fix: register WaitForSubagentsTool in main AgentLoop so it's available in live sessions

Previously wait_for_subagents was only registered inside _run_subagent
(spawned orchestrators). Main conversation agent had no access to it.

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

nanobot/agent/loop.py

@@ -19,6 +19,7 @@ from nanobot.agent.tools.shell import ExecTool
 from nanobot.agent.tools.web import WebSearchTool, WebFetchTool
 from nanobot.agent.tools.message import MessageTool
 from nanobot.agent.tools.spawn import SpawnTool
+from nanobot.agent.tools.wait import WaitForSubagentsTool
 from nanobot.agent.tools.cron import CronTool
 from nanobot.agent.memory import MemoryStore
 from nanobot.agent.subagent import SubagentManager
@@ -109,6 +110,7 @@ class AgentLoop:
         # Spawn tool (for subagents)
         spawn_tool = SpawnTool(manager=self.subagents)
         self.tools.register(spawn_tool)
+        self.tools.register(WaitForSubagentsTool(manager=self.subagents))
         
         # Cron tool (for scheduling)
         if self.cron_service: