Reusable script to fully unregister chat room(s) and purge all managed data
while keeping ONLY the chats channel row and messages history. Removes room
registration, paired tasks/turns/attempts/outputs/reservations/leases/
projects/handoffs, work items, scheduled tasks, sessions, router cursor, and
the on-disk group/workspace/session/ipc folders (git worktrees removed
cleanly). Supports --dry-run, refuses main rooms without --force, and skips
disk deletion for group folders still shared by another room.
Backs the "채팅 등록 해제" standing workflow (unregister + purge + restart).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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