bug #358 [AIBundle] Fix single agent alias (Guikingone)

This PR was merged into the main branch.

Discussion
----------

[AIBundle] Fix single agent alias

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Docs?         | no
| Issues        | Fix #355
| License       | MIT

Small fix related to agent injection.

Commits
-------

bbcf491 fix(aibundle): agent alias rollback

Author: OskarStark

src/ai-bundle/src/AiBundle.php

@@ -112,6 +112,9 @@ public function loadExtension(array $config, ContainerConfigurator $container, C
         foreach ($config['agent'] as $agentName => $agent) {
             $this->processAgentConfig($agentName, $agent, $builder);
         }
+        if (1 === \count($config['agent']) && isset($agentName)) {
+            $builder->setAlias(AgentInterface::class, 'ai.agent.'.$agentName);
+        }
 
         foreach ($config['store'] ?? [] as $type => $store) {
             $this->processStoreConfig($type, $store, $builder);

src/ai-bundle/tests/DependencyInjection/AiBundleTest.php

@@ -46,6 +46,7 @@ public function testInjectionAgentAliasIsRegistered()
             ],
         ]);
 
+        $this->assertTrue($container->hasAlias('Symfony\AI\Agent\AgentInterface'));
         $this->assertTrue($container->hasAlias('Symfony\AI\Agent\AgentInterface $myAgentAgent'));
     }