Core safety workflow for every Legacy Migrator migration pack. Use together with a pack like express-4-to-5, vue-2-to-3, or django-upgrade-52 whenever upgrading a framework, runtime, ORM, or dependency across a major version — "upgrade express", "migrate to django 5.2", "vue 3 migration", "move off EOL framework". Enforces the inventory → risk report → staged plan → human approval gate → mechanical transform → verification → merge-gate state machine with rollback at every stage. If no pack matches the user's migration, use this skill to run the generic workflow and explicitly refuse to improvise pack-specific transforms.
