phase 9: biome expansion — 3 biomes, 40 elements, 119 reactions, 9 species

Expand beyond vertical slice with two new biomes and massive chemistry expansion:

Chemistry: +20 real elements (Li→U), +39 compounds (acids/salts/oxides/organics),
+85 reactions (Haber process, thermite variants, smelting, fermentation, etc.)

Biomes: Kinetic Mountains (physics/mechanics themed) and Verdant Forests
(biology/ecology themed), each with 8 tile types and unique generation rules.

Creatures: 6 new species — Pendulums/Mechanoids/Resonators (mountains),
Symbiotes/Mimics/Spore-bearers (forests). Species filtered by biome.

Infrastructure: CradleScene biome selector UI, generic world generator
(tile lookup by property instead of hardcoded names), actinide element category.

487 tests passing (32 new).

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

tests/creatures.test.ts

@@ -71,8 +71,8 @@ function createPlayerEntity(world: World, x: number, y: number): number {
 // ─── Species Data ────────────────────────────────────────────────
 
 describe('Species Data', () => {
-  it('loads 3 species from JSON', () => {
-    expect(allSpecies).toHaveLength(3);
+  it('loads 9 species from JSON (3 per biome)', () => {
+    expect(allSpecies).toHaveLength(9);
   });
 
   it('has Crystallid with correct properties', () => {
@@ -128,7 +128,7 @@ describe('Species Registry', () => {
   });
 
   it('has correct count', () => {
-    expect(registry.count).toBe(3);
+    expect(registry.count).toBe(9);
   });
 
   it('looks up by string ID', () => {
@@ -148,7 +148,27 @@ describe('Species Registry', () => {
 
   it('returns all species', () => {
     const all = registry.getAll();
-    expect(all).toHaveLength(3);
+    expect(all).toHaveLength(9);
+  });
+
+  it('can look up new Phase 9 species', () => {
+    expect(registry.get('pendulum')?.biome).toBe('kinetic-mountains');
+    expect(registry.get('mechanoid')?.biome).toBe('kinetic-mountains');
+    expect(registry.get('resonator')?.biome).toBe('kinetic-mountains');
+    expect(registry.get('symbiote')?.biome).toBe('verdant-forests');
+    expect(registry.get('mimic')?.biome).toBe('verdant-forests');
+    expect(registry.get('spore-bearer')?.biome).toBe('verdant-forests');
+  });
+
+  it('each biome has exactly 3 species', () => {
+    const all = registry.getAll();
+    const byBiome = new Map<string, number>();
+    for (const s of all) {
+      byBiome.set(s.biome, (byBiome.get(s.biome) ?? 0) + 1);
+    }
+    expect(byBiome.get('catalytic-wastes')).toBe(3);
+    expect(byBiome.get('kinetic-mountains')).toBe(3);
+    expect(byBiome.get('verdant-forests')).toBe(3);
   });
 });