Implement tiled multiplayer city simulation and scaling stages

tools/demo.ts

@@ -0,0 +1,15 @@
+import { readFile,access } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import { generateWorldSync } from '../src/gen/generate';
+import { exportCity } from './export/index';
+const output=resolve(process.argv[2] || 'public/cities/balzers-demo');
+let ready=false;
+try {await access(resolve(output,'manifest.json'));ready=true;} catch(error) {if ((error as NodeJS.ErrnoException).code!=='ENOENT') throw error;}
+if (ready) console.log(`Prepared city already exists: ${output}`);
+else {
+  const data=JSON.parse(await readFile('samples/balzers-2013.json','utf8'));
+  const world=generateWorldSync(data.elements,[47.058,9.492,47.074,9.518],'Бальцерс',1);
+  world.id='balzers-0-2-0';
+  const manifest=await exportCity(world,output);
+  console.log(`${manifest.city.name}: ${manifest.counts.buildings} buildings, ${manifest.tiles.length} tiles → ${output}`);
+}