claude: fix Windows line endings in foo-engine test regex

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: gordonwoodhull

tests/docs/smoke-all/engine/class-override/_extensions/foo-engine/foo-engine.js

@@ -59,7 +59,7 @@ const fooEngineDiscovery = {
         let markdown = options.target.markdown.value;
 
         // Find and replace {python.foo} blocks with our marker output
-        const codeBlockRegex = /```\{python\.foo[^}]*\}\n([\s\S]*?)```/g;
+        const codeBlockRegex = /```\{python\.foo[^}]*\}\r?\n([\s\S]*?)```/g;
         markdown = markdown.replace(codeBlockRegex, (match, code) => {
           return `
 ::: {#foo-engine-marker .foo-engine-output}