docs(ai-chat): pin May 6 changelog entry to 0.0.0-chat-prerelease-20260506093419

Author: ericallam

docs/ai-chat/changelog.mdx

@@ -4,7 +4,7 @@ sidebarTitle: "Changelog"
 description: "Pre-release updates for AI chat agents."
 ---
 
-<Update label="May 6, 2026" tags={["SDK", "Breaking"]}>
+<Update label="May 6, 2026" description="0.0.0-chat-prerelease-20260506093419" tags={["SDK", "Breaking"]}>
 
 ## `chat.agent` actions are no longer turns