refactor: simplify Fabric integration by using Pattern class directly

- Remove FabricRepository, FabricPrompt, FabricPromptInterface
- Remove PatternNotFoundException
- Remove support for custom pattern paths
- Use php-llm/fabric-pattern's Pattern class directly
- Update tests to match new implementation
- Update README to remove custom pattern location docs

Author: OskarStark

README.md

@@ -920,6 +920,27 @@ $response = $chain->call([
 ]);
 ```
 
+#### Usage with Input Processor
+
+For more flexibility, you can use the `FabricInputProcessor` to dynamically load patterns:
+
+```php
+use PhpLlm\LlmChain\Chain\Chain;
+use PhpLlm\LlmChain\Platform\Fabric\FabricInputProcessor;
+
+// Initialize Platform and LLM
+
+$processor = new FabricInputProcessor();
+$chain = new Chain($platform, $model, [$processor]);
+
+$messages = new MessageBag(
+    Message::ofUser('Analyze this article for potential security issues: ...')
+);
+
+// Use any Fabric pattern via options
+$response = $chain->call($messages, ['fabric_pattern' => 'analyze_threat_report']);
+```
+
 #### Available Patterns
 
 Some popular patterns include:

src/Platform/Fabric/Exception/PatternNotFoundException.php

@@ -4,6 +4,7 @@
 
 namespace PhpLlm\LlmChain\Platform\Fabric;
 
+use PhpLlm\FabricPattern\Pattern;
 use PhpLlm\LlmChain\Chain\Input;
 use PhpLlm\LlmChain\Chain\InputProcessorInterface;
 use PhpLlm\LlmChain\Platform\Message\SystemMessage;
@@ -16,11 +17,6 @@
  */
 final readonly class FabricInputProcessor implements InputProcessorInterface
 {
-    public function __construct(
-        private FabricRepository $repository = new FabricRepository(),
-    ) {
-    }
-
     public function processInput(Input $input): void
     {
         $options = $input->getOptions();
@@ -39,9 +35,14 @@ public function processInput(Input $input): void
             throw new \LogicException('Cannot add Fabric pattern: MessageBag already contains a system message');
         }
 
+        // Check if fabric-pattern package is installed
+        if (!class_exists(Pattern::class)) {
+            throw new \RuntimeException('Fabric patterns not found. Please install the "php-llm/fabric-pattern" package: composer require php-llm/fabric-pattern');
+        }
+
         // Load the pattern and prepend as system message
-        $fabricPrompt = $this->repository->load($pattern);
-        $systemMessage = new SystemMessage($fabricPrompt->getContent());
+        $content = (new Pattern())->load($pattern);
+        $systemMessage = new SystemMessage($content);
 
         // Prepend the system message
         $input->messages = $input->messages->prepend($systemMessage);

src/Platform/Fabric/FabricInputProcessor.php

@@ -4,7 +4,7 @@
 
 namespace PhpLlm\LlmChain\Platform\Message;
 
-use PhpLlm\LlmChain\Platform\Fabric\FabricRepository;
+use PhpLlm\FabricPattern\Pattern;
 use PhpLlm\LlmChain\Platform\Message\Content\ContentInterface;
 use PhpLlm\LlmChain\Platform\Message\Content\Text;
 use PhpLlm\LlmChain\Platform\Response\ToolCall;
@@ -33,16 +33,17 @@ public static function forSystem(\Stringable|string $content): SystemMessage
      * Note: Only one SystemMessage is supported per MessageBag. If you need to use
      * a Fabric pattern with an existing SystemMessage, you'll need to combine them manually.
      *
-     * @param string|null $patternsPath Optional custom patterns path
-     *
      * @throws \RuntimeException if fabric-pattern package is not installed
      */
-    public static function fabric(string $pattern, ?string $patternsPath = null): SystemMessage
+    public static function fabric(string $pattern): SystemMessage
     {
-        $repository = new FabricRepository($patternsPath);
-        $fabricPrompt = $repository->load($pattern);
+        if (!class_exists(Pattern::class)) {
+            throw new \RuntimeException('Fabric patterns not found. Please install the "php-llm/fabric-pattern" package: composer require php-llm/fabric-pattern');
+        }
+
+        $content = (new Pattern())->load($pattern);
 
-        return new SystemMessage($fabricPrompt->getContent());
+        return new SystemMessage($content);
     }
 
     /**