IMPERIUM ARCANUM — web-based Caesar 3-like city builder with heroes, magic & monsters

- Full classic layer: roads/walkers, 11-tier housing evolution, food chain,
  industry chains, trade routes, taxes/wages, ratings, fires & collapse
- Fantasy layer: heroes (XP/levels/auras), mana & 7 spells, monsters/invasions,
  walls/towers/legions/golems, campaign of 5 scenarios + endless sandbox
- Canvas2D isometric engine with procedural sprites, zero runtime deps
- Save/load slots + autosave, WebAudio synth music/SFX, HUD/menus/minimap
- Tests: headless sim smoke test + Playwright E2E (build/combat/save)

scripts/build-simtest.mjs

@@ -0,0 +1,8 @@
+import pkg from '../node_modules/.pnpm/esbuild@0.21.5/node_modules/esbuild/lib/main.js';
+const { build } = pkg;
+await build({
+  entryPoints: ['scripts/simtest.ts'],
+  bundle: true, format: 'esm', platform: 'node',
+  outfile: '/tmp/simtest.mjs', logLevel: 'warning',
+});
+console.log('bundled ok');