Issue: Segmentation fault on setWarmStart and missing matrix update functionality in…

Issue: Segmentation fault on setWarmStart and missing matrix update functionality in…: a task in LegoFlow-SWE (Harbor dataset). Expected behavior: - solver.settings() must always return a valid settings object, regardless of whether initSolver() has been called. - Invoking setWarmStart(true) at…

The task

**Expected behavior:** - `solver.settings()` must always return a valid settings object, regardless of whether `initSolver()` has been called. - Invoking `setWarmStart(true)` at any time should not crash. If warm start cannot be applied immediately because necessary internal data is not available, the call should…

Part of Lego-X/LegoFlow-SWE.