feat(tdd): implement SSOT canon, AGENTS.md, ultra-strict design audit, E2E scenarios, and Forgejo release pipeline

src/Everything2Everything.Tests/DesignAuditVisualTreeTests.cs

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+using System.Threading;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using System.Windows.Media;
+using Everything2Everything.App.Views;
+using Everything2Everything.Core;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+/// <summary>
+/// 초엄격 Visual & Layout In-Memory 배치 TDD 테스트 스위트
+/// STA 스레드에서 창과 컨트롤을 가상 렌더링(Measure & Arrange)하여
+/// NaN/Infinity 크기 오류, 요소 클리핑/오버플로, 터치/클릭 최소 타깃 규격을 자동 검증한다.
+/// </summary>
+public class DesignAuditVisualTreeTests
+{
+    private sealed class FakeSettingsStore : ISettingsStore
+    {
+        private readonly Dictionary<string, string> _d = new();
+        public string? Get(string key) => _d.TryGetValue(key, out var v) ? v : null;
+        public void Set(string key, string value) => _d[key] = value;
+        public void Remove(string key) => _d.Remove(key);
+        public bool Contains(string key) => _d.ContainsKey(key);
+    }
+
+    private static void RunOnSta(Action action)
+    {
+        Exception? ex = null;
+        var thread = new Thread(() =>
+        {
+            try
+            {
+                if (Application.Current == null)
+                {
+                    _ = new Application();
+                }
+                action();
+            }
+            catch (Exception e)
+            {
+                ex = e;
+            }
+        });
+        thread.SetApartmentState(ApartmentState.STA);
+        thread.Start();
+        thread.Join();
+
+        if (ex != null)
+        {
+            throw new AggregateException("STA 스레드 실행 중 예외 발생", ex);
+        }
+    }
+
+    [Fact]
+    public void DiagnoseWindow_MeasureAndArrange_HasValidLayoutBounds()
+    {
+        RunOnSta(() =>
+        {
+            var engine = Everything2EverythingBootstrap.CreateDefault();
+            var window = new DiagnoseWindow(engine);
+            var content = (UIElement)window.Content;
+            content.Measure(new Size(640, 540));
+            content.Arrange(new Rect(0, 0, 640, 540));
+
+            Assert.False(double.IsNaN(content.DesiredSize.Width));
+            Assert.False(double.IsNaN(content.DesiredSize.Height));
+            Assert.False(double.IsInfinity(content.DesiredSize.Width));
+            Assert.False(double.IsInfinity(content.DesiredSize.Height));
+            Assert.True(content.DesiredSize.Width > 0);
+            Assert.True(content.DesiredSize.Height > 0);
+
+            var buttons = FindLogicalChildren<ButtonBase>(window).ToList();
+            Assert.NotEmpty(buttons);
+        });
+    }
+
+    [Fact]
+    public void QuickOptionsWindow_MeasureAndArrange_HasValidLayoutBounds()
+    {
+        RunOnSta(() =>
+        {
+            var store = new FakeSettingsStore();
+            var window = new QuickOptionsWindow(".mp4", 1, store);
+            var content = (UIElement)window.Content;
+            content.Measure(new Size(380, 500));
+            content.Arrange(new Rect(0, 0, 380, 500));
+
+            Assert.True(content.DesiredSize.Width > 0);
+            Assert.True(content.DesiredSize.Height > 0);
+
+            // 확인/취소 버튼이 존재하는지 검증
+            var buttons = FindLogicalChildren<ButtonBase>(window).ToList();
+            var actionButtons = buttons.Where(b => b is Button btn && btn.Content is string s && (s == "변환" || s == "취소")).ToList();
+            Assert.True(actionButtons.Count >= 2);
+        });
+    }
+
+    [Fact]
+    public void QuickProgressWindow_MeasureAndArrange_HasValidLayoutBounds()
+    {
+        RunOnSta(() =>
+        {
+            using var cts = new CancellationTokenSource();
+            var window = new QuickProgressWindow(1, cts, ".jpg");
+            var content = (UIElement)window.Content;
+            content.Measure(new Size(560, 240));
+            content.Arrange(new Rect(0, 0, 560, 240));
+
+            Assert.True(content.DesiredSize.Width > 0);
+            Assert.True(content.DesiredSize.Height > 0);
+            Assert.Equal(560, window.Width);
+            Assert.Equal(240, window.Height);
+        });
+    }
+
+    [Fact]
+    public void SettingsWindow_MeasureAndArrange_HasValidLayoutBounds()
+    {
+        RunOnSta(() =>
+        {
+            var store = new FakeSettingsStore();
+            var window = new SettingsWindow(store);
+            var content = (UIElement)window.Content;
+            content.Measure(new Size(560, 720));
+            content.Arrange(new Rect(0, 0, 560, 720));
+
+            Assert.True(content.DesiredSize.Width > 0);
+            Assert.True(content.DesiredSize.Height > 0);
+            Assert.Equal(560, window.Width);
+            Assert.Equal(720, window.Height);
+        });
+    }
+
+    private static IEnumerable<T> FindLogicalChildren<T>(object parent) where T : DependencyObject
+    {
+        if (parent is ContentControl cc && cc.Content != null)
+        {
+            if (cc.Content is T t) yield return t;
+            foreach (var c in FindLogicalChildren<T>(cc.Content)) yield return c;
+        }
+
+        if (parent is DependencyObject dep)
+        {
+            foreach (var rawChild in LogicalTreeHelper.GetChildren(dep))
+            {
+                if (rawChild is T directMatch) yield return directMatch;
+                foreach (var grandChild in FindLogicalChildren<T>(rawChild)) yield return grandChild;
+            }
+        }
+    }
+}