fix: restore max_output_tokens error handling

src/ai/message-handlers.ts

@@ -166,6 +166,15 @@ function handleStructuredError(
           false // Not retryable - needs code fix
         ),
       };
+    case 'max_output_tokens':
+      return {
+        detected: true,
+        shouldThrow: new PentestError(
+          `Max output tokens reached: ${content.slice(0, 100)}`,
+          'billing',
+          true // Retryable - may succeed with different content
+        ),
+      };
     case 'unknown':
     default:
       return { detected: true };

src/ai/types.ts

@@ -73,6 +73,7 @@ export type SDKAssistantMessageError =
   | 'rate_limit'
   | 'invalid_request'
   | 'server_error'
+  | 'max_output_tokens'
   | 'unknown';
 
 export interface AssistantMessage {