문서 대시보드·DOCX 스타일맵·PPT 골든 회귀를 고도화하고 검증 추가

- ExcelSkill에 summary_sheet 기반 Dashboard 시트 생성을 추가해 Summary -> Dashboard -> Detail 시트 흐름을 지원
- ArtifactQualityReviewService workbook 리뷰에 dashboard 존재 여부를 반영하고 multi-sheet workbook 보완 포인트를 강화
- DocumentAssemblerTool style_map 범위를 cover_subtitle/callout/table_header까지 확장해 템플릿 기반 DOCX 조립 품질을 개선
- Excel/DOCX/PPT 회귀 테스트를 확장하고 PptxSkillGoldenDeckTests를 추가해 strong deck 품질 기준을 고정
- README.md와 docs/DEVELOPMENT.md에 2026-04-14 23:25 (KST) 기준 작업 이력과 검증 명령을 반영

검증 결과
- dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify_doc_next4\\ -p:IntermediateOutputPath=obj\\verify_doc_next4\\ : 경고 0 / 오류 0
- dotnet test src/AxCopilot.Tests/AxCopilot.Tests.csproj -c Release -v minimal --filter ArtifactQualityReviewServiceTests|DocumentAssemblerStyleMapTests|DocumentAssemblerDocxFeaturesTests|DocumentAssemblerSemanticTests|ExcelSkillDashboardSummaryTests|ExcelSkillSummarySheetTests|ExcelSkillExecutiveSummaryLinkTests|ExcelSkillDataValidationTests|ExcelSkillConditionalFormattingTests|HtmlSkillPrintFrameTests|HtmlSkillConsultingSectionsTests|DeckQualityReviewServiceTests|PptxSkillAutoRepairTests|PptxSkillConsultingDeckTests|PptxSkillGoldenDeckTests -p:OutputPath=bin\\verify_doc_next4_tests\\ -p:IntermediateOutputPath=obj\\verify_doc_next4_tests\\ : 통과 20

src/AxCopilot/Services/Agent/ArtifactQualityReviewService.cs

@@ -68,6 +68,7 @@ public sealed record WorkbookReviewInput(
     int DataValidationCount,
     int ConditionalFormattingCount,
     bool HasSummarySheet,
+    bool HasDashboardSheet,
     bool HasHighlightSection,
     bool HasActionSection,
     bool HasScorecardSection,
@@ -197,6 +198,7 @@ public static class ArtifactQualityReviewService
         var issues = new List<ArtifactReviewIssue>();
 
         if (input.HasSummarySheet) strengths.Add("Includes summary sheet");
+        if (input.HasDashboardSheet) strengths.Add("Includes dashboard sheet");
         if (input.DetailSheetCount > 1) strengths.Add($"Contains {input.DetailSheetCount} detail sheets");
         if (input.FormulaCount > 0) strengths.Add($"Includes {input.FormulaCount} formula cell(s)");
         if (input.HyperlinkCount > 0) strengths.Add("Includes navigation links");
@@ -220,6 +222,8 @@ public static class ArtifactQualityReviewService
             issues.Add(new("Conditional formatting is limited for a workbook with enough data to prioritize or flag.", ArtifactReviewSeverity.Info));
         if (input.HasSummarySheet && !input.HasScorecardSection && !input.HasDecisionSection && !input.HasHighlightSection)
             issues.Add(new("Summary sheet could better surface KPIs, decisions, or highlights.", ArtifactReviewSeverity.Info));
+        if (input.HasSummarySheet && input.DetailSheetCount >= 2 && !input.HasDashboardSheet)
+            issues.Add(new("Workbook could benefit from a dashboard sheet to summarize multi-sheet trends.", ArtifactReviewSeverity.Info));
 
         return BuildReport("xlsx", strengths, issues);
     }