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>

src/world/resources.ts

@@ -39,9 +39,9 @@ export function spawnResources(
 ): Map<number, ResourceInfo> {
   const resourceData = new Map<number, ResourceInfo>();
 
-  // Find tile IDs for resource types
-  const mineralTile = biome.tiles.find(t => t.name === 'mineral-vein');
-  const geyserTile = biome.tiles.find(t => t.name === 'geyser');
+  // Find tile IDs for resource types (generic: resource + interactive tiles)
+  const mineralTile = biome.tiles.find(t => t.resource);
+  const geyserTile = biome.tiles.find(t => t.interactive);
 
   const configs: ResourceTileConfig[] = [];