fix: Bilbo randomness — roll once per tick (#88)

js/engine.js

@@ -77,14 +77,16 @@ function updateRates() {
         G.userRate += 5 * timmyCount * (timmyMult - 1);
     }
 
-    // Bilbo randomness: 10% chance of massive creative burst
+    // Bilbo randomness: flags are set per-tick in tick(), not here
-    if (G.buildings.bilbo > 0 && Math.random() < CONFIG.BILBO_BURST_CHANCE) {
+    // updateRates() is called from many non-tick contexts (buy, resolve, sprint)
+    if (G.buildings.bilbo > 0) {
+        if (G.bilboBurstActive) {
             G.creativityRate += 50 * G.buildings.bilbo;
         }
-    // Bilbo vanishing: 5% chance of zero creativity this tick
+        if (G.bilboVanishActive) {
-    if (G.buildings.bilbo > 0 && Math.random() < CONFIG.BILBO_VANISH_CHANCE) {
             G.creativityRate = 0;
         }
+    }
 
     // Allegro requires trust
     if (G.buildings.allegro > 0 && G.trust < 5) {