Seedbox v0.1 + firmware, generic kit/synth, ROOT/SCALE pages

First commit of the repo. Contents beyond the v0.1 simulator and layout:

- Full Pico 2 W firmware (firmware/app, drivers, engine port, host test).
- BANK page and 404 mode A/B removed; learned pads play exactly what was learned.
- 404/MiniFreak renamed to KIT/SYNTH throughout (jacks, code, sim, docs,
  layout labels; wiring rebuilt).
- ROLL returns to page select after a re-roll; a freshly learned track turns on.
- LCD contrast 66.
- ROOT and SCALE pages: 21 scales, AUTO = the seed picks; global and sticky.

Intended music change: the scale table grew from 8 to 21 and AUTO picks from
all of them, so every seed's scale changed. Vectors regenerated with
npm run vectors, plus new key-override cases. Flash record is now version 2.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/hardware/drill-list.csv

@@ -0,0 +1,22 @@
+where,part,x_mm,y_mm,hole
+"Lid","Screen wire hole (under the header)","11","28","Ø 8"
+"Lid","Encoder","15.5","61.5","Ø 7"
+"Lid","KICK","83.5","20","Ø 12"
+"Lid","KICK 2","101.2","20","Ø 12"
+"Lid","SNARE","118.8","20","Ø 12"
+"Lid","RUN toggle","136.5","20","Ø 6"
+"Lid","HAT","83.5","40","Ø 12"
+"Lid","HAT 16","101.2","40","Ø 12"
+"Lid","PERC","118.8","40","Ø 12"
+"Lid","GHOST","136.5","40","Ø 12"
+"Lid","BASS","83.5","60","Ø 12"
+"Lid","MEL A","101.2","60","Ø 12"
+"Lid","MEL B","118.8","60","Ø 12"
+"Lid","PAD","136.5","60","Ø 12"
+"Lid","ENERGY pot","63","17.3","Ø 7"
+"Lid","DRIFT pot","63","40","Ø 7"
+"Lid","SEED","63","62.7","Ø 16"
+"Back wall","Jack MIDI IN","105","20 down","Ø 6"
+"Back wall","Jack OUT · KIT","121","20 down","Ø 6"
+"Back wall","Jack OUT · SYNTH","137","20 down","Ø 6"
+"Back wall","USB slot (Pico port)","44","16 up from inside floor","12 × 8 slot"