feat: add sentiment analyst agent

app/agents/__tests__/sentiment.test.ts

@@ -0,0 +1,38 @@
+import { describe, it, expect } from "vitest";
+import { SentimentAnalyst } from "../sentiment";
+import type { OpenRouterClient } from "../../lib/openrouter";
+
+describe("SentimentAnalyst", () => {
+  it("should analyze sentiment from headlines", async () => {
+    const mockClient = {
+      createChatCompletion: async () => ({
+        choices: [
+          {
+            message: {
+              content:
+                '{"signal":"bullish","confidence":0.85,"reasoning":"Positive sentiment from news"}',
+            },
+          },
+        ],
+      }),
+    } as unknown as OpenRouterClient;
+
+    const analyst = new SentimentAnalyst(mockClient);
+    const result = await analyst.analyze("AAPL", {
+      headlines: ["Apple beats earnings", "New iPhone launch"],
+      source: "news",
+    });
+
+    expect(result.analyst).toBe("sentiment");
+    expect(result.signal.signal).toBe("bullish");
+  });
+
+  it("should use specified model", () => {
+    const mockClient = {} as unknown as OpenRouterClient;
+    const analyst = new SentimentAnalyst(mockClient, {
+      model: "custom/model",
+    });
+
+    expect(analyst.getModel()).toBe("custom/model");
+  });
+});