refactor: replace try-except blocks with contextlib.suppress for cleaner error handling across multiple files

nanobot/agent/loop.py

@@ -7,7 +7,7 @@ import dataclasses
 import json
 import os
 import time
-from contextlib import AsyncExitStack, nullcontext
+from contextlib import AsyncExitStack, nullcontext, suppress
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Awaitable, Callable
 
@@ -492,10 +492,8 @@ class AgentLoop:
         tasks = self._active_tasks.pop(key, [])
         cancelled = sum(1 for t in tasks if not t.done() and t.cancel())
         for t in tasks:
-            try:
+            with suppress(asyncio.CancelledError, Exception):
                 await t
-            except (asyncio.CancelledError, Exception):
-                pass
         sub_cancelled = await self.subagents.cancel_by_session(key)
         return cancelled + sub_cancelled