Fix: Update SubAgentManager initialization for new timeout params

Changed from timeout_seconds=300 to use default params (idle=300s, total=900s)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

agent.py

@@ -42,7 +42,7 @@ class Agent:
         # Sub-agent orchestration
         self.is_sub_agent = is_sub_agent
         self.specialist_prompt = specialist_prompt
-        self.sub_agent_manager = SubAgentManager(timeout_seconds=300)  # 5 min timeout
+        self.sub_agent_manager = SubAgentManager()  # Default: 5 min idle, 15 min total
         if not is_sub_agent:
             self.sub_agent_manager.start_watchdog()  # Only main agent runs watchdog
         self.sub_agents: dict = {}  # Cache for spawned sub-agents