Add PHPDoc descriptions for all MultiAgent constructor parameters

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Co-Authored-By: Claude <[email protected]>

Author: OskarStark

src/agent/src/MultiAgent/MultiAgent.php

@@ -34,8 +34,10 @@
 final class MultiAgent implements AgentInterface
 {
     /**
-     * @param Handoff[]           $handoffs Handoff definitions for agent routing
-     * @param non-empty-string    $name     Name of the multi-agent
+     * @param AgentInterface      $orchestrator Agent responsible for analyzing requests and selecting appropriate handoffs
+     * @param Handoff[]           $handoffs     Handoff definitions for agent routing
+     * @param non-empty-string    $name         Name of the multi-agent
+     * @param LoggerInterface     $logger       Logger for debugging handoff decisions
      */
     public function __construct(
         private AgentInterface $orchestrator,