complete_task works from the stem of the card it is completing, so a
finished phase leaves every member's worktree, local branch and remote
branch in place — measured on 53: three worktrees at 3.8M each and two
member branches still on origin. The sweep now removes them, with the
existing rule intact for a member that never merged: there is work in
that worktree, so it stays.
istos
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