Feat: Add Bull Dip Buyer strategy

lib/strategies/bull-dip-buyer.js

@@ -0,0 +1,44 @@
+import { BaseStrategy } from './base.js';
+
+export class BullDipBuyer extends BaseStrategy {
+  constructor(config = {}) {
+    super('bull-dip-buyer', {
+      maxYesPrice: config.maxYesPrice || 45, // Buy the dip when Yes is cheap
+      minYesPrice: config.minYesPrice || 15, // Avoid completely dead markets
+      betSize: config.betSize || 2,
+      cooldownMs: config.cooldownMs || 60000,
+      ...config
+    });
+    
+    this.lastTradeTime = 0;
+    this.lastTradeTicker = null;
+  }
+
+  evaluate(state) {
+    if (!state || !this.enabled) return null;
+
+    const now = Date.now();
+    if (now - this.lastTradeTime < this.config.cooldownMs) return null;
+    if (state.ticker === this.lastTradeTicker) return null;
+
+    const { yesPct } = state;
+
+    // Only buy YES when it dips into our target buy zone
+    if (yesPct <= this.config.maxYesPrice && yesPct >= this.config.minYesPrice) {
+      const signal = {
+        strategy: this.name,
+        side: 'yes',
+        price: yesPct,
+        size: this.config.betSize,
+        reason: `Bullish dip buy: Yes dropped to ${yesPct}¢`,
+        ticker: state.ticker
+      };
+
+      this.lastTradeTime = now;
+      this.lastTradeTicker = state.ticker;
+      return signal;
+    }
+
+    return null;
+  }
+}