bunch of experiments;

prototype of line search (cubic splines);
CG without QR seems best;
no other solver converges on hard lasso LP
I am using for testing, good class to develop on

experiments/test_without_hsde.ipynb

@@ -235,7 +235,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.3"
+   "version": "3.11.9"
   }
  },
  "nbformat": 4,