fix retrieve final technical questions

src/Intent/CommerceIntentLite.php

@@ -40,6 +40,14 @@ final class CommerceIntentLite
             );
         }
 
+        if ($this->isTechnicalFactualKnowledgeQuery($prompt) && !$this->hasExplicitCommerceIntent($prompt)) {
+            return $this->buildDetectionResult(
+                intent: self::NONE,
+                score: 0,
+                signals: ['technical_factual_knowledge_query']
+            );
+        }
+
         $score = 0;
         $signals = [];
 
@@ -87,6 +95,49 @@ final class CommerceIntentLite
         return $this->matchesAnyPattern($prompt, $this->config->getExplicitCommerceIntentPatterns());
     }
 
+    /**
+     * Detects factual technical knowledge questions that must stay in RAG retrieval.
+     *
+     * Product names such as Testomat can look like commerce queries, but questions
+     * about limits, measuring ranges, thresholds, resolution or monitoring values
+     * must not trigger shop search. Shop search may still run when the user uses
+     * explicit commerce wording such as price, buy, order, shop, article or SKU.
+     */
+    private function isTechnicalFactualKnowledgeQuery(string $prompt): bool
+    {
+        $hasQuestionMarker = $this->matchesAnyPattern($prompt, [
+            '/\bwas\s+ist\b/u',
+            '/\bwelche?r?s?\b/u',
+            '/\bwie\s+(hoch|niedrig|klein|gross|groß)\b/u',
+            '/\bniedrigste[rsn]?\b/u',
+            '/\bkleinste[rsn]?\b/u',
+            '/\bhöchste[rsn]?\b/u',
+            '/\bhoechste[rsn]?\b/u',
+        ]);
+
+        if (!$hasQuestionMarker) {
+            return false;
+        }
+
+        return $this->matchesAnyPattern($prompt, [
+            '/\bgrenzwert(?:e|en|es)?\b/u',
+            '/\bmessbereich(?:e|en|s)?\b/u',
+            '/\bwasserhärte\b/u',
+            '/\bwasserhaerte\b/u',
+            '/\bresthärte\b/u',
+            '/\bresthaerte\b/u',
+            '/\bgesamthärte\b/u',
+            '/\bgesamthaerte\b/u',
+            '/\bauflösung\b/u',
+            '/\baufloesung\b/u',
+            '/\bindikator(?:en|s)?\b/u',
+            '/\btestomat(?:en|s)?\b/u',
+            '/\büberwach(?:t|en|ung)\b/u',
+            '/\bueberwach(?:t|en|ung)\b/u',
+            '/\bmess(?:en|ung|bar|wert)\b/u',
+        ]);
+    }
+
     /**
      * @param string[] $patterns
      */