Feat: Add Momentum Rider strategy

lib/strategies/momentum-rider.js

@@ -0,0 +1,56 @@
+import { BaseStrategy } from './base.js';
+
+export class MomentumRiderStrategy extends BaseStrategy {
+  constructor(config = {}) {
+    super('momentum-rider', {
+      triggerPct: config.triggerPct || 75,
+      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, noPct } = state;
+    const trigger = this.config.triggerPct;
+
+    let signal = null;
+
+    // Buy the favorite!
+    if (yesPct >= trigger && yesPct < 99) {
+      signal = {
+        strategy: this.name,
+        side: 'yes',
+        price: yesPct,
+        size: this.config.betSize,
+        reason: `Riding Momentum! Yes is at ${yesPct}%`,
+        ticker: state.ticker
+      };
+    } else if (noPct >= trigger && noPct < 99) {
+      signal = {
+        strategy: this.name,
+        side: 'no',
+        price: noPct,
+        size: this.config.betSize,
+        reason: `Riding Momentum! No is at ${noPct}%`,
+        ticker: state.ticker
+      };
+    }
+
+    if (signal) {
+      this.lastTradeTime = now;
+      this.lastTradeTicker = state.ticker;
+    }
+
+    return signal;
+  }
+}