story(vol04): 完成69至88章与第四卷阅读包

tools/validate-project.ps1

@@ -309,6 +309,17 @@ $thirdOutlineIds = @([regex]::Matches($thirdOutline, '(?m)^\| (\d+) \|') | ForEa
 if (($thirdOutlineIds -join ',') -ne ($thirdVolumeIds -join ',')) {
     $failures.Add('Volume three chapter outline and prose IDs differ')
 }
+$fourthVolumeIds = @($novelFiles | Where-Object { $_.Directory.Name -eq '第四卷' } | ForEach-Object { [int]$_.Name.Substring(0, 2) } | Sort-Object)
+if ($fourthVolumeIds.Count -gt 0) {
+    if (($fourthVolumeIds -join ',') -ne ((69..88) -join ',')) {
+        $failures.Add('Completed volume four must contain chapters 69-88')
+    }
+    $fourthOutline = Read-ProjectText '05_小说创作/02_章节大纲/第四卷_章节大纲.md'
+    $fourthOutlineIds = @([regex]::Matches($fourthOutline, '(?m)^\| (\d+) \|') | ForEach-Object { [int]$_.Groups[1].Value })
+    if (($fourthOutlineIds -join ',') -ne ($fourthVolumeIds -join ',')) {
+        $failures.Add('Volume four chapter outline and prose IDs differ')
+    }
+}
 foreach ($legacy in @(
     '06_AI动漫制作/03_分镜与镜头/01_镜头表/S01E01_SC12_75秒试片镜头表.md',
     '06_AI动漫制作/04_生成方案/01_图像提示词/S01E01_SC12_关键帧提示词.md',