Fixed for decoder dl speed and mobile warnings on low memory devices.

tests/mobileMemoryGuard.test.ts

@@ -70,6 +70,20 @@ describe("shouldWarnBeforeLoad", () => {
     ).toBe(false);
   });
 
+  // D-029: deviceMemoryGB 2-4 is the ordinary (not just budget) Android
+  // range today — these must still warn for Medium+, the exact class of
+  // phone the original D-027 crash report was about.
+  test("warns on mobile mid-range devices (deviceMemory 2-4) for Medium+", () => {
+    for (const deviceMemoryGB of [2, 4]) {
+      expect(
+        shouldWarnBeforeLoad(
+          { userAgent: ANDROID_UA, maxTouchPoints: 5, deviceMemoryGB },
+          MEDIUM_PEAK_BYTES,
+        ),
+      ).toBe(true);
+    }
+  });
+
   test("falls back to a flat threshold when deviceMemory is unreported (iOS)", () => {
     expect(
       shouldWarnBeforeLoad(