fix: 修复DOCX独立封面视觉门禁

统一 Chromium 与 DOCX 的受限高度封面布局，补齐可编辑边框、装饰边和 Office 页面舍入适配。

按四套独立封面主题、纵横方向及五组页边距执行 40 个 Word/WPS 真实视觉场景，严格失败为 0，并保留正文诊断供 D4 修复。

scripts/verify-docx-layout-visual-matrix.mjs

@@ -58,9 +58,13 @@ const matrixDefinition = summarizeDocxLayoutVisualMatrix(
 
 const selectedCaseId =
   process.env.MD_TO_PDF_LAYOUT_VISUAL_CASE?.trim() || undefined;
+const selectedScope =
+  process.env.MD_TO_PDF_LAYOUT_VISUAL_SCOPE?.trim() || "full";
 const selectedCases = selectedCaseId
   ? cases.filter((entry) => entry.id === selectedCaseId)
-  : cases;
+  : selectedScope === "cover"
+    ? cases.filter((entry) => entry.coverPageCount > 0)
+    : cases;
 
 function assert(condition, message) {
   if (!condition) {
@@ -287,6 +291,17 @@ function reportGateFailures(report, label) {
   return failures;
 }
 
+function reportCoverGateFailures(report, label) {
+  return getBlockingVisualDiffIssues(report)
+    .filter(
+      (issue) =>
+        issue.code === "COVER_LAYOUT_MISMATCH" ||
+        issue.baselinePageNumber === 1 ||
+        issue.candidatePageNumber === 1
+    )
+    .map((issue) => `${label}: ${issue.code} - ${issue.message}`);
+}
+
 function reportSummary(report) {
   const paragraphIssues = report.basic.paragraphLayouts?.flatMap(
     (paragraph) => paragraph.issues
@@ -462,6 +477,10 @@ assert(
   selectedCases.length > 0,
   `视觉矩阵用例不存在：${selectedCaseId}`
 );
+assert(
+  selectedScope === "full" || selectedScope === "cover",
+  `不支持的视觉矩阵作用域：${selectedScope}`
+);
 const wordAdapter = createWordPdfAdapter({ timeoutMs: 240_000 });
 const wpsAdapter = createWpsPdfAdapter({ timeoutMs: 240_000 });
 const wordCapability = await wordAdapter.probe();
@@ -471,6 +490,7 @@ assert(wpsCapability.available, `WPS Writer 不可用：${wpsCapability.detail}`
 
 const summaries = [];
 const gateFailures = [];
+const diagnosticFailures = [];
 for (const caseDefinition of selectedCases) {
   process.stderr.write(`[layout visual matrix] ${caseDefinition.id}\n`);
   const { caseDirectory, result } = await generateCase(caseDefinition);
@@ -569,7 +589,7 @@ for (const caseDefinition of selectedCases) {
   writeReportArtifacts(rasterDirectory, "wps", wpsReport);
   writeReportArtifacts(rasterDirectory, "office", officeReport);
 
-  const currentFailures = [...new Set([
+  const allCurrentFailures = [...new Set([
     ...pageGeometryFailures(chromium, caseDefinition, "Chromium"),
     ...pageGeometryFailures(word, caseDefinition, "Microsoft Word"),
     ...pageGeometryFailures(wps, caseDefinition, "WPS Writer"),
@@ -589,9 +609,19 @@ for (const caseDefinition of selectedCases) {
     ...reportGateFailures(wpsReport, "Chromium/WPS"),
     ...reportGateFailures(officeReport, "Word/WPS")
   ])];
+  const currentFailures = selectedScope === "cover"
+    ? [...new Set([
+        ...reportCoverGateFailures(wordReport, "Chromium/Word"),
+        ...reportCoverGateFailures(wpsReport, "Chromium/WPS"),
+        ...reportCoverGateFailures(officeReport, "Word/WPS")
+      ])]
+    : allCurrentFailures;
   gateFailures.push(
     ...currentFailures.map((failure) => `${caseDefinition.id}: ${failure}`)
   );
+  diagnosticFailures.push(
+    ...allCurrentFailures.map((failure) => `${caseDefinition.id}: ${failure}`)
+  );
   summaries.push({
     id: caseDefinition.id,
     themeId: caseDefinition.themeId,
@@ -623,6 +653,7 @@ for (const caseDefinition of selectedCases) {
       office: reportSummary(officeReport)
     },
     gateFailures: currentFailures,
+    diagnosticFailures: allCurrentFailures,
     files: {
       chromiumPdf: path.relative(repositoryDirectory, chromiumPdfPath),
       docx: path.relative(repositoryDirectory, docxPath),
@@ -638,8 +669,13 @@ const summary = {
   generatedAt: new Date().toISOString(),
   matrixDefinition,
   selectedCaseId,
+  selectedScope,
   execution: {
-    mode: selectedCaseId ? "single-case" : "full-matrix",
+    mode: selectedCaseId
+      ? "single-case"
+      : selectedScope === "cover"
+        ? "cover-matrix"
+        : "full-matrix",
     executedCaseCount: summaries.length,
     expectedFullMatrixCaseCount: matrixDefinition.expectedCaseCount,
     complete: !selectedCaseId && summaries.length === matrixDefinition.expectedCaseCount
@@ -650,15 +686,24 @@ const summary = {
   caseCount: summaries.length,
   gatePassed: gateFailures.length === 0,
   gateFailures,
+  diagnosticFailures,
   cases: summaries
 };
 const summaryPath = path.join(
   outputDirectory,
-  selectedCaseId ? `summary-${selectedCaseId}.json` : "summary.json"
+  selectedCaseId
+    ? `summary-${selectedCaseId}.json`
+    : selectedScope === "cover"
+      ? "summary-cover.json"
+      : "summary.json"
 );
 const matrixHtmlPath = path.join(
   outputDirectory,
-  selectedCaseId ? `matrix-${selectedCaseId}.html` : "matrix.html"
+  selectedCaseId
+    ? `matrix-${selectedCaseId}.html`
+    : selectedScope === "cover"
+      ? "matrix-cover.html"
+      : "matrix.html"
 );
 fs.writeFileSync(summaryPath, `${JSON.stringify(summary, null, 2)}\n`, "utf8");
 fs.writeFileSync(matrixHtmlPath, renderMatrixSummaryHtml(summary), "utf8");