fix: add retry delay when response.ok is false in ensureServerReady

When the health check returns an error status (401, 500, etc.), the loop
was immediately continuing to the next attempt without any delay. This
caused up to 5 rapid-fire requests in quick succession. The delay was
only being applied for the 'upgrading' status case.

Now applies the same UPGRADE_RETRY_DELAY_MS delay before retrying when
the response is not ok, consistent with the upgrading case.

Co-authored-by: Aiden Bai <aidenybai@users.noreply.github.com>

Author: cursoragent

packages/relay/src/client.ts

@@ -110,7 +110,12 @@ export const createRelayClient = (
     for (let attempt = 0; attempt < MAX_UPGRADE_RETRIES; attempt++) {
       try {
         const response = await fetch(healthUrl);
-        if (!response.ok) continue;
+        if (!response.ok) {
+          await new Promise((resolve) =>
+            setTimeout(resolve, UPGRADE_RETRY_DELAY_MS),
+          );
+          continue;
+        }
 
         const data = (await response.json()) as { status: string };
         if (data.status === "upgrading") {