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-lock.json

@@ -9,7 +9,8 @@
       "version": "0.1.0",
       "dependencies": {
         "bitecs": "^0.4.0",
-        "phaser": "^3.80.0"
+        "phaser": "^3.80.0",
+        "simplex-noise": "^4.0.3"
       },
       "devDependencies": {
         "happy-dom": "^20.6.1",
@@ -1269,6 +1270,12 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/simplex-noise": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/simplex-noise/-/simplex-noise-4.0.3.tgz",
+      "integrity": "sha512-qSE2I4AngLQG7BXqoZj51jokT4WUXe8mOBrvfOXpci8+6Yu44+/dD5zqDpOx3Ux792eamTd2lLcI8jqFntk/lg==",
+      "license": "MIT"
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",