- Move all 8 completed plans (260426-* and 260427-*) into
plans/archive/ to keep the active plans/ dir uncluttered.
- Add plans/todo.md as a hand-off list for next session: highest
leverage items first (auto-tick integration test, CI inline-script
smoke check, PWA install verification), then UX polish queued from
pass-2 reviews, tech-debt items, and a parking-lot of new features.