refactor(core): rename agent_runner/session_buffer/registry to scout_*

app/api/routes/scouts.py

@@ -24,7 +24,7 @@ from pydantic import BaseModel
 
 from app.api.deps import get_current_user
 from app.billing.tier_manager import FEATURES
-from app.core.agent_runner import is_agent_running, run_local_agent
+from app.core.scout_runner import is_agent_running, run_local_agent
 from app.core.device_manager import device_manager
 from app.core.note_summarizer import generate_note_summary
 from app.db import get_session