Adds converter/simulate.py which renders the LED strip color live in the
terminal using ANSI 24-bit color, running the same step playback logic as
the Arduino firmware (blending, step timing, SHOW_LOOP/SHOW_SINGLE mode).
Keyboard controls mirror the physical button. Also adds 'make simulate'.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
