refactor: update fabric package detection and remove comments

Author: OskarStark

examples/fabric/summarize.php

@@ -15,19 +15,16 @@
     exit(1);
 }
 
-// Check if Fabric patterns package is installed
 if (!is_dir(dirname(__DIR__, 2).'/vendor/php-llm/fabric-pattern')) {
     echo 'Fabric patterns are not installed.'.\PHP_EOL;
     echo 'Please install them with: composer require php-llm/fabric-pattern'.\PHP_EOL;
     exit(1);
 }
 
-// Initialize platform and model
 $platform = PlatformFactory::create($_ENV['OPENAI_API_KEY']);
 $model = new GPT(GPT::GPT_4O_MINI);
 $chain = new Chain($platform, $model);
 
-// Example article to summarize
 $article = <<<'ARTICLE'
     The field of artificial intelligence has undergone dramatic transformations in recent years,
     with large language models (LLMs) emerging as one of the most significant breakthroughs.
@@ -41,13 +38,11 @@
     potential harms.
     ARTICLE;
 
-// Create messages using Fabric pattern
 $messages = new MessageBag(
     Message::fabric('create_summary'),
     Message::ofUser($article)
 );
 
-// Call the chain
 $response = $chain->call($messages);
 
 echo 'Summary using Fabric pattern "create_summary":'.\PHP_EOL;

src/Platform/Fabric/FabricRepository.php

@@ -21,8 +21,8 @@ class FabricRepository
     public function __construct(?string $patternsPath = null)
     {
         if (null === $patternsPath) {
-            // Check if fabric-pattern package is installed by checking for its Pattern class
-            if (!class_exists(\PhpLlm\FabricPattern\Pattern::class)) {
+            // Check if Fabric patterns package is installed
+            if (!is_dir(\dirname(__DIR__, 2).'/vendor/php-llm/fabric-pattern')) {
                 throw new \RuntimeException('Fabric patterns not found. Please install the "php-llm/fabric-pattern" package: composer require php-llm/fabric-pattern');
             }