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

tests/Paca.Tests/Infrastructure/UiContractPipeline.cs

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+using System.IO;
+using System.Reflection;
+using System.Text.RegularExpressions;
+using System.Xml.Linq;
+using Paca.App;
+using Paca.Browser;
+using Paca.Core.Config;
+
+namespace Paca.Tests.Infrastructure;
+
+/// <summary>
+/// 19차 UI 계약 검증 파이프라인 엔진:
+/// 단순 파일 문자열 검색의 취약점을 제거하고, XAML 파싱, 리소스 딕셔너리 검증,
+/// 타입/속성 리플렉션을 정밀하게 수행하여 UI 계약(Contract)을 파이프라인으로 일괄 검증한다.
+/// </summary>
+public static class UiContractPipeline
+{
+    private static readonly Lazy<XDocument> _mainWindowDoc = new(() => XDocument.Load(SourceTree.AppPath("MainWindow.xaml")));
+    private static readonly Lazy<XDocument> _settingsDoc = new(() => XDocument.Load(SourceTree.AppPath("SettingsWindow.xaml")));
+    private static readonly Lazy<XDocument> _sharedDoc = new(() => XDocument.Load(SourceTree.AppPath("Themes/Shared.xaml")));
+
+    public static XDocument MainWindowDoc => _mainWindowDoc.Value;
+    public static XDocument SettingsDoc => _settingsDoc.Value;
+    public static XDocument SharedDoc => _sharedDoc.Value;
+
+    /// <summary>XAML 내에 특정 x:Name 또는 Name 속성을 가진 요소가 존재하는지 검증</summary>
+    public static bool HasElementNamed(XDocument doc, string name)
+    {
+        return doc.Descendants().Any(e =>
+            (string?)e.Attribute("Name") == name ||
+            (string?)e.Attribute(XName.Get("Name", "http://schemas.microsoft.com/winfx/2006/xaml")) == name);
+    }
+
+    /// <summary>XAML 내에 특정 x:Key 리소스가 존재하는지 검증</summary>
+    public static bool HasResourceKey(XDocument doc, string key)
+    {
+        return doc.Descendants().Any(e =>
+            (string?)e.Attribute(XName.Get("Key", "http://schemas.microsoft.com/winfx/2006/xaml")) == key);
+    }
+
+    /// <summary>타입 내에 명시된 속성이 존재하는지 검증</summary>
+    public static bool HasProperty(Type type, string propertyName)
+        => type.GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static) != null;
+
+    /// <summary>타입 내에 명시된 메서드가 존재하는지 검증</summary>
+    public static bool HasMethod(Type type, string methodName)
+        => type.GetMethods(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static)
+               .Any(m => m.Name == methodName);
+
+    /// <summary>유즈케이스 계약 어설션 파이프라인</summary>
+    public static void AssertContract(bool condition, string usecaseId, string message)
+    {
+        Xunit.Assert.True(condition, $"[계약 위반: {usecaseId}] {message}");
+    }
+}