Return 200 with empty state instead of 503/404

backend/api/routes/control.py

@@ -20,10 +20,7 @@ async def control_status():
         data = redis.get_json("control:last_tick")
         if data:
             return data
-    raise HTTPException(
-        status_code=503,
-        detail="No tick result available (worker may not have run yet)",
-    )
+    return {"status": "waiting", "message": "Worker has not run yet"}
 
 
 @router.get("/plan")
@@ -41,7 +38,7 @@ async def control_plan():
         with open(DAILY_PLAN_PATH) as f:
             return json.load(f)
     except FileNotFoundError:
-        raise HTTPException(status_code=404, detail="No plan available")
+        return {"status": "waiting", "message": "No plan generated yet", "slots": []}
     except Exception as exc:
         log.error("Failed to load plan from file: %s", exc)
         raise HTTPException(status_code=500, detail="Plan loading failed")
@@ -55,10 +52,7 @@ async def control_budget():
         data = redis.get_json("control:budget")
         if data:
             return data
-    raise HTTPException(
-        status_code=503,
-        detail="No budget data available",
-    )
+    return {"status": "waiting", "message": "No budget computed yet"}
 
 
 _tracker_cache: dict = {"data": None, "expires": 0.0}