fix(tts): migrate legacy edge config in doctor

extensions/microsoft/speech-provider.test.ts

@@ -184,27 +184,6 @@ describe("buildMicrosoftSpeechProvider", () => {
     vi.restoreAllMocks();
   });
 
-  it("accepts legacy providers.edge voice config", () => {
-    const provider = buildMicrosoftSpeechProvider();
-
-    const resolved = provider.resolveConfig?.({
-      cfg: TEST_CFG,
-      rawConfig: {
-        provider: "edge",
-        providers: {
-          edge: {
-            voice: "en-US-AvaNeural",
-          },
-        },
-      },
-      timeoutMs: 1000,
-    });
-
-    expect(resolved).toMatchObject({
-      voice: "en-US-AvaNeural",
-    });
-  });
-
   it("switches to a Chinese voice for CJK text when no explicit voice override is set", async () => {
     const provider = buildMicrosoftSpeechProvider();
     const edgeSpy = vi.spyOn(ttsModule, "edgeTTS").mockImplementation(async ({ outputPath }) => {