refactor(config): reuse legacy audio transcription migration path

src/config/legacy-migrate.test.ts

@@ -0,0 +1,66 @@
+import { describe, expect, it } from "vitest";
+import { migrateLegacyConfig } from "./legacy-migrate.js";
+
+describe("legacy migrate audio transcription", () => {
+  it("moves routing.transcribeAudio into tools.media.audio.models", () => {
+    const res = migrateLegacyConfig({
+      routing: {
+        transcribeAudio: {
+          command: ["whisper", "--model", "base"],
+          timeoutSeconds: 2,
+        },
+      },
+    });
+
+    expect(res.changes).toContain("Moved routing.transcribeAudio → tools.media.audio.models.");
+    expect(res.config?.tools?.media?.audio).toEqual({
+      enabled: true,
+      models: [
+        {
+          command: "whisper",
+          type: "cli",
+          args: ["--model", "base"],
+          timeoutSeconds: 2,
+        },
+      ],
+    });
+    expect((res.config as { routing?: unknown } | null)?.routing).toBeUndefined();
+  });
+
+  it("keeps existing tools media model and drops legacy routing value", () => {
+    const res = migrateLegacyConfig({
+      routing: {
+        transcribeAudio: {
+          command: ["whisper", "--model", "tiny"],
+        },
+      },
+      tools: {
+        media: {
+          audio: {
+            models: [{ command: "existing", type: "cli" }],
+          },
+        },
+      },
+    });
+
+    expect(res.changes).toContain(
+      "Removed routing.transcribeAudio (tools.media.audio.models already set).",
+    );
+    expect(res.config?.tools?.media?.audio?.models).toEqual([{ command: "existing", type: "cli" }]);
+    expect((res.config as { routing?: unknown } | null)?.routing).toBeUndefined();
+  });
+
+  it("drops invalid audio.transcription payloads", () => {
+    const res = migrateLegacyConfig({
+      audio: {
+        transcription: {
+          command: [{}],
+        },
+      },
+    });
+
+    expect(res.changes).toContain("Removed audio.transcription (invalid or empty command).");
+    expect(res.config?.audio).toBeUndefined();
+    expect(res.config?.tools?.media?.audio).toBeUndefined();
+  });
+});