feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/Core/AdaptiveBufferScalerGateTests.cs

@@ -0,0 +1,55 @@
+using System;
+using Paca.Mobile.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class AdaptiveBufferScalerGateTests
+{
+    [Fact]
+    public void Gate393_AdaptiveBufferScaler_SelectsGigabitUltra_ForHighThroughput()
+    {
+        // 80 MB/s
+        var speed = 80.0 * 1024 * 1024;
+        var profile = AdaptiveBufferScaler.GetAdaptationProfile(speed);
+
+        Assert.Equal(BufferScalingTier.GigabitUltra, profile.CurrentTier);
+        Assert.Equal(512 * 1024, profile.BufferSizeBytes);
+        Assert.Equal(20 * 1024 * 1024L, profile.RecommendedChunkSizeBytes);
+    }
+
+    [Fact]
+    public void Gate394_AdaptiveBufferScaler_SelectsMedium_ForModerateSpeed()
+    {
+        // 5 MB/s
+        var speed = 5.0 * 1024 * 1024;
+        var profile = AdaptiveBufferScaler.GetAdaptationProfile(speed);
+
+        Assert.Equal(BufferScalingTier.MediumBandwidth, profile.CurrentTier);
+        Assert.Equal(32 * 1024, profile.BufferSizeBytes);
+        Assert.Equal(5 * 1024 * 1024L, profile.RecommendedChunkSizeBytes);
+    }
+
+    [Fact]
+    public void Gate395_AdaptiveBufferScaler_SelectsLow_ForSlowConnections()
+    {
+        // 500 KB/s
+        var speed = 500.0 * 1024;
+        var profile = AdaptiveBufferScaler.GetAdaptationProfile(speed);
+
+        Assert.Equal(BufferScalingTier.LowBandwidth, profile.CurrentTier);
+        Assert.Equal(8 * 1024, profile.BufferSizeBytes);
+        Assert.Equal(1 * 1024 * 1024L, profile.RecommendedChunkSizeBytes);
+    }
+
+    [Fact]
+    public void Gate396_AdaptiveBufferScaler_SmoothsSpeed_WithExponentialMovingAverage()
+    {
+        var prevAvg = 10.0;
+        var newSample = 20.0;
+        // With alpha 0.3: 0.3 * 20 + 0.7 * 10 = 6 + 7 = 13.0
+        var smoothed = AdaptiveBufferScaler.SmoothSpeedEma(prevAvg, newSample, alpha: 0.3);
+
+        Assert.Equal(13.0, smoothed, 2);
+    }
+}