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

medal-solvers/build_task285_scatter.py

@@ -306,7 +306,7 @@ if __name__ == '__main__':
                        help='Path to official neurogolf_utils.py')
     parser.add_argument('--task-data-dir', default='../task-data',
                        help='Directory containing taskNNN.json files (from neurogolf-2026.zip)')
-    parser.add_argument('--output', default='optimized/task285.onnx',
+    parser.add_argument('--output', default='/app/repo/medal-solvers/optimized/task285.onnx',
                        help='Output path for the optimized model')
     parser.add_argument('--skip-official-validation', action='store_true',
                        help='Skip official utils validation (NOT recommended)')