fix: address greptile follow-up

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/adapters/codex-local/src/server/codex-home.ts

@@ -11,7 +11,7 @@ function nonEmpty(value: string | undefined): string | null {
   return typeof value === "string" && value.trim().length > 0 ? value.trim() : null;
 }
 
-async function pathExists(candidate: string): Promise<boolean> {
+export async function pathExists(candidate: string): Promise<boolean> {
   return fs.access(candidate).then(() => true).catch(() => false);
 }