Phase 3: World generation — procedural tilemap for Catalytic Wastes

- simplex-noise with seeded PRNG (mulberry32) for deterministic generation
- Biome data: 8 tile types (scorched earth, cracked ground, ash sand,
  acid pools, acid shallow, crystals, geysers, mineral veins)
- Elevation noise → base terrain; detail noise → geyser/mineral overlays
- Canvas-based tileset with per-pixel brightness variation
- Phaser tilemap with collision on non-walkable tiles
- Camera: WASD movement, mouse wheel zoom (0.5x–3x), world bounds
- Minimap: 160x160 canvas overview with viewport indicator
- 21 world generation tests passing (95 total)

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -12,7 +12,8 @@
   },
   "dependencies": {
     "bitecs": "^0.4.0",
-    "phaser": "^3.80.0"
+    "phaser": "^3.80.0",
+    "simplex-noise": "^4.0.3"
   },
   "devDependencies": {
     "happy-dom": "^20.6.1",