Use when .planning/phases/ has accumulated directories from past milestones.
</objective>
<execution_context> @{{PLATFORM_ROOT}}/get-shit-done/workflows/cleanup.md </execution_context>
<process> Follow the cleanup workflow at @{{PLATFORM_ROOT}}/get-shit-done/workflows/cleanup.md. Identify completed milestones, show a dry-run summary, and archive on confirmation. </process>