chore(docs): cache-bust homepage to force fresh render after Fern js-yaml incident

Author: hey-august

fern/products/home/pages/welcome.mdx

@@ -8,6 +8,7 @@ layout: custom
 ---
 
 <Markdown src="/snippets/llms-hint.mdx" />
+{/* cache-bust 2026-08-05: force fresh render after Fern js-yaml incident */}
 
 <div class="lp-page-container">
   <div class="main-content">