Fix Dockerfile and graders.py: Remove he_demo namespace references

Dockerfile

@@ -79,4 +79,4 @@ HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
 
 # Run the FastAPI server
 # The module path is constructed to work with the /app/env structure
-CMD ["sh", "-c", "cd /app/env && uvicorn he_demo.server.app:app --host 0.0.0.0 --port 8000"]
+CMD ["sh", "-c", "cd /app/env && uvicorn server.app:app --host 0.0.0.0 --port 8000"]

graders.py

@@ -11,7 +11,7 @@ Each grader function evaluates agent performance on a specific task,
 returning a score from 0.0 (worst) to 1.0 (best).
 """
 
-from he_demo.models import EnergyOptimizationObservation
+from models import EnergyOptimizationObservation
 
 
 def grade_basic_ram_reduction(observation: EnergyOptimizationObservation) -> float: