compact 이후 컨텍스트 재주입과 일반 작업 최종 보고를 claw-code 스타일로 경량화

- compact boundary가 적용된 query view에 post_compact_context system 메시지를 추가해 복원된 파일/이미지 참조를 짧게 다시 전달함

- 일반 Cowork/Code 작업은 final-report 품질 프롬프트를 3줄 요약 중심으로 줄이고 review/high-impact 작업만 구조적 상세 보고를 유지함

- README.md 및 docs/DEVELOPMENT.md를 2026-04-12 23:14 (KST) 기준으로 갱신함

- 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/Services/Agent/AgentQueryContextBuilder.cs

@@ -22,6 +22,7 @@ public sealed class AgentQueryContextWindowResult
 public static class AgentQueryContextBuilder
 {
     private const int ProtectedRecentNonSystemMessages = 8;
+    private const string PostCompactContextMetaKind = "post_compact_context";
 
     public static AgentQueryContextWindowResult Build(IReadOnlyList<ChatMessage> sourceMessages)
     {
@@ -60,6 +61,9 @@ public static class AgentQueryContextBuilder
             windowMessages.Add(CloneMessage(sourceMessages[i]));
         }
 
+        if (boundaryApplied)
+            InjectPostCompactContextMessage(windowMessages);
+
         var tokensBeforeBudget = TokenEstimator.EstimateMessages(windowMessages);
         var budgetResult = AgentToolResultBudget.Apply(windowMessages, ProtectedRecentNonSystemMessages);
         var tokensAfterBudget = TokenEstimator.EstimateMessages(windowMessages);
@@ -134,4 +138,42 @@ public static class AgentQueryContextBuilder
             }).ToList(),
         };
     }
+
+    private static void InjectPostCompactContextMessage(List<ChatMessage> messages)
+    {
+        if (messages.Count == 0)
+            return;
+
+        if (messages.Any(m => string.Equals(m.MetaKind, PostCompactContextMetaKind, StringComparison.OrdinalIgnoreCase)))
+            return;
+
+        var attachedFiles = messages
+            .SelectMany(m => m.AttachedFiles ?? Enumerable.Empty<string>())
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .Take(5)
+            .ToList();
+        var imageCount = messages.Sum(m => m.Images?.Count ?? 0);
+
+        if (attachedFiles.Count == 0 && imageCount == 0)
+            return;
+
+        var lines = new List<string> { "[post-compact context]" };
+        if (attachedFiles.Count > 0)
+            lines.Add("restored file refs: " + string.Join(", ", attachedFiles));
+        if (imageCount > 0)
+            lines.Add($"restored image refs: {imageCount}");
+
+        var insertIndex = 0;
+        while (insertIndex < messages.Count && string.Equals(messages[insertIndex].Role, "system", StringComparison.OrdinalIgnoreCase))
+            insertIndex++;
+
+        messages.Insert(insertIndex, new ChatMessage
+        {
+            Role = "system",
+            MetaKind = PostCompactContextMetaKind,
+            Content = string.Join("\n", lines),
+            Timestamp = DateTime.Now,
+            AttachedFiles = attachedFiles.Count > 0 ? attachedFiles : null,
+        });
+    }
 }