feat: implement free-field CPU beamforming

tests/integration/cpu-baseline.test.js

@@ -0,0 +1,34 @@
+import { computeDasMap } from "/packages/acoustics-core/das.js";
+import { distance3 } from "/packages/acoustics-core/math.js";
+import { synthesizeMicrophoneSignals } from "/packages/acoustics-core/propagation.js";
+
+async function loadJson(path) {
+  const response = await fetch(path);
+  assert(response.ok, `${path} load failed`);
+  return response.json();
+}
+
+test("192채널 · 50×50 CPU baseline이 ground truth를 찾는다", async () => {
+  const [arrayDefinition, scene, experiment] = await Promise.all([
+    loadJson("/assets/array-geometries/rectangular-16x12.array.json"),
+    loadJson("/assets/sample-scenes/single-tone.scene.json"),
+    loadJson("/assets/sample-scenes/single-tone.experiment.json"),
+  ]);
+  const startedAt = performance.now();
+  const synthesis = synthesizeMicrophoneSignals({ scene, arrayDefinition });
+  const result = await computeDasMap({
+    channels: synthesis.channels,
+    sampleRate: synthesis.sampleRate,
+    arrayDefinition,
+    scene,
+    experiment,
+  });
+  const elapsedMs = performance.now() - startedAt;
+  const localizationError = distance3(result.bands[0].peak.position, scene.sources[0].position);
+
+  assertEqual(result.microphoneCount, 192, "microphone count");
+  assertEqual(result.pointCount, 2500, "scan point count");
+  assert(localizationError < 0.03, `localization error=${localizationError} m`);
+  assert(Number.isFinite(result.bands[0].peak.rawPower) && result.bands[0].peak.rawPower > 0, "finite peak power");
+  document.documentElement.dataset.cpuBaselineMs = elapsedMs.toFixed(1);
+});