fix: gate image tool and deepgram audio payload

src/media-understanding/providers/deepgram/audio.live.test.ts

@@ -31,21 +31,17 @@ async function fetchSampleBuffer(url: string, timeoutMs: number): Promise<Buffer
 }
 
 describeLive("deepgram live", () => {
-  it(
-    "transcribes sample audio",
-    async () => {
-      const buffer = await fetchSampleBuffer(SAMPLE_URL, 15000);
-      const result = await transcribeDeepgramAudio({
-        buffer,
-        fileName: "sample.wav",
-        mime: "audio/wav",
-        apiKey: DEEPGRAM_KEY,
-        model: DEEPGRAM_MODEL,
-        baseUrl: DEEPGRAM_BASE_URL,
-        timeoutMs: 20000,
-      });
-      expect(result.text.trim().length).toBeGreaterThan(0);
-    },
-    30000,
-  );
+  it("transcribes sample audio", async () => {
+    const buffer = await fetchSampleBuffer(SAMPLE_URL, 15000);
+    const result = await transcribeDeepgramAudio({
+      buffer,
+      fileName: "sample.wav",
+      mime: "audio/wav",
+      apiKey: DEEPGRAM_KEY,
+      model: DEEPGRAM_MODEL,
+      baseUrl: DEEPGRAM_BASE_URL,
+      timeoutMs: 20000,
+    });
+    expect(result.text.trim().length).toBeGreaterThan(0);
+  }, 30000);
 });

src/media-understanding/providers/deepgram/audio.test.ts

@@ -84,6 +84,6 @@ describe("transcribeDeepgramAudio", () => {
     expect(headers.get("authorization")).toBe("Token test-key");
     expect(headers.get("x-custom")).toBe("1");
     expect(headers.get("content-type")).toBe("audio/wav");
-    expect(Buffer.isBuffer(seenInit?.body)).toBe(true);
+    expect(seenInit?.body).toBeInstanceOf(Uint8Array);
   });
 });

src/media-understanding/runner.ts

@@ -293,9 +293,9 @@ async function runProviderEntry(params: {
     const providerConfig = cfg.models?.providers?.[providerId];
     const baseUrl = entry.baseUrl ?? params.config?.baseUrl ?? providerConfig?.baseUrl;
     const mergedHeaders = {
-      ...(providerConfig?.headers ?? {}),
-      ...(params.config?.headers ?? {}),
-      ...(entry.headers ?? {}),
+      ...providerConfig?.headers,
+      ...params.config?.headers,
+      ...entry.headers,
     };
     const headers = Object.keys(mergedHeaders).length > 0 ? mergedHeaders : undefined;
     const providerQuery = resolveProviderQuery({