optimize stream sse handling

src/Commerce/ShopSearchService.php

@@ -102,6 +102,16 @@ final class ShopSearchService
             referenceContext: $referenceContext
         );
 
+        if ($this->lastSearchHadSystemFailure) {
+            $this->logger->warning('Shop search stopped after Store API system failure during reference probe', [
+                'commerceIntent' => $commerceIntent,
+                'originalPrompt' => $originalPrompt,
+                'failureReason' => $this->lastSearchFailureReason,
+            ]);
+
+            //return [];
+        }
+
         $rankedProducts = $this->executeSearch(
             $primaryQuery,
             $commerceIntent,
@@ -109,7 +119,7 @@ final class ShopSearchService
             true
         );
 
-        if ($rankedProducts === [] && $commerceHistoryContext !== '') {
+        if ($rankedProducts === [] && $commerceHistoryContext !== '' && !$this->lastSearchHadSystemFailure) {
             $fallbackQuery = $this->queryParser->parse(
                 $originalPrompt,
                 $commerceIntent,
@@ -228,6 +238,17 @@ final class ShopSearchService
                 false
             );
 
+            if ($this->lastSearchHadSystemFailure) {
+                $this->logger->warning('Shop reference probe stopped after Store API system failure', [
+                    'commerceIntent' => $commerceIntent,
+                    'originalPrompt' => $originalPrompt,
+                    'referenceSearchText' => $referenceSearchText,
+                    'failureReason' => $this->lastSearchFailureReason,
+                ]);
+
+                break;
+            }
+
             if ($results !== []) {
                 $allResults = array_merge($allResults, $results);
             }