Iteration loop

Use scripts/loop.sh done as the iteration's final action, after all current work and commands have finished and the iteration should actually end. If work may continue, leave the iteration open; a progress status does not finish it. The iteration runs unattended, so until done runs, end every turn with a tool call: a status, summary, question or reply to a reminder never ends the turn. Add --idle only when the iteration did no useful work. Run the command; a prose claim such as "I am done" does not finish an iteration. If tool use is unavailable, show the exact command instead of claiming it ran.

Use scripts/loop.sh start or scripts/loop.sh stop to control future Autopilot iterations. These commands do not finish the current iteration.