add transformer pattern & rest transformer for API (#58388)

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

src/content-render/liquid/engine.ts

@@ -10,6 +10,7 @@ import { Tool, tags as toolTags } from './tool'
 import { Spotlight, tags as spotlightTags } from './spotlight'
 import { Prompt } from './prompt'
 import IndentedDataReference from './indented-data-reference'
+import { apiTransformerTags } from '@/article-api/liquid-renderers'
 
 // Type assertions for .js files without type definitions
 // Copilot: Remove these assertions when the corresponding .js files are converted to TypeScript
@@ -40,6 +41,11 @@ for (const tag in spotlightTags) {
 
 engine.registerTag('prompt', anyPrompt)
 
+// Register API transformer tags
+for (const [tagName, tagClass] of Object.entries(apiTransformerTags)) {
+  engine.registerTag(tagName, tagClass as any)
+}
+
 /**
  * Like the `size` filter, but specifically for
  * getting the number of keys in an object