Initial commit — Amirine Cosplay Lights

Arduino Uno + WS2812B LED strip controller with a text-based lightshow
system. Shows are defined as .txt files (hex color + fade duration per step),
converted to PROGMEM headers by convert_all.py, and navigated at runtime
via a debounced button (tap/double-tap/hold). BSD 2-Clause license.

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

arduino/cosplay_lights/led_controller.cpp

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: BSD-2-Clause
+#include "led_controller.h"
+
+// Internal LED buffer — FastLED writes to this array, then pushes it to the strip.
+static CRGB leds[NUM_LEDS];
+
+void leds_begin() {
+    FastLED.addLeds<LED_TYPE, LED_DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
+    FastLED.setBrightness(MAX_BRIGHTNESS);
+    FastLED.clear(true);  // clear + show: strip starts fully off
+}
+
+void leds_apply_color(CRGB color) {
+#if ACTIVE_PATTERN == PATTERN_SOLID
+    // All LEDs show the same color.
+    fill_solid(leds, NUM_LEDS, color);
+
+    // To add a new pattern, add a new #define in config.h and a new branch here.
+    // The pattern receives 'leds', 'NUM_LEDS', and the blended 'color' for this frame.
+#endif
+}
+
+void leds_show() {
+    FastLED.show();
+}