stardust:prepare-migration Orchestrate the migrate-prep cascade. When the user commits to migrating an existing site, this skill runs the upstream phases ( , , ) in their modes, sequenced with confirmation gates so the user can confirm or refine the inferred catalog at each step. is a thin orchestrator — it does not duplicate logic from the underlying skills; it invokes them and brokers the per-phase summaries. The substantive work lives in: - § Prep mode - § Prep mode - § Prep mode + When prep is complete, the user runs separately. The two-step boundary ( then ) is intentional: it makes "I'm…