Add OpenCode Zen provider support

packages/ai/test/zen.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vitest";
+import { MODELS } from "../src/models.generated.js";
+import { complete } from "../src/stream.js";
+import type { Model } from "../src/types.js";
+
+describe("OpenCode Zen Models Smoke Test", () => {
+	const zenModels = Object.values(MODELS.opencode);
+
+	zenModels.forEach((model) => {
+		it(`${model.id}`, async () => {
+			const response = await complete(model as Model<any>, {
+				messages: [{ role: "user", content: "Say hello.", timestamp: Date.now() }],
+			});
+
+			expect(response.content).toBeTruthy();
+			expect(response.stopReason).toBe("stop");
+		}, 60000);
+	});
+});