phase 6: scene flow — Cradle, Death, Fractal scenes + run integration

- Add CradleScene (Spore Cradle): school selection UI with spore particles
- Add DeathScene: body decomposes into real elements with labels
- Add FractalScene: WebGL Mandelbrot/Julia shader + canvas fallback
- Integrate RunState into GameScene: phase management, escalation, crisis
- Give starting kit from chosen school on run start
- Player death triggers DeathScene → FractalScene → CradleScene loop
- Track element/creature discoveries during gameplay
- Chemical Plague crisis: tinted overlay, player damage, neutralization
- BootScene loads meta from IndexedDB, goes to CradleScene
- Update version to v0.6.0

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

src/config.ts

@@ -1,7 +1,10 @@
 import Phaser from 'phaser';
 import { BootScene } from './scenes/BootScene';
+import { CradleScene } from './scenes/CradleScene';
 import { GameScene } from './scenes/GameScene';
 import { UIScene } from './scenes/UIScene';
+import { DeathScene } from './scenes/DeathScene';
+import { FractalScene } from './scenes/FractalScene';
 
 export const GAME_WIDTH = 1280;
 export const GAME_HEIGHT = 720;
@@ -12,7 +15,7 @@ export const gameConfig: Phaser.Types.Core.GameConfig = {
   height: GAME_HEIGHT,
   backgroundColor: '#0a0a0a',
   parent: document.body,
-  scene: [BootScene, GameScene, UIScene],
+  scene: [BootScene, CradleScene, GameScene, UIScene, DeathScene, FractalScene],
   physics: {
     default: 'arcade',
     arcade: {