Add read-only MG4 ADB status collector

server/tests/app.test.ts

@@ -16,7 +16,8 @@ function testConfig(): AppConfig {
     cookieSecure: false,
     allowedOrigins: new Set(["http://mg4pi.local:8787"]),
     updateStatusPath: `/tmp/pi-car-companion-test-${process.pid}-missing-update.json`,
-    versionFile: `/tmp/pi-car-companion-test-${process.pid}-missing-revision`
+    versionFile: `/tmp/pi-car-companion-test-${process.pid}-missing-revision`,
+    adb: { enabled: false, executable: "adb", serial: null, timeoutMs: 3_000 }
   };
 }
 
@@ -156,7 +157,10 @@ describe("authentication boundary", () => {
       headers: { cookie: `${SESSION_COOKIE}=${sessionCookie?.value ?? ""}` }
     });
     expect(status.statusCode, status.body).toBe(200);
-    expect(status.json()).toMatchObject({ service: { state: "healthy" } });
+    expect(status.json()).toMatchObject({
+      service: { state: "healthy" },
+      headUnit: { available: false, state: "disabled" }
+    });
 
     const update = await app.inject({
       method: "POST",