P0-05: Delete Prototypes/ (move two GlowPanels build READMEs to docs/fabrication/) #183

Part of #175 (audit Phase 0). Evidence: docs/audit/2026-11-09/detail/firmware-prototypes-pipes.md §2.

Why. 14 distinctive TouchTest symbols and 3 ForgeAndFlora symbols have zero hits in ShowControl/ and IIVision/; nothing imports or copies from Prototypes/. ShowControl/TreeHouse/test_forge_and_flora.py tests the production displays/effect.py, not the prototype. Prototypes/GlowPanels/ has no shared code either, but its two build READMEs are the fabrication record of the shipped Mycelium panel (NUM_LEDS=224 matches TreeHouse/settings.json). Prototypes/ is mentioned in no doc. Precedent: Prototypes/FundingCAPTCHA/ was already deleted on 2026-04-30 when it graduated.

Do.

mkdir -p docs/fabrication
git mv Prototypes/GlowPanels/01_SideLit/README.md docs/fabrication/mycelium-panel-01-sidelit.md
git mv Prototypes/GlowPanels/02_BackLit_Frosted/README.md docs/fabrication/mycelium-panel-02-backlit-frosted.md
git rm -r Prototypes

10 files, 1,942 lines removed.

Done when. No Prototypes/ directory; the two fabrication notes live under docs/fabrication/; make test unchanged.