fix(a2a): Don't throw errors for GeminiEventType Retry and InvalidStream. (#16541)

Co-authored-by: Gal Zahavi <38544478+galz10@users.noreply.github.com>

packages/a2a-server/src/agent/task.ts

@@ -707,6 +707,10 @@ export class Task {
       case GeminiEventType.ModelInfo:
         this.modelInfo = event.value;
         break;
+      case GeminiEventType.Retry:
+      case GeminiEventType.InvalidStream:
+        // An invalid stream should trigger a retry, which requires no action from the user.
+        break;
       case GeminiEventType.Error:
       default: {
         // Block scope for lexical declaration