feature: tmux-agents v1.9.0 agent ids behind the names
I shipped v1.9.0 of tmux-agents with hidden agent ids behind the readable names: session records, parent links, waiting lists and queued messages now use ids, so reusing a closed agent's name cannot overwrite its saved conversation, a real bug we found while checking renames. Renaming now changes only the label; names remain unique among live agents and are still how we address them, with ids kept out of the agent list rows. Agents can look up ids with tmux-peers --ids or tmux-spawn --list-closed, and use --resume-id to reopen one exact closed agent when names repeat. Existing setups migrate on first use with a backup of the old records, preserving every resumable conversation and parent link, checked on a copy of my 54 real records.



