- stopwatch-widget.tsx: start/stop/reset/lap controls, setInterval tick (100ms)
- Reload reconstruction: Date.now() - startedAt + elapsed (Pitfall 2 fix)
- State persisted via updateWidgetConfig(instanceId, {...}) on each action
- Single interval cleared on unmount and when not running (T-08-04 mitigated)
- Lap times stored newest-first per RESEARCH recommendation
- No CSS modules — Tailwind only (grep -c module.css = 0)
- page.tsx: added wireStopwatchWidget(StopwatchWidget) import + call
- All 7 stopwatch tests pass (GREEN)
