gsd-cleanup

name	gsd-cleanup
description	Implementation of gsd-cleanup command

Archive phase directories from completed milestones into `.planning/milestones/v{X.Y}-phases/`.

Use when .planning/phases/ has accumulated directories from past milestones.

<execution_context> @$HOME/.config/opencode/get-shit-done/workflows/cleanup.md </execution_context>

Follow the cleanup workflow at @$HOME/.config/opencode/get-shit-done/workflows/cleanup.md. Identify completed milestones, show a dry-run summary, and archive on confirmation.