claude-code 기준 provider 호환성과 compact 후속 흐름을 보강한다

- OpenAI 호환 tool_choice 400 오류에 대한 일반 fallback을 추가하고 Qwen·LLaMA·DeepSeek 계열 vLLM의 도구 호출 프로파일을 더 보수적으로 조정

- compact 이후 branch context와 최근 tool state를 query view에 재주입하고 UI 표현 수준에 맞춰 compact 카드/컨텍스트 사용 팝업/최종 보고 밀도를 세분화

- README와 DEVELOPMENT 문서 이력을 2026-04-12 23:45 KST 기준으로 갱신

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

src/AxCopilot/Views/ChatWindow.ContextUsagePresentation.cs

@@ -6,7 +6,7 @@ namespace AxCopilot.Views;
 
 public partial class ChatWindow
 {
-    // 토큰 추정 캐시: 메시지 수나 대화 ID가 달라질 때만 재계산
+    // 메시지 개수와 대화 ID가 바뀔 때만 재계산한다.
     private int _cachedMessageTokens;
     private int _cachedMessageCountForTokens = -1;
     private string? _cachedConvIdForTokens;
@@ -28,6 +28,7 @@ public partial class ChatWindow
         }
 
         var llm = _settings.Settings.Llm;
+        var expressionLevel = GetAgentUiExpressionLevel();
         var maxContextTokens = Math.Clamp(llm.MaxContextTokens, 1024, 1_000_000);
         var triggerPercent = Math.Clamp(llm.ContextCompactTriggerPercent, 10, 95);
         var triggerRatio = triggerPercent / 100.0;
@@ -45,6 +46,7 @@ public partial class ChatWindow
                 _cachedConvIdForTokens = convId;
                 _cachedMessageCountForTokens = msgCount;
             }
+
             messageTokens = _cachedMessageTokens;
         }
 
@@ -52,7 +54,7 @@ public partial class ChatWindow
         var draftTokens = string.IsNullOrWhiteSpace(draftText) ? 0 : Services.TokenEstimator.Estimate(draftText) + 4;
 
         var hasAnyMessages = messageTokens > 0 || _isStreaming;
-        int baseOverhead = 0;
+        var baseOverhead = 0;
         if (hasAnyMessages)
         {
             var sysPromptLen = _llm?.SystemPrompt?.Length ?? 0;
@@ -118,11 +120,21 @@ public partial class ChatWindow
         if (TokenUsagePopupUsage != null)
             TokenUsagePopupUsage.Text = $"{Services.TokenEstimator.Format(currentTokens)}/{Services.TokenEstimator.Format(maxContextTokens)}";
         if (TokenUsagePopupDetail != null)
-            TokenUsagePopupDetail.Text = detailText;
+            TokenUsagePopupDetail.Text = expressionLevel == "simple"
+                ? detailText
+                : $"{detailText} · 임계 {triggerPercent}%";
         if (TokenUsagePopupCompact != null)
+        {
             TokenUsagePopupCompact.Text = _sessionCompactionCount > 0
-                ? $"누적 압축 {_sessionCompactionCount}회 · 절감 {FormatTokenCount(_sessionCompactionSavedTokens)}"
-                : "AX Agent가 컨텍스트를 자동 관리합니다";
+                ? expressionLevel switch
+                {
+                    "simple" => $"압축 {_sessionCompactionCount}회 · {FormatTokenCount(_sessionCompactionSavedTokens)} 절감",
+                    _ => $"누적 압축 {_sessionCompactionCount}회 · 절감 {FormatTokenCount(_sessionCompactionSavedTokens)}"
+                }
+                : expressionLevel == "rich"
+                    ? "AX Agent가 컨텍스트를 자동 관리합니다"
+                    : "컨텍스트 자동 관리";
+        }
 
         TokenUsageCard.ToolTip = null;
 

src/AxCopilot/Views/ChatWindow.TimelinePresentation.cs

@@ -350,6 +350,7 @@ public partial class ChatWindow
 
     private Border CreateCompactionMetaCard(ChatMessage message, Brush primaryText, Brush secondaryText, Brush hintBg, Brush borderBrush, Brush accentBrush)
     {
+        var expressionLevel = GetAgentUiExpressionLevel();
         var icon = "\uE9CE";
         var title = message.MetaKind switch
         {
@@ -399,20 +400,40 @@ public partial class ChatWindow
         };
 
         var detailBits = new List<string>();
-        if (message.AttachedFiles?.Count > 0)
+        if (message.AttachedFiles?.Count > 0 && expressionLevel != "simple")
             detailBits.Add($"파일 {message.AttachedFiles.Count}개");
-        var compactDetail = detailBits.Count > 0
-            ? $"{summary} · {string.Join(", ", detailBits)}"
-            : summary;
+        var compactDetail = expressionLevel switch
+        {
+            "simple" => summary,
+            _ when detailBits.Count > 0 => $"{summary} · {string.Join(", ", detailBits)}",
+            _ => summary
+        };
 
         stack.Children.Add(new TextBlock
         {
             Text = compactDetail,
-            FontSize = 10.5,
+            FontSize = expressionLevel == "simple" ? 10 : 10.5,
             Foreground = secondaryText,
             TextWrapping = TextWrapping.Wrap,
         });
 
+        if (expressionLevel == "rich" && !string.IsNullOrWhiteSpace(message.Content))
+        {
+            var preview = message.Content.Trim();
+            if (preview.Length > 120)
+                preview = preview[..120] + "...";
+
+            stack.Children.Add(new TextBlock
+            {
+                Text = preview,
+                FontSize = 10,
+                Foreground = secondaryText,
+                Opacity = 0.88,
+                Margin = new Thickness(0, 6, 0, 0),
+                TextWrapping = TextWrapping.Wrap,
+            });
+        }
+
         wrapper.Child = stack;
         return wrapper;
     }