The history-digest pipeline (PR #297) injected past-task data but nothing
told the intake agent what to do with it: prompter.md now carries an
explicit don't-re-propose section (cite duplicates by short id, reference
precedent in notes, let history inform depends_on sequencing), and
list_recent_for_project excludes cancelled tasks so dead work can't pose
as precedent.
Co-authored-by: Renn F <rennf93@users.noreply.github.com>
