feat: add hallmark design skill

scripts/sync_external_plugins.ps1

@@ -415,6 +415,23 @@ function Compress-ImagesToWebp {
   }
 }
 
+function Update-SkillTextReplacements {
+  param([string]$Root, [object]$Replacements)
+  foreach ($entry in @($Replacements)) {
+    if ($null -eq $entry) { continue }
+    $relative = [string]$entry.path
+    Assert-RelativePathValue -Path $relative
+    $target = Join-Path $Root $relative
+    $old = [string]$entry.old
+    if (-not $old -or $null -eq $entry.new -or -not (Test-Path -LiteralPath $target -PathType Leaf)) {
+      throw "Invalid skillTextReplacements: $relative"
+    }
+    $text = [System.IO.File]::ReadAllText $target
+    if (-not $text.Contains($old)) { throw "skillTextReplacements text not found: $relative : $old" }
+    Write-Utf8NoBomText -Path $target -Text $text.Replace($old, [string]$entry.new)
+  }
+}
+
 function Read-JsonFile {
   param([string]$Path)
   $resolvedPath = (Resolve-Path -LiteralPath $Path).Path
@@ -997,6 +1014,7 @@ function Sync-ClaudeSkill {
   Remove-ReadmeImageReferences -Root $pluginDir -ImagePathPrefixes $Source.readmeImageExcludes
   Remove-ReadmeLines -Root $pluginDir -LineExcludes $Source.readmeLineExcludes
   Compress-ImagesToWebp -Root $skillDest -CompressPaths $Source.webpCompressPaths
+  Update-SkillTextReplacements -Root $skillDest -Replacements $Source.skillTextReplacements
 
   if ($Source.PSObject.Properties.Name -contains "marketAssets" -and $Source.marketAssets) {
     foreach ($asset in @($Source.marketAssets)) {