런처 워크스페이스 복원 매칭과 ~restore 명령을 보강

변경 목적:
- 런처 ~ 예약어의 창 복원 품질을 점검하고, 같은 exe의 첫 창만 반복 재사용되어 브라우저/다중 창 배치가 꼬이던 문제를 줄입니다.
- 도움말에만 있던 ~restore, ~list 명령을 실제 핸들러 동작과 맞춥니다.

핵심 수정사항:
- ContextManager가 열린 창 후보를 exe + 제목 유사도 기준으로 매칭하고, 이미 다른 스냅샷에 배정된 핸들은 재사용하지 않도록 변경했습니다.
- WorkspaceHandler에 ~restore <이름>, ~list 지원과 최근 저장 순 프로필 목록 복원 액션 정리를 추가했습니다.
- WorkspaceHandlerTests, ContextManagerTests를 추가해 명령 파싱과 창 매칭 우선순위를 회귀 검증합니다.
- README.md, docs/DEVELOPMENT.md에 검토 결과와 검증 이력을 기록했습니다.

검증 결과:
- dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify_workspace_restore_review\\ -p:IntermediateOutputPath=obj\\verify_workspace_restore_review\\
- dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter WorkspaceHandlerTests^|ContextManagerTests -p:OutputPath=bin\\verify_workspace_restore_review_tests\\ -p:IntermediateOutputPath=obj\\verify_workspace_restore_review_tests\\
- 경고 0 / 오류 0, 테스트 6건 통과

src/AxCopilot.Tests/Core/ContextManagerTests.cs

@@ -0,0 +1,65 @@
+using AxCopilot.Core;
+using AxCopilot.Models;
+using FluentAssertions;
+using Xunit;
+
+namespace AxCopilot.Tests.Core;
+
+public class ContextManagerTests
+{
+    [Fact]
+    public void NormalizeWindowTitle_StripsKnownBrowserSuffix()
+    {
+        var normalized = ContextManager.NormalizeWindowTitle("Inbox - Google Chrome");
+
+        normalized.Should().Be("inbox");
+    }
+
+    [Fact]
+    public void CalculateTitleMatchScore_ExactTitle_BeatsPartialTitle()
+    {
+        var exact = ContextManager.CalculateTitleMatchScore("Inbox - Google Chrome", "Inbox - Google Chrome");
+        var partial = ContextManager.CalculateTitleMatchScore("Inbox - Google Chrome", "Inbox - Chrome");
+
+        exact.Should().BeGreaterThan(partial);
+    }
+
+    [Fact]
+    public void SelectBestMatchingWindow_PrefersExactTitleAmongSameExe()
+    {
+        var snapshot = new WindowSnapshot
+        {
+            Exe = @"C:\Program Files\Google\Chrome\Application\chrome.exe",
+            Title = "Inbox - Google Chrome"
+        };
+
+        var candidates = new[]
+        {
+            new ContextManager.WindowCandidate(new IntPtr(1), snapshot.Exe, "Docs - Google Chrome"),
+            new ContextManager.WindowCandidate(new IntPtr(2), snapshot.Exe, "Inbox - Google Chrome")
+        };
+
+        var selected = ContextManager.SelectBestMatchingWindow(snapshot, candidates);
+
+        selected.Should().Be(new IntPtr(2));
+    }
+
+    [Fact]
+    public void SelectBestMatchingWindow_SkipsAlreadyUsedHandle()
+    {
+        var snapshot = new WindowSnapshot
+        {
+            Exe = @"C:\Program Files\Google\Chrome\Application\chrome.exe",
+            Title = "Inbox - Google Chrome"
+        };
+
+        var candidates = new[]
+        {
+            new ContextManager.WindowCandidate(new IntPtr(1), snapshot.Exe, "Inbox - Google Chrome")
+        };
+
+        var selected = ContextManager.SelectBestMatchingWindow(snapshot, candidates, new HashSet<IntPtr> { new(1) });
+
+        selected.Should().Be(IntPtr.Zero);
+    }
+}

src/AxCopilot.Tests/Handlers/WorkspaceHandlerTests.cs

@@ -0,0 +1,64 @@
+using AxCopilot.Core;
+using AxCopilot.Handlers;
+using AxCopilot.Models;
+using AxCopilot.Services;
+using FluentAssertions;
+using Xunit;
+
+namespace AxCopilot.Tests.Handlers;
+
+public class WorkspaceHandlerTests
+{
+    [Fact]
+    public async Task GetItemsAsync_RestoreSubcommand_ReturnsRestoreAction()
+    {
+        var settings = new SettingsService();
+        settings.Settings.Profiles.Add(new WorkspaceProfile
+        {
+            Name = "업무",
+            Windows = new List<WindowSnapshot> { new() { Exe = "chrome.exe", Title = "메일" } },
+            CreatedAt = new DateTime(2026, 4, 15, 9, 0, 0)
+        });
+
+        var handler = new WorkspaceHandler(new ContextManager(settings), settings);
+
+        var items = (await handler.GetItemsAsync("restore 업무", CancellationToken.None)).ToList();
+
+        items.Should().ContainSingle();
+        items[0].Title.Should().Contain("업무");
+        items[0].Data.Should().BeOfType<WorkspaceAction>();
+
+        var action = (WorkspaceAction)items[0].Data!;
+        action.Type.Should().Be(WorkspaceActionType.Restore);
+        action.Name.Should().Be("업무");
+    }
+
+    [Fact]
+    public async Task GetItemsAsync_ListSubcommand_ReturnsSavedProfiles()
+    {
+        var settings = new SettingsService();
+        settings.Settings.Profiles.Add(new WorkspaceProfile
+        {
+            Name = "업무",
+            Windows = new List<WindowSnapshot> { new() { Exe = "chrome.exe", Title = "메일" } },
+            CreatedAt = new DateTime(2026, 4, 15, 9, 0, 0)
+        });
+        settings.Settings.Profiles.Add(new WorkspaceProfile
+        {
+            Name = "개발",
+            Windows = new List<WindowSnapshot> { new() { Exe = "code.exe", Title = "AX Copilot" } },
+            CreatedAt = new DateTime(2026, 4, 15, 10, 0, 0)
+        });
+
+        var handler = new WorkspaceHandler(new ContextManager(settings), settings);
+
+        var items = (await handler.GetItemsAsync("list", CancellationToken.None)).ToList();
+
+        items.Should().HaveCount(2);
+        items[0].Title.Should().Be("~개발");
+        items[1].Title.Should().Be("~업무");
+        items.All(item => item.Data is WorkspaceAction action && action.Type == WorkspaceActionType.Restore)
+            .Should()
+            .BeTrue();
+    }
+}