feat: add polar x tts and storage integration adapters with tests

test/tts-client-integration.test.js

@@ -0,0 +1,32 @@
+"use strict";
+
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { createTTSAdapter } = require("../src/integrations/tts-client");
+
+test("synthesize returns buffer from openai response", async () => {
+  const adapter = createTTSAdapter({
+    client: {
+      audio: {
+        speech: {
+          async create() {
+            return {
+              async arrayBuffer() {
+                return Uint8Array.from([1, 2, 3]).buffer;
+              },
+            };
+          },
+        },
+      },
+    },
+  });
+
+  const bytes = await adapter.synthesize("hello");
+  assert.equal(Buffer.isBuffer(bytes), true);
+  assert.equal(bytes.length, 3);
+});
+
+test("throws when tts adapter is not configured", async () => {
+  const adapter = createTTSAdapter({});
+  await assert.rejects(() => adapter.synthesize("hello"), /tts_not_configured/);
+});