refactor: use cron turn naming internally

tests/agent/test_unified_session.py

@@ -25,9 +25,9 @@ from nanobot.bus.queue import MessageBus
 from nanobot.command.builtin import cmd_new, register_builtin_commands
 from nanobot.command.router import CommandContext, CommandRouter
 from nanobot.config.schema import AgentDefaults, Config
+from nanobot.session.keys import UNIFIED_SESSION_KEY
 from nanobot.session.manager import Session, SessionManager
 
-
 # ---------------------------------------------------------------------------
 # Helpers
 # ---------------------------------------------------------------------------
@@ -39,8 +39,8 @@ def _make_loop(tmp_path: Path, unified_session: bool = False) -> AgentLoop:
     provider.get_default_model.return_value = "test-model"
 
     with patch("nanobot.agent.loop.SessionManager"), \
-         patch("nanobot.agent.loop.SubagentManager") as MockSubMgr:
-        MockSubMgr.return_value.cancel_by_session = AsyncMock(return_value=0)
+         patch("nanobot.agent.loop.SubagentManager") as mock_sub_mgr:
+        mock_sub_mgr.return_value.cancel_by_session = AsyncMock(return_value=0)
         loop = AgentLoop(
             bus=bus,
             provider=provider,
@@ -415,10 +415,8 @@ class TestStopCommandWithUnifiedSession:
     @pytest.mark.asyncio
     async def test_active_tasks_use_effective_key_in_unified_mode(self, tmp_path: Path):
         """When unified_session=True, tasks are stored under UNIFIED_SESSION_KEY."""
-        from nanobot.agent.loop import UNIFIED_SESSION_KEY
-
         loop = _make_loop(tmp_path, unified_session=True)
-        
+
         # Create a message from telegram channel
         msg = _make_msg(channel="telegram", chat_id="123456")
 
@@ -443,7 +441,6 @@ class TestStopCommandWithUnifiedSession:
     @pytest.mark.asyncio
     async def test_stop_command_finds_task_in_unified_mode(self, tmp_path: Path):
         """cmd_stop can cancel tasks when unified_session=True."""
-        from nanobot.agent.loop import UNIFIED_SESSION_KEY
         from nanobot.command.builtin import cmd_stop
 
         loop = _make_loop(tmp_path, unified_session=True)
@@ -476,7 +473,6 @@ class TestStopCommandWithUnifiedSession:
     @pytest.mark.asyncio
     async def test_stop_command_uses_effective_key_without_session_override(self, tmp_path: Path):
         """Priority /stop must cancel the unified session even before dispatch rewrites the message."""
-        from nanobot.agent.loop import UNIFIED_SESSION_KEY
         from nanobot.command.builtin import cmd_stop
 
         loop = _make_loop(tmp_path, unified_session=True)
@@ -502,7 +498,6 @@ class TestStopCommandWithUnifiedSession:
     @pytest.mark.asyncio
     async def test_stop_command_cross_channel_in_unified_mode(self, tmp_path: Path):
         """In unified mode, /stop from one channel cancels tasks from another channel."""
-        from nanobot.agent.loop import UNIFIED_SESSION_KEY
         from nanobot.command.builtin import cmd_stop
 
         loop = _make_loop(tmp_path, unified_session=True)