debug: page-level file logging

src/app/client/[token]/page.tsx

@@ -90,7 +90,8 @@ export default async function ClientPage({
   params: Promise<{ token: string }>;
 }) {
   const { token } = await params;
-  console.log("[ClientPage] token param:", token);
+  const { appendFileSync } = await import("fs");
+  appendFileSync("/tmp/clienthub-debug.log", `[${new Date().toISOString()}] PAGE token=${token}\n`);
 
   const clientData = await getCachedClientData(token);
   if (!clientData) notFound();