stdd-implementlisted

<!-- generated by stdd plugin build v0.9.2 — do not edit --> # Implement Run one narrow vertical slice at a time: 1. Record the docs decision with `stdd docs`. For changed behavior, edit the canonical docs first and record `updated-first`. 2. Add the smallest test that proves the agreed behavior. Run it through `stdd red -- <command>` and confirm the failure is genuine. 3. Implement only enough production code to satisfy that contract. 4. Run the focused and affected verification through `stdd verify -- <command>`. 5. Check `stdd status --local`; a later checkout change makes verification stale and requires another verify. Frontend visual composition follows the method's design-first exception. Behavior embedded in the UI still follows the loop. Do not batch unrelated rules behind one red. If the plan has multiple items, update its checkboxes only after their named evidence exists.