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>

test/render.js

@@ -0,0 +1,14 @@
+/* Renders one case to rows [tick,lane,voice,vel,len,track] per bar, plus a whole-case checksum. */
+var E=require('../sim/engine.js');
+function hex(n){ return '0x'+('00000000'+(n>>>0).toString(16).toUpperCase()).slice(-8); }
+function renderCase(c,bars){
+  var st={seed:c.seed>>>0,salts:c.salts.slice()}, all=[], out=[];
+  for(var b=0;b<bars;b++){
+    var r=E.renderBar(st,{gen:c.gen,energy:c.energy,drift:c.drift,fill:c.fillBars.indexOf(b)>=0,scale:c.scale,root:c.root},b);
+    var ev=r.events.map(function(e){ return [e.t,e.lane,e.v,e.vel,e.len,e.tr]; });
+    out.push({bar:b,sec:r.sec,fill:!!r.fill,barTicks:r.barTicks,events:ev}); all=all.concat(ev);
+  }
+  return {bars:out,checksum:hex(E.checksum(all))};
+}
+function caseId(c){ return hex(c.seed).slice(2)+'_s'+c.salts.join('-')+'_g'+c.gen+'_e'+c.energy+'_d'+c.drift+(c.fillBars.length?'_f'+c.fillBars.join('-'):'')+(c.scale>=0?'_sc'+c.scale:'')+(c.root>=0?'_r'+c.root:''); }
+module.exports={renderCase:renderCase,caseId:caseId,hex:hex};