fix: expose physical aliasing and delayed arrivals

tests/unit/realtime-localizer.test.js

@@ -112,6 +112,30 @@ test("portable localizer가 Scene 합성 없이 기존 CPU DAS와 bit-exact map
   );
 });
 
+test("portable above-Nyquist band observes the folded ADC bin without hidden carrier steering", async () => {
+  const fixture = createFixture(128);
+  const basebandPlan = createLocalizationPlan(fixture.config);
+  const aliasedPlan = createLocalizationPlan({
+    ...fixture.config,
+    bands: [{ id: "aliased", minHz: 3_572, maxHz: 3_596, color: "#58c7ff" }],
+  });
+  const baseband = await localizeMultichannel({
+    plan: basebandPlan,
+    channels: fixture.channels,
+  });
+  const aliased = await localizeMultichannel({
+    plan: aliasedPlan,
+    channels: fixture.channels,
+  });
+
+  assertEqual(aliasedPlan.bands[0].minHz, 3_572, "requested analog band is retained");
+  assertFloat32Exact(
+    aliased.bands[0].rawMap,
+    baseband.bands[0].rawMap,
+    "same ADC bin produces the same conventional DAS map",
+  );
+});
+
 test("portable raw-map peak detection이 같은 band의 두 진원 후보를 강도순으로 보존한다", () => {
   const scan = {
     z: 1,