fix: use web search in SpecsResearchAgent to prevent spec hallucination

The agent was calling generate() — pure model memory — which caused Mistral
to hallucinate specs for older devices (e.g. i5-1135G7 instead of i3-3120M).
generateWithWebSearch() is now used so Mistral queries live sources.

OllamaClientInterface gains generateWithWebSearch(); OllamaClient falls back
to generate() since Ollama has no built-in search tool.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Infrastructure/AI/Agent/SpecsResearchAgent.php

@@ -25,7 +25,7 @@ final class SpecsResearchAgent
             'subject' => $subject,
         ]);
 
-        $result = $this->client->generate($this->model, $prompt);
+        $result = $this->client->generateWithWebSearch($this->model, $prompt);
 
         if ('' === trim($result)) {
             throw new \RuntimeException("No specifications found for model: {$modelName}");

src/Infrastructure/AI/OllamaClient.php

@@ -50,4 +50,9 @@ final class OllamaClient implements OllamaClientInterface
 
         return $data['response'];
     }
+
+    public function generateWithWebSearch(string $model, string $prompt): string
+    {
+        return $this->generate($model, $prompt);
+    }
 }

src/Infrastructure/AI/OllamaClientInterface.php

@@ -9,4 +9,7 @@ interface OllamaClientInterface
     public function generate(string $model, string $prompt): string;
 
     public function generateWithImage(string $model, string $prompt, string $imagePath): string;
+
+    /** Generates with web search if the backend supports it, falls back to generate(). */
+    public function generateWithWebSearch(string $model, string $prompt): string;
 }