auto-closeout

Internal Auto Office closeout spoke for 3.x runs. Use when a run's work is accepted and landed (or ready to hand off) and it is time to run office close: confirm the target run, verify the gate, respect the PR merge boundary, update the docs the repo keeps, sync the local base branch and remove the run's worktrees, close loops including panes, and end with the office close done report line. Never claims success from model confidence alone.