코워크와 코드의 작업 폴더 선택 멈춤을 완화한다

- 작업 폴더 변경 직후 UI 스레드에서 실행되던 스킬 소스 재탐색을 백그라운드 재로드로 분리한다.

- 조건부 스킬 활성화 경로를 재로드와 분리해 첨부 파일 변경처럼 폴더가 바뀌지 않는 경우 불필요한 스킬 재탐색을 줄인다.

- README와 DEVELOPMENT 문서에 2026-04-14 19:02(KST) 기준 작업 이력과 검증 결과를 반영한다.

- 검증: dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify_folderpick\\ -p:IntermediateOutputPath=obj\\verify_folderpick\\ 경고 0 / 오류 0

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -130,6 +130,8 @@ public partial class ChatWindow : Window
     private readonly DispatcherTimer _agentProgressHintTimer;
     private readonly DispatcherTimer _tokenUsagePopupCloseTimer;
     private readonly DispatcherTimer _responsiveLayoutTimer;
+    private CancellationTokenSource? _workspaceSkillRefreshCts;
+    private int _workspaceSkillRefreshVersion;
     private CancellationTokenSource? _gitStatusRefreshCts;
     private int _displayedLength; // 현재 화면에 표시된 글자 수
     private ResourceDictionary? _agentThemeDictionary;
@@ -1833,7 +1835,7 @@ public partial class ChatWindow : Window
         UpdateChatTitle();
         RefreshConversationList();
         UpdateFolderBar();
-        UpdateConditionalSkillActivation(reset: true);
+        UpdateConditionalSkillActivation(reset: true, reloadSkillSources: true);
         Services.LogService.Info($"[SwitchTab] NO_SESSION done, emptyState={EmptyState.Visibility}");
     }
 
@@ -2228,7 +2230,7 @@ public partial class ChatWindow : Window
         UpdateFolderSelectButtonStyle();
         ScheduleGitBranchRefresh();
 
-        UpdateConditionalSkillActivation(reset: true);
+        UpdateConditionalSkillActivation(reset: true, reloadSkillSources: true);
     }
 
     private string GetCurrentWorkFolder()
@@ -2250,18 +2252,81 @@ public partial class ChatWindow : Window
         SkillService.LoadSkills(_settings.Settings.Llm.SkillsFolderPath, GetCurrentWorkFolder(), _settings.Settings.Llm.AdditionalSkillFolders);
     }
 
+    private void ScheduleWorkspaceSkillRefresh(bool reset = false)
+    {
+        if (!_settings.Settings.Llm.EnableSkillSystem)
+            return;
+
+        var version = Interlocked.Increment(ref _workspaceSkillRefreshVersion);
+        _workspaceSkillRefreshCts?.Cancel();
+        _workspaceSkillRefreshCts?.Dispose();
+        _workspaceSkillRefreshCts = new CancellationTokenSource();
+        var ct = _workspaceSkillRefreshCts.Token;
+
+        var skillFolder = _settings.Settings.Llm.SkillsFolderPath;
+        var workFolder = GetCurrentWorkFolder();
+        var additionalFolders = (_settings.Settings.Llm.AdditionalSkillFolders ?? [])
+            .Where(path => !string.IsNullOrWhiteSpace(path))
+            .ToArray();
+
+        _ = Task.Run(() =>
+        {
+            try
+            {
+                ct.ThrowIfCancellationRequested();
+                SkillService.EnsureSkillFolder();
+                SkillService.LoadSkills(skillFolder, workFolder, additionalFolders);
+                ct.ThrowIfCancellationRequested();
+
+                Dispatcher.BeginInvoke(new Action(() =>
+                {
+                    if (ct.IsCancellationRequested || version != _workspaceSkillRefreshVersion)
+                        return;
+
+                    ApplyConditionalSkillActivation(reset, workFolder);
+                }), DispatcherPriority.Background);
+            }
+            catch (OperationCanceledException)
+            {
+            }
+            catch (Exception ex)
+            {
+                Services.LogService.Debug($"작업 폴더 스킬 재로드 실패: {ex.Message}");
+            }
+        }, ct);
+    }
+
+    private void ApplyConditionalSkillActivation(bool reset = false, string? cwd = null)
+    {
+        if (!_settings.Settings.Llm.EnableSkillSystem)
+            return;
+
+        cwd ??= GetCurrentWorkFolder();
+        if (string.IsNullOrWhiteSpace(cwd) || !System.IO.Directory.Exists(cwd))
+            return;
+
+        if (reset)
+            SkillService.ResetConditionalSkillActivation();
+
+        SkillService.ActivateConditionalSkillsForPaths(_attachedFiles, cwd);
+    }
+
     /// <summary>
     /// 현재 작업 컨텍스트(첨부 파일 + 작업 폴더) 기준으로
     /// 조건부 paths 스킬 활성화를 갱신합니다.
     /// </summary>
-    private void UpdateConditionalSkillActivation(bool reset = false)
+    private void UpdateConditionalSkillActivation(bool reset = false, bool reloadSkillSources = false)
     {
-        if (!_settings.Settings.Llm.EnableSkillSystem) return;
-        EnsureSkillSystemLoadedForCurrentWorkspace();
-        var cwd = GetCurrentWorkFolder();
-        if (string.IsNullOrWhiteSpace(cwd) || !System.IO.Directory.Exists(cwd)) return;
-        if (reset) SkillService.ResetConditionalSkillActivation();
-        SkillService.ActivateConditionalSkillsForPaths(_attachedFiles, cwd);
+        if (!_settings.Settings.Llm.EnableSkillSystem)
+            return;
+
+        if (reloadSkillSources)
+        {
+            ScheduleWorkspaceSkillRefresh(reset);
+            return;
+        }
+
+        ApplyConditionalSkillActivation(reset);
     }
 
     private void BtnFolderClear_Click(object sender, RoutedEventArgs e)
@@ -3102,7 +3167,7 @@ public partial class ChatWindow : Window
         UpdateChatTitle();
         UpdateFolderBar();
         UpdateSelectedPresetGuide();
-        UpdateConditionalSkillActivation(reset: true);
+        UpdateConditionalSkillActivation(reset: true, reloadSkillSources: true);
         RenderMessages();
         RefreshConversationList();
         BuildTopicButtons();