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/manifest.webmanifest

@@ -0,0 +1,15 @@
+{
+  "name": "PolyCity — 3D City Builder",
+  "short_name": "PolyCity",
+  "description": "Zone it, power it, grow it. A full 3D city-builder simulation in your browser.",
+  "start_url": "./",
+  "scope": "./",
+  "display": "fullscreen",
+  "orientation": "any",
+  "background_color": "#0b1020",
+  "theme_color": "#0b1020",
+  "icons": [
+    { "src": "./icon.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "any" },
+    { "src": "./icon-maskable.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "maskable" }
+  ]
+}