style: unify code formatting and import order

- Remove trailing whitespace and normalize blank lines
- Unify string quotes and line breaks for long lines
- Sort imports alphabetically across modules

nanobot/agent/tools/spawn.py

@@ -1,6 +1,6 @@
 """Spawn tool for creating background subagents."""
 
-from typing import Any, TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 from nanobot.agent.tools.base import Tool
 
@@ -10,23 +10,23 @@ if TYPE_CHECKING:
 
 class SpawnTool(Tool):
     """Tool to spawn a subagent for background task execution."""
-    
+
     def __init__(self, manager: "SubagentManager"):
         self._manager = manager
         self._origin_channel = "cli"
         self._origin_chat_id = "direct"
         self._session_key = "cli:direct"
-    
+
     def set_context(self, channel: str, chat_id: str) -> None:
         """Set the origin context for subagent announcements."""
         self._origin_channel = channel
         self._origin_chat_id = chat_id
         self._session_key = f"{channel}:{chat_id}"
-    
+
     @property
     def name(self) -> str:
         return "spawn"
-    
+
     @property
     def description(self) -> str:
         return (
@@ -34,7 +34,7 @@ class SpawnTool(Tool):
             "Use this for complex or time-consuming tasks that can run independently. "
             "The subagent will complete the task and report back when done."
         )
-    
+
     @property
     def parameters(self) -> dict[str, Any]:
         return {
@@ -51,7 +51,7 @@ class SpawnTool(Tool):
             },
             "required": ["task"],
         }
-    
+
     async def execute(self, task: str, label: str | None = None, **kwargs: Any) -> str:
         """Spawn a subagent to execute the given task."""
         return await self._manager.spawn(