feat: Common Lisp notepat — keyboard instrument boots on bare metal
Port notepat core from JS to Common Lisp for AC Native OS:
- Full QWERTY keyboard → chromatic note mapping (2.5 octaves)
- 5 wave types (sine/triangle/sawtooth/square/noise) with Tab cycling
- 32-voice polyphonic ALSA synth with stereo panning
- ALSA mixer auto-unmute + volume max (fixes silent audio)
- Per-note chromatic rainbow colors with trail effects
- Background color lerps to match active notes
- 6x10 bitmap font rendering for status bar
- Optimized fb-copy-scaled using memcpy (was per-pixel loops)
- Pixel scale targets ~200px wide (bigger pixels)
- Octave control (1-9 / arrows), ESC triple-press quit
- Progress log at fedac/native/cl/PROGRESS.md
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>