stardust:prepare-migration

Orchestrate the migrate-prep cascade. When the user commits to migrating an existing site, this skill runs the upstream phases (extract, direct, prototype) in their --prep modes, sequenced with confirmation gates so the user can confirm or refine the inferred catalog at each step.

prepare-migration 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:

• skills/extract/SKILL.md § Prep mode
• skills/direct/SKILL.md § Prep mode
• skills/prototype/SKILL.md § Prep mode + reference/canon-extraction.md