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

tests/Paca.Tests/Mobile/MobileAdMobInterstitialAndRewardedGateTests.cs

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+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Paca.Mobile.Core;
+using Xunit;
+
+namespace Paca.Tests.Mobile;
+
+public class MobileAdMobInterstitialAndRewardedGateTests
+{
+    private static readonly string SolutionRoot = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));
+
+    [Fact]
+    public async Task Gate_AdMobWaterfallController_ShowInterstitial_DelegatesToAdapter()
+    {
+        var directMgr = new MobileAdManager();
+        var successAdapter = new MockAdMobAdapter(shouldSucceed: true);
+        var controller = new AdMobWaterfallController(successAdapter, directMgr);
+
+        var result = await controller.ShowInterstitialAsync();
+        Assert.True(result);
+
+        var failureAdapter = new MockAdMobAdapter(shouldSucceed: false);
+        var failController = new AdMobWaterfallController(failureAdapter, directMgr);
+        var failResult = await failController.ShowInterstitialAsync();
+        Assert.False(failResult);
+    }
+
+    [Fact]
+    public async Task Gate_AdMobWaterfallController_ShowRewarded_DelegatesToAdapter()
+    {
+        var directMgr = new MobileAdManager();
+        var successAdapter = new MockAdMobAdapter(shouldSucceed: true);
+        var controller = new AdMobWaterfallController(successAdapter, directMgr);
+
+        var result = await controller.ShowRewardedAsync();
+        Assert.True(result);
+
+        var failureAdapter = new MockAdMobAdapter(shouldSucceed: false);
+        var failController = new AdMobWaterfallController(failureAdapter, directMgr);
+        var failResult = await failController.ShowRewardedAsync();
+        Assert.False(failResult);
+    }
+
+    [Fact]
+    public async Task Gate_AdMobRewardCoordinator_AutomaticallyGrantsBoost_OnRewardEarned()
+    {
+        var tokenManager = new RewardedBoostTokenManager();
+        Assert.False(tokenManager.IsBoostActive);
+
+        var mockAdapter = new MockAdMobAdapter(shouldSucceed: true);
+        var coordinator = new AdMobRewardCoordinator(mockAdapter, tokenManager);
+
+        var shown = await coordinator.RequestAndShowRewardAdAsync();
+        Assert.True(shown);
+        Assert.True(tokenManager.IsBoostActive);
+        Assert.True(tokenManager.RemainingBoostTime.TotalMinutes > 50);
+    }
+
+    [Fact]
+    public void Gate_AndroidAdMobAdapter_SourceAudit_EnsuresRealRewardEventAndInvocation()
+    {
+        var adapterPath = Path.Combine(SolutionRoot, "src", "Paca.Mobile", "Platforms", "Android", "AndroidAdMobAdapter.cs");
+        Assert.True(File.Exists(adapterPath), $"AndroidAdMobAdapter.cs must exist at {adapterPath}");
+
+        var code = File.ReadAllText(adapterPath);
+        Assert.Contains("public event Action<string, double>? OnUserEarnedReward;", code);
+        Assert.Contains("OnUserEarnedReward?.Invoke", code);
+    }
+}