
+  delay(500);
+  Serial.println();
+  Serial.println("=== HEISSER DRAHT " VERSION_STR " ===");
+  Serial.println("[INIT] Starting...");
+
+  // Initialize subsystems
+  gameInit();
+  Serial.println("[INIT] Game logic OK");
+
+  ledsInit();
+  Serial.println("[INIT] LEDs OK");
+
+  displayInit();
+  Serial.println("[INIT] Display OK");
+
+  Serial.println("[INIT] Ready! Press START to begin.");
+}
+
+void loop() {
+  // Check inputs
+  gameCheckStartButton();
+  gameCheckTouch();
+
+  // Update game state
+  gameUpdate();
+
+  // Update outputs
+  ledsUpdate();
+  displayUpdate();
+
+  // Small delay for watchdog
+  delay(LOOP_DELAY_MS);
+}