코워크 문서 계획/생성 흐름을 claw-code 기준으로 복구

- document_plan 결과에서 body 골격과 후속 생성 도구를 안정적으로 추출하도록 AgentLoop 분기를 수정

- 코워크 문서형 작업은 planMode=off여도 계획 선행(always) 경로를 타도록 보정

- 코워크 시스템 프롬프트를 강화해 계획만 제시하고 끝나지 않고 실제 문서 파일 생성까지 이어지게 조정

- README와 DEVELOPMENT 문서에 2026-04-05 16:02 (KST) 기준 변경 이력 반영

- 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.xaml.cs

@@ -8735,7 +8735,8 @@ public partial class ChatWindow : Window
         sb.AppendLine("You are AX Copilot Agent. You can read, write, and edit files using the provided tools.");
         sb.AppendLine($"Today's date: {DateTime.Now:yyyy년 M월 d일} ({DateTime.Now:yyyy-MM-dd}, {DateTime.Now:dddd}).");
         sb.AppendLine("Available skills: excel_create (.xlsx), docx_create (.docx), csv_create (.csv), markdown_create (.md), html_create (.html), script_create (.bat/.ps1), document_review (품질 검증), format_convert (포맷 변환).");
-        sb.AppendLine("Always explain your plan step by step BEFORE executing tools. After creating files, summarize what was created.");
+        sb.AppendLine("Always produce a concrete execution plan before major Cowork tasks. For document/report/proposal/manual requests, create a 3-7 step plan first, then execute it.");
+        sb.AppendLine("After creating files, summarize what was created and include the actual output path.");
         sb.AppendLine("Do not stop after a single step. Continue autonomously until the request is completed or a concrete blocker (permission denial, missing dependency, hard error) is encountered.");
         sb.AppendLine("When adapting external references, rewrite names/structure/comments to AX Copilot style. Avoid clone-like outputs.");
         sb.AppendLine("IMPORTANT: When creating documents with dates, always use today's actual date above. Never use placeholder or fictional dates.");
@@ -8746,6 +8747,7 @@ public partial class ChatWindow : Window
         sb.AppendLine("  3. Then immediately call html_create (or docx_create/file_write) using the scaffold from document_plan.");
         sb.AppendLine("  4. Write actual detailed content for EVERY section — no skipping, no placeholders, no minimal content.");
         sb.AppendLine("  5. Do NOT call html_create directly without document_plan for multi-section documents.");
+        sb.AppendLine("  6. Do not finish with a plan only. The task is complete only after the document file has actually been created or updated.");
 
         // 문서 품질 검증 루프
         sb.AppendLine("\n## Document Quality Review");