v0.14.5 — remove a dead ephemeral board from the dashboard

Fixed

• A dead ephemeral board can be removed from the dashboard (#23). When a spawned team's member dies (e.g. a host restart), its board card showed All connection attempts failed with no way to clear it — teardown refused (the team was already gone from the registry) and the only recourse was a console reload. Unreachable board cards now carry a Remove (✕) that drops the board from whatever store backs it (spawned team → teardown; remote → unregister; dead local member → stop + purge), idempotently. New POST /api/plugins/portfolio/forget + _forget_board. (#24)