스킬 런타임 2차 고도화와 도구 노출 필터 정비

프로젝트 .claude/skills 재귀 로드와 namespaced SKILL.md 파싱을 추가하고 번들/사용자/프로젝트 스킬을 함께 노출하도록 SkillService와 설정 UI를 확장했다.

슬래시 스킬 호출 시 인자 치환, 스킬 폴더 변수 치환, inline shell 실행, when_to_use 기반 자동 스킬 가이드를 실제 ChatWindow 런타임 경로에 연결했다.

blanket deny 권한은 모델 노출 전 활성 도구 목록에서 먼저 제외하도록 AgentLoopService를 보강했고 관련 테스트와 README/DEVELOPMENT 문서를 업데이트했다.

검증: dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify_phase2\\ -p:IntermediateOutputPath=obj\\verify_phase2\\ (경고 0 / 오류 0)
검증: dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter "AgentToolCatalogTests|SkillServiceRuntimePolicyTests" -p:OutputPath=bin\\verify_phase2_tests\\ -p:IntermediateOutputPath=obj\\verify_phase2_tests\\ (통과 16, 기존 WorkspaceContextGeneratorTests nullable 경고 1건 유지)

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -524,7 +524,7 @@ public partial class ChatWindow : Window
             if (_settings.Settings.Llm.EnableSkillSystem)
             {
                 SkillService.EnsureSkillFolder();
-                SkillService.LoadSkills(_settings.Settings.Llm.SkillsFolderPath);
+                SkillService.LoadSkills(_settings.Settings.Llm.SkillsFolderPath, GetCurrentWorkFolder());
                 UpdateConditionalSkillActivation(reset: true);
             }
 
@@ -2241,6 +2241,15 @@ public partial class ChatWindow : Window
         return _settings.Settings.Llm.WorkFolder;
     }
 
+    private void EnsureSkillSystemLoadedForCurrentWorkspace()
+    {
+        if (!_settings.Settings.Llm.EnableSkillSystem)
+            return;
+
+        SkillService.EnsureSkillFolder();
+        SkillService.LoadSkills(_settings.Settings.Llm.SkillsFolderPath, GetCurrentWorkFolder());
+    }
+
     /// <summary>
     /// 현재 작업 컨텍스트(첨부 파일 + 작업 폴더) 기준으로
     /// 조건부 paths 스킬 활성화를 갱신합니다.
@@ -2248,6 +2257,7 @@ public partial class ChatWindow : Window
     private void UpdateConditionalSkillActivation(bool reset = 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();
@@ -3460,6 +3470,7 @@ public partial class ChatWindow : Window
             // 스킬 슬래시 명령어 매칭 (탭별 필터)
             if (_settings.Settings.Llm.EnableSkillSystem)
             {
+                EnsureSkillSystemLoadedForCurrentWorkspace();
                 var skillMatches = SkillService.MatchSlashCommand(text)
                     .Where(s => s.IsVisibleInTab(_activeTab))
                     .Select(s => (Cmd: "/" + s.Name,
@@ -3518,7 +3529,7 @@ public partial class ChatWindow : Window
     }
 
     /// <summary>슬래시 명령어를 감지하여 시스템 프롬프트와 사용자 텍스트를 분리합니다.</summary>
-    private (string? slashSystem, string userText) ParseSlashCommand(string input)
+    private async Task<(string? slashSystem, string userText)> ParseSlashCommandAsync(string input, CancellationToken ct = default)
     {
         var trimmed = input.TrimStart();
         if (trimmed.StartsWith("/"))
@@ -3535,17 +3546,10 @@ public partial class ChatWindow : Window
         }
 
         // 스킬 명령어 매칭
-        var matchedSkill = SkillService.MatchSlashInvocation(input);
-        if (matchedSkill != null)
-        {
-            var slashCmd = "/" + matchedSkill.Name;
-            var rest = input[slashCmd.Length..].Trim();
-            var runtimePolicy = SkillService.BuildRuntimeDirective(matchedSkill);
-            var mergedPrompt = string.IsNullOrWhiteSpace(runtimePolicy)
-                ? matchedSkill.SystemPrompt
-                : $"{matchedSkill.SystemPrompt}\n\n{runtimePolicy}";
-            return (mergedPrompt, string.IsNullOrEmpty(rest) ? matchedSkill.Label : rest);
-        }
+        EnsureSkillSystemLoadedForCurrentWorkspace();
+        var compiledInvocation = await SkillService.BuildSlashInvocationAsync(input, GetCurrentWorkFolder(), ct);
+        if (compiledInvocation != null)
+            return (compiledInvocation.SystemPrompt, compiledInvocation.DisplayText);
 
         return (null, input);
     }
@@ -5004,7 +5008,7 @@ public partial class ChatWindow : Window
         {
             llm.EnableSkillSystem = true;
             SkillService.EnsureSkillFolder();
-            SkillService.LoadSkills(llm.SkillsFolderPath);
+            SkillService.LoadSkills(llm.SkillsFolderPath, GetCurrentWorkFolder());
             UpdateConditionalSkillActivation(reset: true);
             ScheduleSettingsSave();
             _appState.LoadFromSettings(_settings);
@@ -5102,7 +5106,17 @@ public partial class ChatWindow : Window
         ClearPromptCardPlaceholder();
 
         // 슬래시 명령어 처리
-        var (slashSystem, displayText) = ParseSlashCommand(text);
+        var (slashSystem, displayText) = await ParseSlashCommandAsync(text, CancellationToken.None);
+
+        if (slashSystem == null
+            && _settings.Settings.Llm.EnableSkillSystem
+            && !text.TrimStart().StartsWith("/", StringComparison.Ordinal))
+        {
+            EnsureSkillSystemLoadedForCurrentWorkspace();
+            var autoSkillPrompt = await SkillService.BuildProactiveSkillSystemPromptAsync(displayText, _activeTab, GetCurrentWorkFolder(), CancellationToken.None);
+            if (!string.IsNullOrWhiteSpace(autoSkillPrompt))
+                slashSystem = autoSkillPrompt;
+        }
 
         if (string.Equals(slashSystem, "__CLEAR__", StringComparison.Ordinal))
         {