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/svg/encoder-pins.svg

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="enc" viewBox="0 0 300 80" role="img" aria-label="Encoder module pins" xmlns="http://www.w3.org/2000/svg" style="background:#F6F7F9"><rect x="72" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="78" y1="26" x2="78" y2="52" stroke="#D7263D" stroke-width="4" stroke-linecap="round"></line><text x="78" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" fill="#18202A">VCC</text><text x="78" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">AB4</text><rect x="108" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="114" y1="26" x2="114" y2="52" stroke="#1E1E1E" stroke-width="4" stroke-linecap="round"></line><text x="114" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" fill="#18202A">GND</text><text x="114" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">AA4</text><rect x="144" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="150" y1="26" x2="150" y2="52" stroke="#2E9E5B" stroke-width="4" stroke-linecap="round"></line><text x="150" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" fill="#18202A">SW</text><text x="150" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">P2</text><rect x="180" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="186" y1="26" x2="186" y2="52" stroke="#2E9E5B" stroke-width="4" stroke-linecap="round"></line><text x="186" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" fill="#18202A">SIB</text><text x="186" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">O2</text><rect x="216" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="222" y1="26" x2="222" y2="52" stroke="#2E9E5B" stroke-width="4" stroke-linecap="round"></line><text x="222" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" fill="#18202A">SIA</text><text x="222" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">N2</text></svg>

docs/hardware/svg/lcd-pins.svg

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="lcd" viewBox="0 0 300 92" role="img" aria-label="LCD header pins" xmlns="http://www.w3.org/2000/svg" style="background:#F6F7F9"><rect x="30.25" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="36.25" y1="26" x2="36.25" y2="52" stroke="#D7263D" stroke-width="4" stroke-linecap="round"></line><text x="36.25" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">1 VCC</text><text x="36.25" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">AB23</text><rect x="62.75" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="68.75" y1="26" x2="68.75" y2="52" stroke="#1E1E1E" stroke-width="4" stroke-linecap="round"></line><text x="68.75" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">2 GND</text><text x="68.75" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">AA23</text><rect x="95.25" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="101.25" y1="26" x2="101.25" y2="52" stroke="#2F6FDB" stroke-width="4" stroke-linecap="round"></line><text x="101.25" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">3 SCE</text><text x="101.25" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">S27</text><rect x="127.75" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="133.75" y1="26" x2="133.75" y2="52" stroke="#2F6FDB" stroke-width="4" stroke-linecap="round"></line><text x="133.75" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">4 RST</text><text x="133.75" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">N27</text><rect x="160.25" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="166.25" y1="26" x2="166.25" y2="52" stroke="#2F6FDB" stroke-width="4" stroke-linecap="round"></line><text x="166.25" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">5 D/C</text><text x="166.25" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">O27</text><rect x="192.75" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="198.75" y1="26" x2="198.75" y2="52" stroke="#2F6FDB" stroke-width="4" stroke-linecap="round"></line><text x="198.75" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">6 DN</text><text x="198.75" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">P27</text><rect x="225.25" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="231.25" y1="26" x2="231.25" y2="52" stroke="#2F6FDB" stroke-width="4" stroke-linecap="round"></line><text x="231.25" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">7 SCLK</text><text x="231.25" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">Q27</text><rect x="257.75" y="14" width="12" height="12" fill="#111" stroke="#D4AF37" stroke-width="1.5"></rect><line x1="263.75" y1="26" x2="263.75" y2="52" stroke="#D7263D" stroke-width="4" stroke-linecap="round"></line><text x="263.75" y="10" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="8" fill="#18202A">8 LED</text><text x="263.75" y="68" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" font-weight="700" fill="#18202A">AB22</text></svg>

docs/hardware/svg/pots-seed-run.svg

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="misc" viewBox="0 0 300 150" role="img" aria-label="Pots, SEED and RUN wiring" xmlns="http://www.w3.org/2000/svg" style="background:#F6F7F9"><circle cx="45" cy="42" r="20" fill="#2C3238"></circle><text x="45" y="14" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" fill="#18202A">ENERGY</text><rect x="30.5" y="62" width="5" height="12" fill="#C9CFD5"></rect><line x1="33" y1="74" x2="33" y2="96" stroke="#1E1E1E" stroke-width="4" stroke-linecap="round"></line><text x="33" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">H27</text><rect x="42.5" y="62" width="5" height="12" fill="#C9CFD5"></rect><line x1="45" y1="74" x2="45" y2="96" stroke="#2F6FDB" stroke-width="4" stroke-linecap="round"></line><text x="45" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">J27</text><rect x="54.5" y="62" width="5" height="12" fill="#C9CFD5"></rect><line x1="57" y1="74" x2="57" y2="96" stroke="#D7263D" stroke-width="4" stroke-linecap="round"></line><text x="57" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">AB25</text><circle cx="115" cy="42" r="20" fill="#2C3238"></circle><text x="115" y="14" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" fill="#18202A">DRIFT</text><rect x="100.5" y="62" width="5" height="12" fill="#C9CFD5"></rect><line x1="103" y1="74" x2="103" y2="96" stroke="#1E1E1E" stroke-width="4" stroke-linecap="round"></line><text x="103" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">H27</text><rect x="112.5" y="62" width="5" height="12" fill="#C9CFD5"></rect><line x1="115" y1="74" x2="115" y2="96" stroke="#2F6FDB" stroke-width="4" stroke-linecap="round"></line><text x="115" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">I27</text><rect x="124.5" y="62" width="5" height="12" fill="#C9CFD5"></rect><line x1="127" y1="74" x2="127" y2="96" stroke="#D7263D" stroke-width="4" stroke-linecap="round"></line><text x="127" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">AB25</text><circle cx="190" cy="42" r="16" fill="#2C3238"></circle><text x="190" y="14" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" fill="#18202A">SEED</text><line x1="183" y1="58" x2="183" y2="96" stroke="#D9A600" stroke-width="4" stroke-linecap="round"></line><text x="183" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">Q2</text><line x1="197" y1="58" x2="197" y2="96" stroke="#1E1E1E" stroke-width="4" stroke-linecap="round"></line><text x="197" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">AA6</text><rect x="240" y="30" width="34" height="24" rx="3" fill="#2C3238"></rect><text x="257" y="14" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="10" fill="#18202A">RUN</text><rect x="243.5" y="54" width="5" height="10" fill="#C9CFD5"></rect><rect x="254.5" y="54" width="5" height="10" fill="#C9CFD5"></rect><line x1="257" y1="64" x2="257" y2="96" stroke="#D9A600" stroke-width="4" stroke-linecap="round"></line><text x="257" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">S2</text><rect x="265.5" y="54" width="5" height="10" fill="#C9CFD5"></rect><line x1="268" y1="64" x2="268" y2="96" stroke="#1E1E1E" stroke-width="4" stroke-linecap="round"></line><text x="268" y="108" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" font-weight="700" fill="#18202A">AA6</text><text x="150" y="138" text-anchor="middle" font-family="'Martian Mono', ui-monospace, Menlo, Consolas, monospace" font-size="9" fill="#566271">lugs facing down, seen from the front</text></svg>