Fix output paths: all build scripts save to /app/repo/medal-solvers/optimized/

medal-solvers/build_task398_onnx.py

@@ -142,8 +142,8 @@ if __name__ == '__main__':
     print("Building Task 398 ONNX model (fixed)...")
     model = build_task398()
     
-    os.makedirs('/app/optimized', exist_ok=True)
-    output_path = '/app/optimized/task398.onnx'
+    os.makedirs('/app/repo/medal-solvers/optimized', exist_ok=True)
+    output_path = '/app/repo/medal-solvers/optimized/task398.onnx'
     onnx.save(model, output_path)
     
     fsize = os.path.getsize(output_path)