feat(open-tasks): archive-done sweep at start of Phase A

open-tasks.org Phase A now runs `emacs --batch -q -l
.ai/scripts/todo-cleanup.el --archive-done todo.org` as a pre-step
before the parallel read batch. A level-2 task that completed during
the session sits as ** DONE under Open Work until something archives
it, which means Next Mode would surface it as a "what's next" candidate
between cleanups. The pre-step ensures Phase A's read of todo.org
reflects current state.

The pre-step skips only in an explicit read-only or dry-run context.
Default is always to sweep.

Common Mistake #13 records "recommending a freshly-DONE task" with the
pointer back to the pre-step.

The proposal came from a pearl handoff on 2026-05-28.

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