Follow-up to the salvaged #116041: the board's `done` column is now newest-
completed-first and `hermes kanban list --sort completed-desc` exists, so the
feature doc and the CLI usage block say so; the stale "per-column ordering
comes from list_tasks" comment in `get_board` now describes the queue
columns only (wording from #116051).
Co-authored-by: MohamadKanso <91088196+MohamadKanso@users.noreply.github.com>