claude-sessions: session registry manager with subcommands:
- list: live tmux sessions + resumable registry entries
- recover: scan profile dirs for sessions active before restart
- spawn/resume: start or resume sessions
- register: called by claude-tmux to auto-populate registry
- gc: prune stale entries and backfill session IDs from .jsonl
- (no args): interactive numbered menu
claude-sessions-shutdown: called by systemd at halt/reboot;
sends /exit-session to each Claude tmux session, waits up to
90s for graceful exit, force-kills stragglers.
Symlinks: ~/sbin/claude-sessions, ~/sbin/claude-sessions-shutdown
