fix shop research intent

src/Intent/CommerceIntentLite.php

@@ -40,7 +40,11 @@ final class CommerceIntentLite
             );
         }
 
-        if ($this->isTechnicalFactualKnowledgeQuery($prompt) && !$this->hasExplicitCommerceIntent($prompt)) {
+        if (
+            $this->isTechnicalFactualKnowledgeQuery($prompt)
+            && !$this->hasExplicitCommerceIntent($prompt)
+            && !$this->hasAdvisoryProductSelectionIntent($prompt)
+        ) {
             return $this->buildDetectionResult(
                 intent: self::NONE,
                 score: 0,
@@ -95,6 +99,81 @@ final class CommerceIntentLite
         return $this->matchesAnyPattern($prompt, $this->config->getExplicitCommerceIntentPatterns());
     }
 
+    /**
+     * Product advisory prompts can contain technical words such as "Messung".
+     *
+     * They must not be swallowed by the factual RAG guard when the user is
+     * clearly asking for a suitable shop product or device class.
+     */
+    private function hasAdvisoryProductSelectionIntent(string $prompt): bool
+    {
+        if (!$this->containsConfiguredAdvisorySignal($prompt)) {
+            return false;
+        }
+
+        if (preg_match($this->config->getModelLikeProductPattern(), $prompt) === 1) {
+            return true;
+        }
+
+        foreach ($this->config->getStrongSignalsList() as $signal) {
+            $signal = mb_strtolower(trim($signal));
+
+            if ($signal === '' || $this->isNonProductCommerceSignal($signal)) {
+                continue;
+            }
+
+            if (str_contains($prompt, $signal)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function containsConfiguredAdvisorySignal(string $prompt): bool
+    {
+        foreach ($this->config->getAdvisorySignals() as $signal) {
+            if ($this->containsConfiguredPhraseOrToken($prompt, $signal)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function containsConfiguredPhraseOrToken(string $prompt, string $signal): bool
+    {
+        $signal = mb_strtolower(trim($signal));
+
+        if ($signal === '') {
+            return false;
+        }
+
+        if (preg_match('/\s/u', $signal) === 1) {
+            return str_contains($prompt, $signal);
+        }
+
+        $pattern = '/(?<![\p{L}\p{N}])' . preg_quote($signal, '/') . '(?![\p{L}\p{N}])/u';
+
+        return preg_match($pattern, $prompt) === 1;
+    }
+
+    private function isNonProductCommerceSignal(string $signal): bool
+    {
+        return in_array($signal, [
+            'shop',
+            'alle',
+            'kunde',
+            'online',
+            'kaufen',
+            'kostet',
+            'suche',
+            'such',
+            'finde',
+            'finden',
+        ], true);
+    }
+
     /**
      * Detects factual technical knowledge questions that must stay in RAG retrieval.
      *
@@ -255,7 +334,7 @@ final class CommerceIntentLite
     private function applyAdvisorySignals(string $prompt, int $score, array $signals): array
     {
         foreach ($this->config->getAdvisorySignals() as $signal) {
-            if (str_contains($prompt, mb_strtolower($signal))) {
+            if ($this->containsConfiguredPhraseOrToken($prompt, $signal)) {
                 $score += $this->config->getAdvisorySignalScore();
                 $signals[] = $this->config->getAdvisorySignalPrefix() . $signal;
             }