e401221d — read-only: worktree rows still marked active in the DB whose owning sprint item/session has reached a terminal state (see db.list_worktrees_pending_cleanup, a03c0eeb), i.e. "dead" worktrees.

Non-destructive — unlike POST /worktrees/sweep this never touches disk or the DB; it just exposes the same candidate list so a CLIENT-SIDE hook (the e401221d orphan-process reaper, meridian/orphan_reaper.py) can cross-reference locally running pixi/python/node processes against these paths and reap the ones rooted in a dead worktree. Exposed on both self-hosted and hosted deployments (unlike the sweep endpoint) since it performs no filesystem access itself — only the caller's own local hook process touches the caller's machine.