PolyCity v1.0 — full-featured 3D city-builder (Three.js + Vite)

- Procedural island maps, RCI zoning, demand-driven growth
- City-wide power grid with brownouts; wind coastal bonus
- Land value, upgrades, services, pollution, fires & fire spread
- Budget/taxes, happiness, milestones, quest onboarding
- Traffic agents, day/night cycle, adaptive render scale
- Saves: autosave + 3 slots + JSON export/import
- PWA (offline), GitHub Pages/Netlify deploy configs
- Tests: 40-assertion engine suite + headless E2E

public/icon-maskable.svg

@@ -0,0 +1,6 @@
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+  <rect x="42" y="38" width="8" height="14" fill="#ffb454"/>
+</svg>