Add triple-tap lights-off and fix LED pin to D5

- Triple tap turns off LEDs; any subsequent tap or hold resumes the current show
- Change LED_DATA_PIN default from 6 to 5 across config, docs, and wiring diagram
- Fix Makefile upload to pass --input-dir so it uses the pre-built binary

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

README.md

@@ -26,10 +26,11 @@ SPDX-License-Identifier: BSD-2-Clause
 ### LED strip
 
 ```
-Arduino                 WS2812B strip
-───────                 ─────────────
-GND ──────────────────── GND
-D6  ──── [470Ω] ──────── DIN (data in)
+Arduino                 WS2812B strip wire colors
+───────                 ──────────────────────────
+5V  ──────────────────── red   (VCC)
+GND ──────────────────── white (GND)
+D5  ──── [470Ω] ──────── green (DIN — data in)
 ```
 
 Power the strip separately — see the power warning below.
@@ -51,6 +52,7 @@ Uses the internal pull-up resistor. No external resistor needed. Pin 2 can be ch
 |-------|--------|
 | 1 tap | Next show |
 | 2 taps | Previous show |
+| 3 taps | Lights off (any tap or hold resumes) |
 | Hold (~0.8s) | Reset to show 0 (blue breath) |
 
 ### Power warning — read this
@@ -80,7 +82,7 @@ Arduino IDE: **Sketch → Include Library → Manage Libraries**, then install b
 ### 2. Configure your hardware
 
 Edit `arduino/cosplay_lights/config.h`:
-- `LED_DATA_PIN` — pin connected to the strip's DIN (default: 6)
+- `LED_DATA_PIN` — pin connected to the strip's DIN (default: 5)
 - `BUTTON_PIN` — pin the button is wired to (default: 2)
 - `NUM_LEDS` — total LED count on your strip (default: 60)
 - `MAX_BRIGHTNESS` — global brightness cap (default: 150)