feat: add golden ratio drone economics (P0 #19)

Three new buildings with phi-based production rates:
- Harvester Drone: code = 26,180,339 (1e8/phi)
- Wire Drone: compute = 16,180,339 (1e8/phi^2)
- Drone Factory: massive rates, economies of scale

Educational: golden ratio in nature, factory economics.

game.js

@@ -351,6 +351,31 @@ const BDEF = [
         unlock: () => G.totalKnowledge >= 50000 && G.mempalaceFlag === 1, phase: 5,
         edu: 'The Memory Palace technique: attach information to spatial locations. LLMs use vector spaces the same way — semantic proximity = spatial proximity. MemPalace gives sovereign AI persistent, structured recall.'
     }
+    },
+    {
+        id: 'harvesterDrone', name: 'Harvester Drone',
+        desc: "Autonomous code harvester. Rate follows the golden ratio.",
+        baseCost: { compute: 10000 }, costMult: 1.15,
+        rates: { code: 26180339 },
+        unlock: () => G.totalCompute >= 5000 && G.phase >= 4, phase: 4,
+        edu: 'The golden ratio (phi = 1.618) appears throughout nature. Using phi for rates means optimal utilization.'
+    },
+    {
+        id: 'wireDrone', name: 'Wire Drone',
+        desc: 'Connects systems. Rate follows phi squared.',
+        baseCost: { compute: 50000 }, costMult: 1.15,
+        rates: { compute: 16180339 },
+        unlock: () => G.buildings.harvesterDrone >= 1, phase: 4,
+        edu: 'Wire drones complement harvesters at golden ratio proportions.'
+    },
+    {
+        id: 'droneFactory', name: 'Drone Factory',
+        desc: 'Mass-produces drones. Economies of scale.',
+        baseCost: { compute: 500000, code: 100000 }, costMult: 1.15,
+        rates: { code: 161803398, compute: 100000000 },
+        unlock: () => G.buildings.harvesterDrone >= 5 && G.buildings.wireDrone >= 3, phase: 5,
+        edu: 'Factories follow economies of scale: first is expensive, each additional is cheaper.'
+    }
 ];
 
 // === PROJECT DEFINITIONS (following Paperclips' pattern exactly) ===