Continue to work through 429/500s.

- The root of this issue was actually a genai SDK bug that was fixed here: https://critique.corp.google.com/cl/753255997
- Upgrade to latest genai SDK for latest bug fixes (including the above)
- Removed specific 429 handling for uncaught rejections.

Fixes https://b.corp.google.com/issues/413760164

packages/cli/src/gemini.ts

@@ -86,27 +86,6 @@ async function main() {
 
 // --- Global Unhandled Rejection Handler ---
 process.on('unhandledRejection', (reason, _promise) => {
-  // Check if this is the known 429 ClientError that sometimes escapes
-  // this is a workaround for a specific issue with the way we are calling gemini
-  // where a 429 error is thrown but not caught, causing an unhandled rejection
-  // TODO(adh): Remove this when the race condition is fixed
-  const isKnownEscaped429 =
-    reason instanceof Error &&
-    reason.name === 'ClientError' &&
-    reason.message.includes('got status: 429');
-
-  if (isKnownEscaped429) {
-    // Log it differently and DON'T exit, as it's likely already handled visually
-    console.warn('-----------------------------------------');
-    console.warn(
-      'WORKAROUND: Suppressed known escaped 429 Unhandled Rejection.',
-    );
-    console.warn('-----------------------------------------');
-    console.warn('Reason:', reason);
-    return;
-    // No process.exit(1); Don't exit.
-  }
-
   // Log other unexpected unhandled rejections as critical errors
   console.error('=========================================');
   console.error('CRITICAL: Unhandled Promise Rejection!');