Remove redundant or [] in CORS allow_origins

list(tuple()) already returns [], so the or [] fallback never triggers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: SkylarKelty

artemis/main.py

@@ -150,7 +150,7 @@ def _research_preset_config(settings: Settings, preset: str) -> ResearchPresetCo
 
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=list(initial_settings.allowed_origins) or [],
+    allow_origins=list(initial_settings.allowed_origins),
     allow_credentials=False,
     allow_methods=["GET", "POST"],
     allow_headers=["Authorization", "Content-Type"],